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21Author    Werner Zeiß, Wolfgang Schwarz, Heinz HessRequires cookie*
 Title    995  
 Abstract    W. Zeiß et al. • (MePNMe)4S3, ein Cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazan) (MePNMe)4S3, a Cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazane) 31 P} Decoupling Octamethylcyclotetra(A 3 -phosphazane) (1) reacts with three mole equivalents of sulfur, added either in excess or in deficite, to give 2, the first cyclotetra(A 3 ,A 5 ,A 5 ,A 5 -phosphazane). Its crystal structure determination shows a completely unsymmetrical molecule, which does not undergo ring inversion in solution. Thus an ABMX spin system with remarkably different AM and BM coupling constants is observed in the 31 P{ 1 H} NMR spectrum. By means of selective { 31 P} decoupling, all CH3 proton signals could be assigned in the 1 H NMR spectrum. 
  Reference    Z. Naturforsch. 35b, 959—963 (1980); eingegangen am 29. Februar 1980 
  Published    1980 
  Keywords    Cyclotetraphosphazane, Crystal Structure, NMR Spectra, Selective { 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0959.pdf 
 Identifier    ZNB-1980-35b-0959 
 Volume    35 
22Author    C. Cnossen-Voswijk, J. C. Van De Grampel, C. KrukRequires cookie*
 Title    Derivatives of cis-NPCl2(NSOCl)2 and (NPC12)2NS0C1, Part XV [1] Methyl-and Ethylamino Derivatives of (NPCl2)2NSOPh  
 Abstract    The aminolysis of (NPCl2)2NSOPh by methyl-and ethylamine in diethylether proceeds mainly via a non-geminal substitution pattern. In acetonitrile both geminal and non-geminal substitution is observed. The preparation of the derivatives is described and the iH and 31 P NMR data are discussed. The interpretation of the NMR spectra is supported by the simulation of the spectra of NPClNHMeNPCl2NSOPh. 
  Reference    Z. Naturforsch. 35b, 1559—1564 (1980); received August 11 1980 
  Published    1980 
  Keywords    Ethylamino Derivatives, Methylamino Derivatives, NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1559.pdf 
 Identifier    ZNB-1980-35b-1559 
 Volume    35 
23Author    Peter Dehnert, Joseph Grobe, Due Le VanRequires cookie*
 Title    Perfluormethyl-Element-Liganden, XXTV [I]* Organozinnverbindungen als Reagenzien, DI [2] Spaltungsreaktionen der Element-Element-Bindung in Verbindungen des Typs RnE-ERTO (R = CH3, CF3-E =P, AS, Se, Te * n,m = l, 2)  
 Abstract    A systematic study of the cleavage of element-element bonds in compounds of the type R"E-ERm (R = CH3, CF3; E = P, As, S, Se, Te; n,m = 1, 2) by the group IV A element hydrides Me3M'H (M' = Si, Ge, Sn; Me — CH3) has been carried out. To evaluate the reaction pathway, for a number of compounds the attack of H2O, CH3OH, HBr and HI has been investigated. Possible reaction intermediates have been synthesized by in-dependent routes and tested under comparable conditions. 
  Reference    (Z. Naturforsch. 36b, 48—54 [1981]; eingegangen am 14. August 1980) 
  Published    1981 
  Keywords    Organoelement-Element Compounds, Perfluoromethyl Derivatives, NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0048.pdf 
 Identifier    ZNB-1981-36b-0048 
 Volume    36 
24Author    W. PetzRequires cookie*
 Title    Über die Reaktion von [(C0)4FeC(0)NMe2]-[C(NMe2)3] + mit einigen Diorganylbromboranen On the Reaction of [(C0)4FeC(0)NMe2]-[C(NMe2)3 + with Some Diorganoboron Bromides  
 Abstract    The carbamoyl complex [(C0)4FeC(0)NMe2][C(NMe2)3] (1) reacts with boron halides of the type BrBR2 (R = Me, Ph, NMe2) at low temperature to give the boroxycarben com-plexes 2, which decompose at ambient temperature to the aminoboranes 3 and Fe(CO)s. The NMR and IR spectra of the new compounds 2 are reported. 
