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101Author    Oligophosphine Ligands, Xxxiv, Lutz DahlenburgRequires cookie*
 Title    Oligophosphan-Liganden, XXXIV** Organoplatin(II)-Komplexe mit (+ )-(l *S)-l,2-Bis(diphenylphosphino)- 1 -phenylethan-Koordination  
 Abstract    O rganoplatinum (II) Complexes with (+)-(1 5)-1,2-Bis(diphenylphosphino)-1-phenylethane Coordination A ndrea Saare Reaction o f (C8H 12)P t(C H 2C M e3)2 with (+)-(l S)-Ph2P CH (Ph)C H 2P Ph2, S-PHEPHO S, gave (5'-PH EPH O S)Pt(C H2C M e3)2 (1). Cleavage o f one o f the P t -C bonds o f this com pound with m ethanolic HC1 yielded (5-PH EPH O S)PtC l(CH 2C M e3) (2) which could be converted to (5-PH EPH O S)PtH (C H 2C M e3) (3) by treatment with N a[H B (O M e)3], The com plexes so ob­ tained were characterized by N M R spectroscopy (preferentially 31P) as well as by an X-ray structure analysis performed on the dineopentyl derivative 1. While thermal generation o f (S'-PHEPHOS)Pt(O) from 3 in the presence o f H C = C C (0)0 C M e 3 produced the alkyne co­ 
  Reference    Z. Naturforsch. 47b, 247 (1992); eingegangen am 24. Juli 1991 
  Published    1992 
  Keywords    Chiral Bis(phosphine) Ligand, Platinum Complexes, X -Ray, Thermolysis 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0247.pdf 
 Identifier    ZNB-1992-47b-0247 
 Volume    47 
102Author    ThomasD. Smith, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    The Role of Elimination Processes in the Reaction of Substituted Ureas and Thioureas with Chlorides of Mono-and Bifunctional Acids  
  Reference    Z. Naturforsch. 47b, 526—532 (1992); received August 29 1991 
  Published    1992 
  Keywords    Reactive Halides, Substituted Ureas, Elimination Reactions, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0526.pdf 
 Identifier    ZNB-1992-47b-0526 
 Volume    47 
103Author    Andreas Ansorge, DavidJ. Brauer, Hans Bürger, F. Rank Dörrenbach, Burkhard Krum, G. Ottfried PawelkeRequires cookie*
 Title    Complexes of (CF3)3B with Sterically Crowded Amines. Unexpected Side Products from the Trifluoromethylation of Cl2BN(f-Bu)(Bz). Crystal and Molecular Structures of (CF3)3BN H(CH 2)6, H O (CF3)2BCH(Ph)NH(f-Bu)(Bz) and Ph(CF3)2BCHN(f-Bu)(Bz)  
 Abstract    Trifluoromethylation o f C12B N (C H 2)6, Cl2B(tmp), tmp = 2,2,6,6-tetramethylpiperidino, and CLBN(r-Bu)(Bz) with three equivalents o f C F3Br/P(NEt2)3 yields the amine complexes (C F 3)3B N H (C H 2)6 (1), (C F 3)3B • N H 2CM e2(CH 2)2CH C M e2 (2) and (C F 3)3B N H 2(Bz) (3). The preparation o f 3 was accompanied by formation o f three unexpected trifluoro-methylboron derivatives X (C F 3)2BCH(Ph)NH(r-Bu)(Bz) (D), X = Br (4), Cl (5), and (Ph)(C F3)2BCH N(/-Bu)(Bz) (6), the latter being formed from 4 by HBr elim ination and rear­ rangement. Reaction o f 4 with H 20 , EtOH, H C O N M e2 and M e3SnH yielded D, X = OH (7), EtO (8), HCOO (9), and (Ph)(CF3)2BCH2N H (/-Bu)(Bz) (10), respectively. The structures o f 1, 6 and 7 have been determined by X-ray diffraction analysis. 
