Go toArchive
Browse byFacets
Bookbag ( 0 )
Facet   section ZfN Section B:Volume 047  [X]
Results  290 Items
Sorted by   
Publication Year
1992 (290)
61Author    G. Küche3, J. K. Öhler3, W. BauhoferbRequires cookie*
 Title    Röntgenographische, elektrische und spektroskopische Untersuchungen an den Palladiumchalkogeniden P d S ^ S e * Roentgenographic, Electrical and Spectroscopic Investigations of the Palladium Chalcogenides P d S ^ S e  
 Abstract    Silvery reflecting melting cakes o f P d S ^ S e * (0.0 < jc < 1.0) have been prepared by annealing mixtures o f Pd, S and Se at 873 K in evacuated quartz tubes. The PdS-type mixed crystals are stable only in the ranges 0.0 < .x < 0.2 and 0.9 < x < 1.0, whereas a new phase appears in the intermediate region. The new phase P dS|_vSev (0.2 < x < 0.9) crystallizes in the space group P 42/m bc and Z = 24. Lattice constants are a = 1126.2(7), c = 683.2(7) pm (PdS0 6Se04) and a = 1130.8(9), c = 685.4(8) pm (PdS04Se0 6). The relationships between the new structure type and the PtS and PdS structure types are discussed. The infrared reflection spectra o f polycrystalline samples o f PdS were measured between 10 and 300 K in the frequency range from 30 to 400 cm -1. Both phonons and plasmons contrib­ ute to the spectra. The temperature dependence o f the plasmon contribution shows an unusual behaviour which is explained by the assumption o f a phonon assisted hopping conductivity mechanism at low temperatures and a Drude-like transport at high temperatures. The normal mode which may be involved in the hopping process is proposed from a normal coordinate calculation using a three-parameter short range valence force field model. The electrical trans­ port data are in general agreement with the optical ones. The infrared spectra o f the mixed crystals P d S ^ S e,. (0.2 < x < 1) are discussed. 
  Reference    Z. Naturforsch. 47b, 383—3 (1992); eingegangen am 31. Juli 1991 
  Published    1992 
  Keywords    Palladium Sulfide, Palladium Selenide, Far-Infrared Reflection Spectra, Electrical Properties, Hopping Conductivity 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0383.pdf 
 Identifier    ZNB-1992-47b-0383 
 Volume    47 
62Author    Fausto Calderazzo, Guido Pam, M. Artin Sperrlea, Ulli EnglertbRequires cookie*
 Title    Electron-and Ligand-Transfer Reactions Involving N,N-Dialkylcarbamates. Synthesis and Molecular Structure of V jIf^ -C C sH ^ yC ^ C N t^ H ^ h  
 Abstract    Electron-and ligand-transfer reactions o f low-valent organom etallic com pounds o f titanium and vanadium with N,N-dialkylcarbam ates o f titanium(IV) are reported. The reaction o f VCp2 (Cp = ^-cyclopentadienyl) with T i(0 2C N E t2)4 affords, inter alia, the dimeric vana-dium(III) N ,N-diethylcarbam ato derivative V2Cp2(0 2C N E t2)4 which has been studied by X-ray diffraction methods. Crystal data; triclinic, space group P i; a = 10.802(2), b = 11.004(1), c = 8.960(1) Ä; a = 112.879(9), ß = 102.66(1), y = 102.42(1)°; V = 902.3(6) A 3; Z = 1; F(000) = 368, gcalc = 1.282 g em -3; n = 5.47 cm -1. It consists o f a centrosymmetric dimer, the two vanadium atom s being surrounded by four oxygen atom s o f the bridging N,N-diethylcar-bamato groups and by the cyclopentadienyl ligand. The metal atom exhibits a distorted square-pyramidal coordination geometry with the oxygen atom s occupying the basal plane. The reaction o f TiCp2(CO)2 or Vmes2 (mes = //6-l,3 ,5 -M e3C6H 3) with T i(0 2C N E t2)4 affords Ti(III) and V(III) N,N-diethylcarbam ato derivatives by a simultaneous ligand-and electron-transfer reaction. M agnesium N ,N-diisopropylcarbam ate, M g (0 2CNPr'2)2, has been obtained by a ligand-transfer reaction between M gCp2 and T i(0 2CNPr'2)3. 