  Reference    Z. Naturforsch. 36b, 335—338 (1981); eingegangen am 12. November 1980 
  Published    1981 
  Keywords    Boroxycarben Ligands, Iron Carbonyl Complexes, NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0335.pdf 
 Identifier    ZNB-1981-36b-0335 
 Volume    36 
25Author    Willy GomblerRequires cookie*
 Title    NMR-spektroskopische Untersuchungen an Chalkogenverbindungen, II [1] 12o Te-, 77 Se-, 19 F-und 13 C-chemische Verschiebungen von CF3-substituierten Selen-und Tellurverbindungen [2] NMR Spectroscopic Studies on Chalcogen Compounds, II [1] 125 Te, 77 Se, »F and * 3 C Chemical Shifts of CF3 Substituted Selenium and Tellurium Compounds [2]  
 Abstract    77 Se chemical shifts of compounds CF3SeX exhibit an extraordinary good linear correla-tion with Huggins' electronegativities of X, %x-A range of 1051 ppm is covered for yx values between 1.9 and 3.15. Effective electronegativities are derived from the <5(77 Se) values. For some compounds unexpected 77 Se chemical shifts are found. This indicates an uncommon electronic constitution at selenium. Electron excitation energies are reported for some of the compounds and their importance for the paramagnetic shielding term is discussed. The relative shieldings of the tellurium compounds are analogous to those of the corresponding selenium compounds. In contrast to 77 Se, the 19 F shieldings of CF3EX compounds (E = chalcogen) depend inversely on the electronegativity of E and X. The 13 C chemical shifts do not correlate with the xx values. NMR data of some CF3Se(IV) and CF3Te(IV) compounds are also reported for comparison. 
  Reference    Z. Naturforsch. 36b, 535—543 (1981); eingegangen am 21. Januar 1981 
  Published    1981 
  Keywords    NMR Spectra, Trifluoromethyl Group, Selenium, Tellurium 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0535.pdf 
 Identifier    ZNB-1981-36b-0535 
 Volume    36 
26Author    -), Cyclotetra, Phosphazane, Werner Zeiß, Tino Kuhn, Dieter Lux, Wolfgang Schwarz, Heinz HessRequires cookie*
 Title    (MePNMe)4 Mel und (MePNMe)4 2 Mel, ein Cyclotetra(A 3 .A 3 .A 3 .A 5 -) und ein Cyclotetra(A 3 .A 5 .A 3 .A 5 -phosphazan) (MePNMe)4 * Mel and (MePNMe)4 * 2 Mel, a Cyclotetra  
 Abstract    (2) with three P 111 and one P v , and (3) with two P In and P v atoms are prepared from 1 with methyl iodide. NMR spectra of 2 are compared with those of the recently prepared [1] 4. The crystal structure of 3 shows the molecule to have a crystallographic inversion centre. Thus cis-trans isomerisation must have taken place during the working up procedure. Alkylation has severe consequences on bond distances and bond angles of the cyclotetraphosphazane ring system, in contrast to M(CO)s complexation at the same positions as shown in a similar case recently [8]. 