  Reference    Z. Naturforsch. 47b, 772—7 (1992); received November 6 1991 
  Published    1992 
  Keywords    Trifluoromethylation, Borane-Amine Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0772.pdf 
 Identifier    ZNB-1992-47b-0772 
 Volume    47 
104Author    Dieter Sellmann+, MarcusH. Annakam, Falk Knoch, M. Atthias, MollRequires cookie*
 Title    Übergangsmetallkomplexe mit Schwefelliganden, XCII*. Oxidation von Thiolat-Amin-zu Schiffbase-Eisen(II)  
 Abstract    Komplexen. Röntgenstrukturanalyse und Reaktivität von [Fe('N2S2')]2 (N2S2'2" = Glyoxal-bis(2 -mercaptoanil)(2 -)) Transition M etal Complexes with Sulfur Ligands, XCII*. Oxidation o f Thiolate Amine to Schiff Base Iron(II) Complexes. X-Ray Structure Analysis and Reactivity of [Fe('N2S2')]2 ('N 2S2'2_ = Glyoxal-bis(2-mercaptoanil)(2-)) Oxidation o f [Fe(CO)2('N 2H2S2')] (1) ('N 2H2S2'2_ = l,2-ethanediam ine-N ,N '-bis(2-benzene-thiolate)(2—)) gave insoluble [Fe('N2S2')]2 (2) ('N2S2'2_ = glyoxal-bis(2-m ercaptoanil)(2-)). Dinuclear, thiolato-bridged 2 was characterized by single crystal X-ray structure analysis. It does not react with CO or H 2, but yields bis or mono adducts with PR 3 (R = M e, rc-Bu, Cy). 
  Reference    Z. Naturforsch. 47b, 1545—1550 (1992); eingegangen am 17. April 1992 
  Published    1992 
  Keywords    Thiolate Am ine, Iron(II) Complexes, Oxidation, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1545.pdf 
 Identifier    ZNB-1992-47b-1545 
 Volume    47 
105Author    RostislavD. Lampeka, Zam Ira, D. Uzakbergenova, VictorV. SkopenkoRequires cookie*
 Title    Spectroscopic and X-Ray Investigation of Cobalt(III) Complexes with 2-Oximinocarboxylic Acids  
 Abstract    Mixed complexes of Co(III) with 2-oximinopropionic (H 2A) or 2-oximino-3-phenylpropionic (H 2B) acid and different amine (imidazole, benzimidazole, pyridine, yS-picoline, y-picoline) are reported. Characterization of the complexes was based upon ele­ mental analysis, conductivity and JR, 'H N M R, and electronic absorption spectra, and X-ray diffraction analysis. The organic ligands behave as 0 ,N donors via the carboxyl oxygen and the oxime nitrogen atoms. A trans-octahedral structure has been assigned to the bis(2-oximino-carboxylato)bis(am ine)cobalt(III) on the basis of 'H N M R data. The crystal and molecular structures of the complexes rra«5-[bis(2-oximinopropionato)bis-(imidazole)]-(I) and ^ • a«5'-[bis(2-oximinopropionato)bis(pyridine)]cobalt(III) (II) were deter­ mined. I crystallizes in space group P 2/« with a = 14.167(2), b = 8.774(_1), c = 14.785(2)Ä, ß = 113.37(1)°, Z = 4, Dca)c = 1.568 g e m '3. II crystallizes in space group P 1 with a = 9.122(2), b = 10.038(2), c = 11.759(2) A, a = 69.95(1)°, ß = 67.47(2)°, y = 69.49(2)°, Z = 2, Dcalc = 1.547 g-cm~3. The structures were refined to unweighted R factors of 0.036 and 0.028, respec­ tively. The coordination sphere around Co is pseudo-octahedral with the 2-oxim inopropionato ligands occupying four equatorial positions, and the amines in axial po­ sitions. 