  Reference    Z. Naturforsch. 47b, 389 (1992); received A ugust 9 / October 16 1991 
  Published    1992 
  Keywords    N, N-D ialkylcarbam ates, Vanadium, Titanium, Cyclopentadienyl, Electron Transfer 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0389.pdf 
 Identifier    ZNB-1992-47b-0389 
 Volume    47 
63Author    G.E N Arda, E. D. Vega, J. C. Pedregosa, S. B. Etcheverry, E. J. BaranRequires cookie*
 Title    Über die Wechselwirkung des Vanadyl(IV)-Kations mit Calcium-Hydroxylapatit The Interaction of the Vanadyl(I V) Cation with Calcium Hydroxylapatite  
 Abstract    Solid products obtained from calcium hydroxylapatite suspensions in diluted V 0 2+ solu­ tions, under different experimental conditions, were investigated by means o f X-ray powder diffractometry and IR and ESR spectroscopy. It is demonstrated that the V 0 2+ cation cannot be incorporated into the apatite-lattice but is strongly adsorbed on the surface o f the material. Different aspects o f this adsorption were thoroughly investigated. The ESR spectra suggest an inhom ogeneous distribution o f the adsorbed species and the generation o f 0 = V (0)4 moieties, which show a high stability towards oxidation. 
  Reference    Z. Naturforsch. 47b, 395—3 (1992); eingegangen am 12. Juni 1991 
  Published    1992 
  Keywords    Calcium Hydroxylapatite, Vanadyl(IV) Interactions, Powder Diagrams, IR Spectra, ESR Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0395.pdf 
 Identifier    ZNB-1992-47b-0395 
 Volume    47 
64Author    ChristophF. Scheck, FritzH. Frimmel, AndreM. BraunRequires cookie*
 Title    Metallionen als Löscher der Huminstoff-Lumineszenz Metal Ions as Quencher of the Luminescence o f Humic Substances  
 Abstract    Luminescence, Quencher, Iron(II), M anganese(II), Laser Flash Photolysis The luminescence o f aquatic humic substances in water is quenched over a broad range o f pH by paramagnetic metal ions like iron(II) and manganese(II). The efficiency dependents on the pH o f the solution and rises with increasing basicity; this parallels the complexing o f metal ions by humic substances. N o quenching o f the luminescence is observed by the addition o f aluminium(III). 
  Reference    Z. Naturforsch. 47b, 399 (1992); eingegangen am 1. Juli 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0399.pdf 
 Identifier    ZNB-1992-47b-0399 
 Volume    47 
65Author    K. O. Klepp, F. FabianRequires cookie*
 Title    K2Sn4Se8 -ein gemischtvalentes Selenostannat K 2Sn4Seg -A Mixed-Valent Selenostannate  
 Abstract    Potassium Selenostannate(II,IV), M ixed-Valent C om pounds, Crystal Structure Transparent, ruby red crystals o f the new com pound K 2Sn4Seg were obtained from K 2Se, Sn and Se by high temperature synthesis. K 2Sn4Se8 is monoclinic, space-group Cm with a = 6.436(3) Ä, b = 18.934(9) Ä, c = 7.417(5) K ß = 96.26(2)°; Z = 2. The crystal structure was refined to a conventional R o f 0.022 (Rw = 0.018). In K 2Sn4Se8 the tin atom s have two distinct oxidation states +2 and +4. Sn(IV) is tetrahed-rally coordinated by Se, Sn(II) has a pseudo-trigonal bipyramidal coordination M A 4E which reveals a pronounced stereo-activity o f the lone pair o f electrons. In the crystal structure the Sn(IV)Se4-tetrahedra share com m on apices, yielding open sheets which are separated from each other by the alkali cations, but connected via the Sn(II) centers. 
  Reference    Z. Naturforsch. 47b, 406 (1992); eingegangen am 25. Juli 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0406.pdf 
 Identifier    ZNB-1992-47b-0406 
 Volume    47 
66Author    K. Urt, O. KleppRequires cookie*
 Title    Na4SnSe4 und K4SnSe4, zwei neue Selenostannate mit isolierten Anionen N a4SnSe4 and K 4SnSe4, Two New Selenostannates with Discrete Anions  
 Abstract    Transparent yellow single crystals o f N a4SnSe4 and K4SnSe4 were prepared by reacting stoichiometric powdered mixtures o f the binary com pounds N a 2Se or K,Se, Sn and Se at 850 K. N a4SnSe4 is tetragonal, s.g. P 42,c, with a = 8.165(2) Ä, c = 7.268(2) A, Z = 2. K4SnSe4 is orthorhombic, s.g. Pnma, with a = 14.714(7) Ä, b = 10.323(3) A, c = 8.248(6) Ä, Z = 4. The crystal structures were refined to conventional residuals o f 0.058 and 0.031, respec­ tively. Both com pounds are characterized as salts with discrete tetrahedral selenostannate an­ ions. N a4SnSe4 is isostructural with N a4SnS4, K4SnSe4 is o f a new type. The observed S n -S e bond lengths range from 2.494 Ä to 2.536 Ä. 