  Reference    Z. Naturforsch. 48b, 409—417 (1993); received November 2 1992 
  Published    1993 
  Keywords    Cobalt, Oximiocarboxylic Acid, Amine, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0409.pdf 
 Identifier    ZNB-1993-48b-0409 
 Volume    48 
106Author    JohannK. Lessmann, Helmut Rupa, Lackner, Karen Schmidt-Bäse, GeorgeM. SheldrickRequires cookie*
 Title    Holger  
 Abstract    The isolation o f Juglorubin (2) from cultures o f Streptomyces spp., which produce a series o f other hydroxynaphthoquinones, is described. 2 is a unique, unusually condensed ionic color­ 
  Reference    Z. Naturforsch. 48b, 672 (1993); eingegangen am 21. Dezember 1992 
  Published    1993 
  Keywords    Antibiotics, Juglomycins, X -Ray, N M R Spectra 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0672.pdf 
 Identifier    ZNB-1993-48b-0672 
 Volume    48 
107Author    ThomasG. Meyer, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    Darstellung neuer Monofluorphosphine und einiger ihrer Übergangsmetallkomplexe; Einkristall-Röntgenstrukturanalyse eines Platin(II)-Komplexes Preparation of New M onofluorophosphines and Some o f their Transition Metal Complexes; Single Crystal X-Ray Diffraction Study o f a Platinum (II) Complex  
 Abstract    The reaction of lithiated precursors with PC12F led to a num ber of monofluorophosphines, including the known di-/e>7-butylmonofluorophosphine, 1. Bis(phenylethinyl)monofluoro-phosphine (2) was accessible only via this route (the classical method of synthesizing 2 by chlorine/fluorine exchange is impossible, because the corresponding chlorophosphine is un­ known). Bis(2-methoxyphenyl)fluorophosphine (5) was prepared via the organolithium /PCl2F route. The N M R results for 5 thus prepared were inconsistent with previous reports, implying that the previously reported synthesis o f 5 is in error. From 5 a m -dichloroplatinum (II) com­ plex (6) was synthesized and subjected to a single crystal X-ray structure analysis, confirming the expected planar coordination. From bis(2,3-dimethoxynaphthyl)monofluoro-phosphine (7) a rhodium(I) (8) and an iron(0)tetracarbonyl complex (9) were prepared. An iron(0)tetracarbonyl complex (11) was synthesized from bis(9-anthryl)monofluorophosphine (10) which was found to be stable to redox disproportionation. 
  Reference    Z. Naturforsch. 48b, 875—885 (1993); eingegangen am 16. Februar 1993 
  Published    1993 
  Keywords    Dichlorofluorophosphine, M onofluorophosphines, Transition Metal Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0875.pdf 
 Identifier    ZNB-1993-48b-0875 
 Volume    48 
108Author    Vadim Pavlenko, Vladimir Kokozay, Olga BabichRequires cookie*
 Title    Direct Synthesis of Tetranuclear Complexes of Copper(II) with /i4-Bridging Oxygen  
 Abstract    The direct synthesis of a num ber complexes with general composition Cu4OCl6 «(CH 3)2NH-raSolv, where n = 4, m = 0 -2 and Solv = C H 3OH, DMSO, is reported. It is shown by X-ray structure investigation, that in Cu4OCl6-4 (C H 3)2N H the copper atoms are linked by //4-oxygen and //2-chlorine bridging atoms, while molecules of (CH3)2NH are at­ tached to the metal atoms via nitrogen ones. 