  Reference    Z. Naturforsch. 47b, 411 (1992); eingegangen am 19. August 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0411.pdf 
 Identifier    ZNB-1992-47b-0411 
 Volume    47 
67Author    Ali Deeb, Besher Bayoumy, Fathy Yasine, Rida FikryRequires cookie*
 Title    Pyridazine Derivatives and Related Compounds, Part 4 [1] Pyrrolo[2,3-c]pyridazines and Furo[2,3-c]pyndazines, Synthesis and Some Reactions  
 Abstract    Ethyl 5-Amino-3,4-diphenyl-7H-pyrrolo[2,3-c]pyridazine-6-carboxylate, Ethyl 5-Aminofuro[2,3-c]pyridazine-6-carboxylate 
  Reference    Z. Naturforsch. 47b, 418 (1992); received May 7 1990 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0418.pdf 
 Identifier    ZNB-1992-47b-0418 
 Volume    47 
68Author    Klaus Burger, Elisabeth Heistracher, Reinhold Simmerl, M. Anfred EggersdorferRequires cookie*
 Title    Hexafluoraceton als Schutzgruppen-und Aktivierungsreagenz in der Aminosäure-und Peptidchemie [1] Synthese Phosphor-substituierter Sarkosin-Derivate unter Verwendung eines neuen elektrophilen Sarkosin-Synthese-Äquivalents [2, 3] Application of Hexafluoroacetone as Protecting and Activating Reagent in Amino Acid and Peptide Chemistry [1] Synthesis of Phosphorus Containing Sarcosine Derivatives via a New Electrophilic Sarcosine Synthone [2, 3]  
 Abstract    Sarcosine, Hexafluoroacetone, 4-Brom o-3-m ethyl-2,2-bis(trifluorom ethyl)-l ,3-oxazolidin-5-one, 4-B rom o-2,2-bis(trifluorom ethyl)-l,3-oxathiolan-5-one, M ichaelis-Arbusov Reaction Phosphono-, phosphino-, and phosphinyl-sarcosine derivatives are obtained from 4-bromo-3-m ethyl-2,2-bis(trifluorom ethyl)-1.3-oxazolidin-5-one (8) via M ichaelis-Arbusov reaction. 
  Reference    Z. Naturforsch. 47b, 424 (1992); eingegangen am 25. Juli 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0424.pdf 
 Identifier    ZNB-1992-47b-0424 
 Volume    47 
69Author    Peter Höhn, Rüdiger KniepRequires cookie*
 Title    LiSr2[CoN2]: A Nitridocobaltate(I) with Linear Anions [CoN2]5  
  Reference    Z. Naturforsch. 47b, 434 (1992); eingegangen am 23. September 1991 
  Published    1992 
  Keywords    Nitridocobaltate(I), Preparation, Crystal Structure, Structural Relations 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0434_n.pdf 
 Identifier    ZNB-1992-47b-0434_n 
 Volume    47 
70Author    Bernd WrackmeyerRequires cookie*
 Title    Sign-Determination of Spin-Spin Coupling Constants in terf-Butylphosphaalkyne  
 Abstract    Phosphaalkynes, Coupling Constants, N M R -'H {3IP} Hetronuclear Double R esonance, Two-dimensional (2D) 13C /'H Heteronuclear Shift Correlations 
  Reference    Z. Naturforsch. 47b, 437 (1992); received September 17 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0437_n.pdf 
 Identifier    ZNB-1992-47b-0437_n 
 Volume    47 
71Author    L. Buchbauer, Jirovetz, B. Remberg, G. RembergRequires cookie*
 Title     
 Abstract    By headspace analysis o f the essential oil o f V e­ tiver hitherto sixteen not described volatile constituents, mainly monoterpenes, could be identified. For these investigations G C -F ID , GC-M S, GC-FTIR and the GC-sniffing-tech-nique were used. 
  Reference    Z. Naturforsch. 47b, 439 (1992); received August 1 1991 
  Published    1992 
  Keywords    Vetiver Oil, Headspace, G C -M S Spectra, G C -FTIR Spectra, GC-Sniffing-Technique 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0439_n.pdf 
 Identifier    ZNB-1992-47b-0439_n 
 Volume    47 
72Author    PeterG. Jones, M. Artina, Näveke Und Arm, BlaschetteRequires cookie*
 Title    Polysulfonylamine, XXXI [1] Kristallstruktur von (1-Trichlormethylthio- 4-dimethylaminopyridinium)dimesylamid bei -9 5 °C Polysulfonylamines, XXXI [1] Crystal Structure o f 1-Trichloromethylthio- 4-dimethylaminopyridinium Dimesylamide at -9 5 °C  
 Abstract    The crystal structure o f the title com pound was determined at -9 5 °C. It crystallizes in space group P 1 with a = 577.5(3), b = 820.2(3), c = 1916.6(8) pm, a = 83.34(2), ß = 82.83(2), y = 83.61(2)° and Z = 2. The final R value was 0.034 for 3019 unique observed reflections. The presence o f aggregates o f four ions (two cations and two an­ ions) in the solid state is observed, with short cat-ion-anion contacts Sn — 0 (290 pm) and Cl --O (298 pm). The bond lengths o f the 4-dimethyl-aminopyridinium moiety o f the cation suggest a semiquinoid resonance form with a double bond to the nitrogen o f the dim ethylam ino group and two localized double bonds in the ring. The ring, the dimethylamino group (except H atom s) and the Sn atom are coplanar. The S " -N bond length is 170.3 pm, the N -S " -C angle 99.6°. The S ° -C bond is approximately perpendicular to the ring plane. 
  Reference    Z. Naturforsch. 47b, 441—4 (1992); eingegangen am 17. September 1991 
  Published    1992 
  Keywords    Pyridinium, Dimesylamide, Polysulfonylamine, X-Ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0441_n.pdf 
 Identifier    ZNB-1992-47b-0441_n 
 Volume    47 
73Author    Roswitha Schmidt, Rüdiger KniepRequires cookie*
 Title    Zn4Fe  
 Abstract    ,15(P 0 4)6*4H 20 : Eine reduzierte und "aufgefüllte" Variante der Zn2(Z n,_xFeJ.)FeII,(P 0 4)3 • 2 H 20-Struktur Zn4FeH5(P 0 4)6-4 H 20 : A Reduced and "Filled" Variant of the Zn2(Z n ,_vF ev)Fem(P 0 4)3 • 2 H 20 Structure Single crystals o f Zn4F en5(P 0 4)6-4 H 20 were grown by hydrothermal treatment o f phospho-phyllite (Zn2F e(P 0 4)2-4 H 20)_ in H 20 at 180 °C. The crystal structure (tricl., P 1; a = 651.6(4) pm, b = 902.7(4) pm, c = 995.4(4) pm, a = 69.01(5)°, ß = 78.19(5)°, y = 75.33(5)°; Z = 1) can be derived from the Zn2(Z n,_vF ev)F eni(P0 4)3-2 H20 struc­ ture by reduction o f F e111 to F e11 and by filling a "structure hole" with an additional Fe11. 
  Reference    Z. Naturforsch. 47b, 445 (1992); eingegangen am 23. September 1991 
  Published    1992 
  Keywords    Orthophosphate o f Z n /F e11, Isotypic Relation, Preparation, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0445_n.pdf 
 Identifier    ZNB-1992-47b-0445_n 
 Volume    47 
74Author    SiegfriedH. Uneck, Jasmin Jakupovicb, G.Erhard FollmRequires cookie*
 Title    The Final Structures of the Lichen Chromones Galapagin, Lobodirin, Mollin, and Roccellin  
 Abstract    The structures o f the lichen chrom ones galapa­ gin, lobodirin, mollin, and roccellin, specific com ­ pounds o f Roccellaceae (lichens), have been es­ tablished as 1, 2, 3, and 4, respectively, by NOE difference spectroscopoy. 