  Reference    Z. Naturforsch. 48b, 1321—1324 (1993); received April 22 1993 
  Published    1993 
  Keywords    Direct Synthesis, Copper(II) Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1321.pdf 
 Identifier    ZNB-1993-48b-1321 
 Volume    48 
109Author    Dieter Seilmann, Helge Friedrich, Falk KnochRequires cookie*
 Title    Transition Metal Complexes with Sulfur Ligands, XCIX  
 Abstract    Form ation and Structure of [Fe('S4')]4. A Rem arkable Tetram erization of Homochiral [Fe('S4')] Complex Fragments ('S4'2-= l,2-Bis(2-m ercaptophenylthio)ethane(2-)) In MeOH/THF solution, Fe(II) ions and the tetradentate thioether-thiolate 'S4'2"([l,2-Bis(2-mercaptophenylthio)ethane(2-)]) slowly form the tetrameric [Fe('S4')]4 1. The crystal structure of 1 THF -2MeOH was determined by X-ray structure analysis. Chiral 1 crystallizes as a pair of enantiomers each of which consist of four homochiral [Fe('S4')] fragments bridged via /i2-and //3-S(thiolato) donors; stereochemical aspects o f the enantiospecific tetramerization of [Fe('S4')] fragments are discussed. In strong polar solvents such as dimethylformamide, dis­ sociation of [Fe('S4')]4 into [Fe('S4')]2 fragments is indicated by the formation o f [Fe(CO)('S4')]2 upon reaction with CO. 
  Reference    Z. Naturforsch. 48b, 1675—1680 (1993); eingegangen am 9. Juli 1993 
  Published    1993 
  Keywords    Iron Sulfur Complex, Chirality, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1675.pdf 
 Identifier    ZNB-1993-48b-1675 
 Volume    48 
110Author    Herrn Prof, Dr, J. Otto, SchererRequires cookie*
 Title    Übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XIX [1]  
 Abstract    Synthese und Strukturbestimmung von l-Metallo-l,2-dihydrophospheten (jj5-C5Me5XCO)2M -P C H (E)-C (E)= C -NMe2 (M = Fe, Ru; E = C 0 2Me, CN) Transition Metal Substituted Acylphosphanes and Phosphaalkenes, XIX [1] Synthesis and Structure Determ ination of l-M etallo-l,2-dihydrophosphetes (^5-C5M e5)(CO)2M -P C H (E)-C (E) = C -N M e 2 (M = Fe, Ru; E = C 0 2 Me, CN) L othar Weber* 3, O laf Kam inski3, H ans-Georg Stammler3, Beate Neumann3, Vadim D. R om anenkob The metallo-phosphaalkenes (/75-C5Me5)(CO)2M -P = C (N R 2)2 (4a,b, 5) result from the reac­ tion of the corresponding bromo compounds (/75-C5Me5)(CO)2MBr with Me3Si-P = C (N R 2)2. The complexes 4a and 5a are cleanly converted into the l-metallo-l,2-dihydrophosphetes (//5-C5Me5)(CO)2M -PCH(E)-C(E) = C -NM e2 (lO a -c) (M = Fe, Ru; E = C 0 2Me, CN) by treatment with equimolar amounts of dimethyl fumarate or fumarodinitrile, respectively. The products 4a,b, 5 and lO a -c have been characterized by elemental analysis as well as by spec­ troscopic data (IR, 'H, 13C, 3IP NM R, MS). The molecular structures o f 4a and 10a have been determined by single crystal X-ray analysis. 
  Reference    Z. Naturforsch. 48b, 1784—1794 (1993); eingegangen am 23. Juni 1993 
  Published    1993 
  Keywords    Phosphaalkenes, Metallo-l, 2-dihydrophosphetes, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1784.pdf 
 Identifier    ZNB-1993-48b-1784 
 Volume    48 
111Author    W. Olfgang Eikens, P. Eter, G. Jones, Jü Rg, L. Au Tn Er, C. Arsten, ThöneRequires cookie*
 Title    Complexes of Copper, Silver, and Gold with Urea Homologues. Crystal Structures of I{/i2-SeC(NH2)2} Ag{SeC(NH2)2}2]22+2 Cl~ * 4 DMF and [Ph3PAu{SC(NHMe)2}]+Cl" * SC(NHMe)2  
 Abstract    The title compounds were prepared from chloro(organophosphine)metal(I) complexes and the urea homologues SeC(NH2)2 and SC(NHMe)2 in good yields. Recrystallization of [Ph,PAg{SeC(NH2)2}]+C r from D M F/C H 2C12 leads in low yield to the dinuclear complex [{/r-SeC(NH2)2}Ag{SeC(NH2)2}2]22+2 C r-4 D M F . The crystal structure reveals short A g-A g contacts and unexpectedly acute angles at the bridging selenium atom. The crystal structure of [Ph3PAu{SC(NHMe)2}]+Cl_ • SC(NHMe)2 shows short N --C1 and N -S con­ tacts that probably correspond to hydrogen bonding. 
  Reference    (Z. Naturforsch. 49b, 21—26 [1994]; received August 12 1993) 
  Published    1994 
  Keywords    Coinage Metal Complexes, X-Ray, Urea Homologues 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0021.pdf 
 Identifier    ZNB-1994-49b-0021 
 Volume    49 
112Author    Dieter Sellmann+, Helge Friedrich, Falk Knoch, Matthias MollRequires cookie*
 Title    Übergangsmetallkomplexe mit Schwefelliganden, C*. Unerwartet einfache Bildung von Diazen-Komplexen und ein neuer Typ von Diastereomerie: [/#-N2H2{Fe(PPr3)('S4')}2] und analoge Komplexe mit [FeS]-Zentren. ( 'S /2-= l,2-Bis(2-mercaptophenylthio)ethan(2-)) Transition Metal Complexes with Sulfur Ligands, C*. Unexpectedly Facile Formation of Diazene Complexes and a New Type of Diastereomerism: [a-N2H2{Fe(PPr3)('S4')}2] and Analogous Complexes with [FeS]-Centers. ('S4'2~ = l,2-Bis(2-mercaptophenylthio)ethane(2-))  
 Abstract    Single pot reactions of FeCl2-4H20 with the tetradentate thioether-thiol 'S4-H 2' = 1,2-bis(2-mercaptophenylthio)ethane, phosphines such as PEt3, PPr3 or PBu3, and a ca. 40-fold excess of N2H4-H20 yield, in the presence of air, diazene complexes of the general formula [M-N2H2{Fe(PR3)('S4')}2]. In contrast to previous syntheses of diazene complexes, the yields can excel 80%, and the syntheses can be carried out on a 10 g scale. [M-N2H2{Fe(PPr3)('S4')}2], 1 and [M-N2H2{Fe(PEt3)('buS4')}2], 2 were characterized by X-ray structure analysis. 2 contains 'buS4'2-= l,2-bis(3,5-ditertiarybutyl-2-mercaptophenylthio)-ethane(2-), which is the tertiary-butyl derivative of 'S4'2-. 1 and 2 contain fram-HN=NH which bridges enantiomeric [Fe(PPr3)('S4')] or [Fe(PEt3)('buS4')] fragments. HN=NH is stabilized by 4c -6 e~-jr bonds, strong tricentric N -H — (S)2 bridges, and steric shielding. NMR studies show that centrosymmetric 1 isomerizes in solution at temperatures around 0 °C in order to give a diastereomerie diazene complex which is also centrosymmetric. The diastereomerism is traced back to bridging the chiral [Fe(PPr3)('S4')] fragments by frara-HN=NH in a differ­ ent way. The two different bridging modes are verified by X-ray structure analyses of analo­ gous ruthenium complexes. Because this new type of diastereomerism is basically caused by a different position only of the N -H — (S)2 bridges, it is termed hydrogen bridge diastereo­ merism. A mechanism for the isomerization is suggested. 1 exhibits three anodic waves in the cyclovoltammogram. The second wave indicates formation of the dication [1]2+, which is a redox isomer of the diprotonated (and as yet hypothetical) dinitrogen complex [a-N2{Fe(PPr3)('S4')}2]. The significance of [1]2+ and of its Lewis basic thiolate donors with respect to electrochemical reduction of molecular dinitrogen under mild conditions is dis­ cussed. 