  Reference    Z. Naturforsch. 47b, 449 (1992); received July 151991 
  Published    1992 
  Keywords    Lichens, Chromone Glucosides, NOE Difference Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0449_n.pdf 
 Identifier    ZNB-1992-47b-0449_n 
 Volume    47 
75Author    M. Atthias, Westerhausen, Wolfgang SchwarzRequires cookie*
 Title    Calcium-bis|N,N-bis(trimethylsilyl)benzamidinat]-THF (1/2) - Synthese, spektroskopische Charakterisierung und Struktur Calcium-bis[N,N'-bis(trimethylsilyl)benzamidinate]-THF (1/2) - Syntheses, Spectroscopic Characterization and Structure  
 Abstract    Calcium -bis[N,N'-bis(trimethylsilyl)benzam idinate], Benzamidinate, Synthesis, Crystal Structure The reaction o f calcium-bis[bis(trimethylsilyl)amide]-THF (1/2) with benzonitrile in THF nearly quantitatively yields the title com pound calcium-bis[N,N'-bis(trimethylsilyl)-benzamidinate]-THF (1/2). U nder similar conditions pivalonitrile substitutes an ether ligand o f calcium-bis[bis(trimethylsilyl)amide]-DM E (1/2) without the formation o f the correspond­ ing amidinate derivative. The calcium-di(benzamidinate) [H5C6-C (N S iM e 3)2]2Ca • 2T H F crys­ tallizes in the space group Pbcn with {a = 188.8(6); b = 1286.0(3); c = 1802.5(5) pm; Z = 4}. The calcium atom is hexa-coordinate with a distorted octahedral ?ra«s-configuration and with C a -O and C a -N bond distances o f 238 and 243 pm, respectively. The bond lengths within the N C N moiety with values o f 132 pm are characteristic o f a diazaallylic system. The short N -S i bond lengths o f about 170.5 pm as well as the high field shift o f the 29S i{ 1H } N M R signal are evidence for an effective backdonation o f the anionic charge from the nitrogen to the silicon atoms. 
  Reference    Z. Naturforsch. 47b, 453 (1992); eingegangen am 27. September 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0453.pdf 
 Identifier    ZNB-1992-47b-0453 
 Volume    47 
76Author    Klaus Brodersen, Jürgen HofmannRequires cookie*
 Title    Synthese und Kristallstruktur von Bis(m-aminobenzonitril)- diquecksilber(I)-dinitrat Synthesis and Crystal Structure of Bis(m-aminobenzonitrile)dimercury(I)-dinitrate  
 Abstract    Bis(m-aminobenzonitrile)dimercury(I)-dinitrate, Synthesis, Crystal Structure The structure o f bis(m-aminobenzonitrile)dimercury(I) dinitrate, [Hg2(m -N H 2C6H4C N)2] (N 0 3)2 has been determined by single crystal X-ray diffraction tech­ niques and refined to an /^ -value o f 0.022. The crystals are triclinic, space group P 1 with a = 5.4878(1)Ä , b = 8.4085(1)A, c = 9.6062(1)A , a = 92.599(3)°, ß = 94.763(3)°, y = 89.614(3)° and Z = 1. The Hg22+-ion [H g -H g 2.524(1) A] is approximately axially coordinated to amino nitrogen atom s [H g -N 2.209(4)Ä , H g -H g -N 169.5(3)°]. Additional amino hydrogen bonds to oxy­ gen are building chains along the b-axis containing units o f L -H g -H g -L groups. 
  Reference    Z. Naturforsch. 47b, 460 (1992); eingegangen am 28. August 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0460.pdf 
 Identifier    ZNB-1992-47b-0460 
 Volume    47 
77Author    (. N., G. Cl, U. Steffen3, M.A H Kaschuba3, D. Itchm Anb, Reinen3Requires cookie*
 Title    Über die Natur der Cu2+-Zentren im N H 4C1 - die spektroskopische Untersuchung von Cu2+-dotiertem H g(N H 3)2Cl2 The N ature of the Cu2+ Centres in N H 4C1 - a Spectroscopic Investigation of Cu2+ Doped  
 Abstract    The preparation o f H g(N H 3)2Cl2 doped with a small amount o f Cu2+ is reported. The EPR and ligand field reflectance spectra indicate the presence o f "CuC14(N H 3)2" polyhedra with a compressed tetragonal geometry and confirm, that the centres in Cu2+ doped N H 4C1 possess the same geometry -as postulated earlier. The Cu2+ centres in H g(N H 3),C l2 are less com ­ pressed than those in N H 4C1, however, as could be deduced from the copper(II) hyperfine values, which are strongly influenced by the quite different admixture o f the metal 4 s orbital into the A lg (d,?) ground state in the two cases, and from the comparable energies o f the d -d transitions. 