  Reference    (Z. Naturforsch. 49b, 76—88 [1994]; eingegangen am 9. Juli 1993) 
  Published    1994 
  Keywords    Diazene, Iron Sulfur Complexes, Synthesis, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0076.pdf 
 Identifier    ZNB-1994-49b-0076 
 Volume    49 
113Author    Ulrich Behrens3, ReinhardH. Oppenheitb+, Wilhelm Isenbergb, Enno Lorka, Jan Petersen3, Rüdiger MewsRequires cookie*
 Title    Thiazyltrifluorid-Komplexe von Mg und Zn Thiazyltrifluoride Complexes of Mg and Zn  
 Abstract    The preparations of [Mg(NSF3)4](AsF6)2 (2a) and [Zn(NSF3)4](AsF6)2 (2b) are reported. The structure of 2 b was determined by X-ray diffraction. The ligand properties of NSF3 are discussed. 
  Reference    Z. Naturforsch. 49b, 238—242 (1994); eingegangen am 11. Oktober 1993 
  Published    1994 
  Keywords    Thiazyltrifluoride, X-Ray, Magnesium Complexes, Zinc Complexes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0238.pdf 
 Identifier    ZNB-1994-49b-0238 
 Volume    49 
114Author    Dieter Sellm, Helge Friedrich, Falk KnochRequires cookie*
 Title    Synthese und Struktur von *1,33N2H4 Transition Metal Com plexes with Sulfur Ligands, Cl*. Synthesis and Structure of N 2H 5[Fe(N 2H4)(S2C6H4)2] * 1,33 N 2H 4  
 Abstract    A ttem pts to coordinate N2H4 to [Fe(S2C6H 4)2] fragments lead to N2H 5[Fe(N2H 4)(S2C6H4)2], which crystallizes from M eOH/N2H 4 solutions as the solvate [(N2H 5){Fe(N2H4)(S2C6H4)2} T.33 N2H 4], 1, and has been characterized by X-ray structure analysis. 1 contains three discrete N2H 5+ cations, four N2H4 solvate molecules and three independent [Fe(N2H4)(S2C6H4)2] anions which are connected via an extended network of N -H —N and N -H —S bridges. N2H 5[Fe(N2H 4)(S2C6H4)2] and 1 contain high-spin Fe(III) centers and labile N2H4 ligands. Ubergangsmetallkomplexe mit Schwefelliganden, CI*. 
  Reference    Z. Naturforsch. 49b, 660—664 (1994); eingegangen am 22. Dezember 1993 
  Published    1994 
  Keywords    Iron Sulfur Hydrazine Complexes, Synthesis, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0660.pdf 
 Identifier    ZNB-1994-49b-0660 
 Volume    49 
115Author    D. Ieter Sellmann, Thomas Hofmann, Falk KnochRequires cookie*
 Title    Ni(II)-und Ni(III)-Komplexe mit dem fünfzähnigen Thioether- Thiolat-Amin-Liganden 'NMeS4'2_ ('NMeS4'2_ = Dianion von 2,2'-Bis(2-mercaptophenylthio)diethylmethylamin) Transition Metal Complexes with Sulfur Ligands, CV* Ni(II) and Ni(III) Complexes with the Pentadentate Thioether- Thiolate-Amine-Ligand 'N MeS4'2_ ('N MeS4'2-= Dianion of 2.2'-Bis(2-m ercaptophenylthio)diethylmethylamine)  
 Abstract    Paramagnetic [N i('N MeS4')]2 1 ('N MeS4'2_ = 2.2'-Bis(2-m ercaptophenylthio)diethylm ethyl-a m in e(2 -)) was synthesized from N i(ac)2 and N a2-'N MeS4' and characterized by X-ray structure analysis. In solid state, 1 contains two pseudo-octahedral [N i('N MeS4')] fragments bridged via thiolate donors. In contrast to the parent com plex [N i('N HS4')]2, the thiolate and thioether donors coordinate cis to the Ni center forming m eso [N i('N MeS4')] fragments of Cs symmetry. 1 readily dissociates in solution to give mononuclear [N i('N MeS4')]. Reaction of [N i('N MeS4')]2 1 with PM e3 yielded [N i(PM e3)('N MeS4')] 2, oxidation by io­ dine gave the Ni(III) complex [N i(I)('N MeS4')] 3. Ubergangsmetallkomplexe mit Schwefel-Liganden, CY* 
  Reference    Z. Naturforsch. 49b, 821 (1994); eingegangen am 15. Februar 1994 
  Published    1994 
  Keywords    Nickel Complexes, Thioether-Thiolate-Amine-Ligands, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0821.pdf 
 Identifier    ZNB-1994-49b-0821 
 Volume    49 
116Author    E. Ndre Kövári, Roland KrämerRequires cookie*
 Title    Metallkomplexe 6,6'-Dialkinyl-substituierter 2,2'-Bipyridin  
 Abstract    Liganden: Synthese und Struktur von [{6,6'-(CH3CH2CH2C = C)2bpy}Cu(Cl)(^-Cl)]2 Metal Complexes of 6 ,6 '-Dialkynyl-Substituted 2,2'-Bipyridine Ligands: Synthesis and Structure of [{6 ,6 '-(C H 3 CH2CH2C = C)2bpy}Cu(Cl)(a-Cl)] 2 The bipyridyldiacetylene 6,6'-(C H 3CH2CH2C = C)2bpy (1) was prepared by palladium catalyzed C -C -cou p lin g reaction of 6,6'-dibromo-2,2'-bipyridine with pentyne. Reaction of 1 with anhydrous CuCl2 in acetonitrile gave the dimeric, chloro-bridged complex (1)C u(C1)(m-C1)2Cu(C1)(1) (2), which was characterized by X-ray crystallography. The copper atoms in 2 are square-pyramidally coordinated with normal in-plane C u -N and C u -C l bond distances and one longer, apical bond to the second bipyridyl nitrogen atom. The influence of steric hindrance o f the bipyridyl 6,6'-substituents on the structure o f the complex is discussed. 
  Reference    Z. Naturforsch. 49b, 1324—1328 (1994); eingegangen am 9. Mai 1994 
  Published    1994 
  Keywords    Copper Bipyridine Complexes, Bipyridylacetylenes, X-Ray 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1324.pdf 
 Identifier    ZNB-1994-49b-1324 
 Volume    49 
117Author    N. Orbert Kuhn3, Hans Bohnen3, GeraldH. EnkelbRequires cookie*
 Title    Zur Reaktion von Carben-Addukten des Kohlenstoffdisulfids mit Brom und Iod [1] On the Reaction of Carbene Adducts of Carbon Disulfide with Bromine and Iodine [1]  
 Abstract    The carbene adducts 3 are obtained as stable solids from the im idazol-2-ylidenes 1 and CS2. 3 c reacts with bromine to give the cationic bromosulfane 4, whereas iodine forms the charge-transfer adduct 5. Oxidative coupling to the dicationic disulfane 6 is observed with excess of iodine. The X-ray structure analyses of 3b, 4, 5 and 6 are reported. 
  Reference    Z. Naturforsch. 49b, 1473—1480 (1994); eingegangen am 7. Juli 1994 
  Published    1994 
  Keywords    Carbene Adducts, X-Ray, Iodine Reaction, Bromine Reaction 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1473.pdf 
 Identifier    ZNB-1994-49b-1473 
 Volume    49 
118Author    Bernd Wrackmeyer, Udo Dörfler, Wolfgang Milius, Max HerberholdRequires cookie*
 Title    Triferrocenylborane -Molecular Structure in Solution and in the Solid State  
 Abstract    According to a single crystal X-ray structure determination all three ferrocenyl substituents of triferrocenylborane (1) adopt the same orientation with respect to the BC3-plane [P 2 Jc\ monoclinic; Z = 4; a = 1353.5(3), b = 1695.6(3), c = 1056.4(2) pm, ß = 109.27(3)°]. The simu­ lated X-ray powder pattern of the single crystal is identical with the powder diagram o f a macroscopic sample, indicating the presence of a single diastereomer (l a) in the solid state. How ever, at low temperature (< -9 5 °C) in solution, the 13C NM R spectra suggest the pres­ ence of the second diastereomer (lb) in which one ferrocenyl group is oriented opposite to the other two with respect to the central BC3-plane. 