  Reference    Z. Naturforsch. 47b, 465 (1992); eingegangen am 12. September 1991 
  Published    1992 
  Keywords    Compressed CunCl4(N H 3)2 Centres, Vibronic Jahn-Teller Coupling, EPR Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0465.pdf 
 Identifier    ZNB-1992-47b-0465 
 Volume    47 
78Author    K. Urt Merzweiler, FrankR. Udolph, Ludwig BrandsRequires cookie*
 Title    Neue metallorganisch substituierte Indium-Chalkogen-Verbindungen mit In4E4-Heterokubangerüst (E = S, Se, Te) New Organoindium Chalcogen Com pounds with In4E4 Heterocubane Structure (E = S, Se, Te)  
 Abstract    Indium Chalcogen Heterocubane The reaction o f organometallic indium halides R2InBr and RInCl2 (R = {Cp(CO)2F e}, {C p(CO)3M o}) with silylated chalcogens E(SiM e3)2 (E = S, Se, Te) leads to the formation o f cage com pounds which contain a central In4E4 cube. The structures o f [{Cp(CO)2F e}4In4Se4] (1), [{C p(C O)3M o } 4In4S4] (2), [{C p(C O)2F e}4In4S4] (3) and [{Cp(CO)3M o}4In4Te4] (4) were determined by X-ray crystallography. 
  Reference    Z. Naturforsch. 47b, 470—4 (1992); eingegangen am 26. August 1991 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0470.pdf 
 Identifier    ZNB-1992-47b-0470 
 Volume    47 
79Author    Requires cookie*
 Title    Ca2[FeN2l und Sr2IFeN2]: Nitridoferrate(II) mit isolierten Anionen [Fe2N 4l8~ und [FeN2]4  
  Reference    Z. Naturforsch. 47b, 477 (1992) 
  Published    1992 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0477.pdf 
 Identifier    ZNB-1992-47b-0477 
 Volume    47 
80Author    M. =. Re, Tc, X. =. Ci, BrJ. Skowronek, W. PreetzRequires cookie*
 Title    Schwingungsspektren und Normalkoordinatenanalyse der Acetatohalogenodimetallate M 2( 0 2CCH3)4X2, M = Re, Tc; X = CI, Br Vibrational Spectra and Norm al Coordinate Analysis of Acetatohalogenodim etalates M 2( 0 2C CH 3)4X  
 Abstract    The orange-red Tc2(0 2C C H 3)4Br2 has been prepared for the first time by reaction of [Tc2Brg]2_ with glacial acetic acid and acetic anhydride. The IR and R am an spectra have been recorded at 80 K and are compared with those of the analogous com pounds Tc2(0 2CC H 3)4C12, Re2(0 2C C H 3)4Cl2 and Re2(0 2CC H 3)4Br2. The assignment according to the point group D 4h is supported by normal coordinate analysis based on a general valence force field. The quadruple M -M bond is stabilized by the bridging acetato and destabilized by the axial halogeno ligands. The valence force constants fd(MM) are determined to 3,96-4,08 mdyn/A. The inter­ action constants fdd(M M /M X), fdd(M M /M O) and fJM M /M M O) are ab o u t three times high­ er for the technetates as compared with the rhenates. The stronger interaction between oppo­ site bonds in the equatorial ligand sphere is revealed by the stretching interaction constants d d '' which are about two times higher than fdd for M -O bonds at right angles. The strong coupling of the ring co-ordinates implies extensive mixing of the M -O valence and deform ation modes. The electronic spectra of Tc2(0 2CC H 3)4X, agree with those of the corresponding Re com ­ pounds. 
  Reference    Z. Naturforsch. 47b, 482—490 (1992); eingegangen am 10. Oktober 1991 
  Published    1992 
  Keywords    Tetraacetatodihalogenodirhenates, Tetraacetatodihalogenoditechnetates, Vibrational Spectra, UV-Vis Spectra, Normal Coordinate Analysis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0482.pdf 
 Identifier    ZNB-1992-47b-0482 
 Volume    47 
Prev
1
2
3
4
5
...
Next