  Reference    Z. Naturforsch. 50b, 201—2 (1995); received July 25 1994 
  Published    1995 
  Keywords    Triferrocenylborane, 13C NMR Spectra, Dynamic Processes, X-Ray 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0201.pdf 
 Identifier    ZNB-1995-50b-0201 
 Volume    50 
119Author    Thomas Schmidt, Stephan Neis, Richard GoddardRequires cookie*
 Title    Synthesis, Structure, and Properties of Homoleptic l-Oxa-l,3-diene Molybdenum and Tungsten Complexes  
 Abstract    Homoleptic tris(l-oxa-l,3-diene)m olybdenum and tungsten complexes are formed as yel­ low, crystalline compounds in 54-80% isolated yield on treatm ent of the corresponding /3-unsubstituted a,/3-unsaturated ketones with W (CO)3(CH 3CH 2CN)3 or (y6-C6H 6)M o(CO)3 in refluxing hexane. Reaction of these oxadienes with (^6-C6H 5CH3)2Mo in tetrahydrofuran or /7-hexane provides a new high yield route to homoleptic molybdenum complexes that are otherwise difficult to prepare. X-ray crystal structure analyses of two air-stable, isomeric tungsten complexes reveal a significant contribution of a cr2,?/2-bonding mode in the coordi­ nated oxadiene moieties. U nder reaction conditions that allow the platinum catalyzed hydro­ genation of phenyl substituents in these ligands, the coordinated oxadiene fragments are inert, thus demonstrating an unprecedented chemoselectivity in the hydrogenation of aryl-substituted enones. On the other hand, the complexes are labile enough to catalyze the cyclotrimerization of alkynes such as methyl propiolate. 
  Reference    Z. Naturforsch. 50b, 315—325 (1995); received September 7 1994 
  Published    1995 
  Keywords    Oxadiene Complex, Molybdenum, Tungsten, X-Ray, Selective Hydrogenation 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0315.pdf 
 Identifier    ZNB-1995-50b-0315 
 Volume    50 
120Author    B. Gabor, R. Goddard, S. Holle, P. W. Jolly, C. Krüger, R. Mynott, W. WisniewskiRequires cookie*
 Title    T h e R eaction o f D ien es with [F e (P r z2P ( C H 2) /IP P r /2) ] Species  
 Abstract    D ed ica ted to Prof. D r. Dr. h.c. m u lt G ü n th e r W ilk e o n the o cca sio n o f his 70th birthday The structure of the compounds formed upon reacting Fe(Pr'2P(C H 2)"PPr'2)Cl2 (n = 1-3) and active-Mg with acyclic and cyclic 1,3-, 1,4-and 1,5-dienes depends upon the nature of the diene and upon the length of the methylene-chain bridging the two P-atoms of the biden-tate ligand. For example, isoprene reacts to give either (774-isoprene)2FePPr'2C2H4PPr'2 or (^4-isoprene)Fe(Pr'2PC3H6PPr'2) while the products of the reaction with 1,5-hexadiene are (?75-l-methylpentadienyl)Fe(Pr'2PC2H 4PPr'2)H or (//2,?/2-l,5-hexadiene)Fe(Pr'2PC3H6PPr'2). The crystal structures of the last two compounds have been established by X-ray diffraction. The penultimate species catalyses the linear dimerization of 1,5-hexadiene. 
  Reference    Z. Naturforsch. 50b, 503—513 (1995); received September 15 1994 
  Published    1995 
  Keywords    Iron-Organo Complex, Diene Pentadienyl, X-Ray 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0503.pdf 
 Identifier    ZNB-1995-50b-0503 
 Volume    50 
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