  Reference    Z. Naturforsch. 36b, 561—565 (1981); eingegangen am 9. Dezember 1980 
  Published    1981 
  Keywords    Cyclotetraphosphazanes, NMR Spectra, Crystal Structure Cyclotetraphosphazanes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0561.pdf 
 Identifier    ZNB-1981-36b-0561 
 Volume    36 
27Author    Ertugrul Arpac, Lutz DahlenburgRequires cookie*
 Title    Oligophosphin-Liganden, III [1] Bis(3-diphenylphosphinopropyl)phenylphospbinchloroiridium(I) * * und dessen Carbonyl-und Hydridderivate Oligophosphine Ligands, III [1] Bis(3-diphenylphosphinopropyl)phenylphosphinechloroiridium(I) and its Carbonyl and Hydride Derivatives  
 Abstract    The title complex, IrCl(bdpp) (1), where bdpp = PhP[(CH2)3PPh2]2, has been obtained from [IrCl(C8Hi4)2]2 and the triphosphine ligand. Characteristic 31 P NMR data of 1 dissolved in THF are <5(PPh2) = 2.7 and <3(PPh) = —19.9 with cis-2 J(PIrP) = 32.8 Hz. Reaction of 1 with CO proceeds stepwise to yield five-coordinate IrCl(CO)(bdpp) (2) and ionic [Ir(CO)2(bdpp)]Cl (3). A trigonal bipyramidal geometry with equatorial CO ligands is assigned to the cation of 3 on the basis of its v(CO) infrared intensities. When allowed to react with HCl, 1 gives the monohydride IrHCl2(bdpp) (4). Similarly, the dihydride IrH2Cl(bdpp) (5) is formed from 1 and H2. As has been established by IR and NMR spectroscopy, 4 and 5 adopt cis-wer-octahedral structures. 
  Reference    Z. Naturforsch. 36b, 672—676 (1981); eingegangen am 9. März 1981 
  Published    1981 
  Keywords    Bis(3-diphenylphosphinopropyl)phenylphosphine, Iridium Complexes, NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0672.pdf 
 Identifier    ZNB-1981-36b-0672 
 Volume    36 
28Author    Römer, H. Scholl, H. Budzikiewicz, H. Korth, G. PulvererRequires cookie*
 Abstract    The structure elucidation of several minor phenazine pigments of Pseudomonads is described. 4-Hydroxyphenazine-l,6-dicarboxylic acid dimethyl ester, 2,3-dihydroxy-phenazine, 2,3,7-trihydroxyphenazine, 4-hydroxyphenazine-l-carboxylic acid, 2,3-di-hydroxyphenazine-l-carboxylic acid, 2,6-dihydroxyphenazine-l-carboxylic acid and 2,3,7-trihydroxyphenazine-l,6-dicarboxylic acid are new phenazine derivatives. The distribu-tion of phenazines in the genus Pseudomonas is investigated. 
  Reference    Z. Naturforsch. 36b, 1037—1046 (1981); eingegangen am 27. März 1981 
  Published    1981 
  Keywords    Phenazines, Bacterial Constituents, Pseudomonads, NMR Spectra, IR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1037.pdf 
 Identifier    ZNB-1981-36b-1037 
 Volume    36 
29Author    HansH. KarschRequires cookie*
 Title    Funktionelle Trimethylphosphanderivate, XVII [1]  
 Abstract    Methyl-bis(dimethylphosphinomethyl)phosphan, (Me2PCH2)2PMe Functional Derivatives of Trimethylphosphane, XVII [1] Methyl-bis(dimethylphosphinomethyl)phosphane, (Me2PCH2)2PMe (Me 2 PCH2)2PMe (3) is obtained from MePCl 2 (2a) or MeP(OPh) 2 (2b) and LiCH 2 PMe 2 (1). The oxides [Me 2 P(0)CH 2 ] 2 PMe (4) and [Me 2 P(0)CH 2 ] 2 P(0)Me (5), are formed on the reaction with air. Quaternisation with Mel gives the salts [(Me3PCH2)2PMe]l2 (6) and [(Me3PCH2)2PMe2]l3 (12). For comparison, also the isoelectronic (Me3SiCH2)2PMe (7), and (Me3SiCH2)2P 4 Bu (8), are synthesized and transformed to their methylphosphonium salts 10 and 11. WithCH 2 Br 2 , 3 forms the six-membered heterocycle [MeP(CH 2 PMe2)2CH 2 ]Br2 (13 a), which could not be isolated in a pure state, however. 3 may be metalated by LiBu: Li[Me2PCHP(Me)CH2PMe2] (15), is obtained, but a second metalation step could not be observed. The hydrolysis of 12 under unusual mild conditions (H2O or H2O/CH3OH) gives [Me2P(0)CH 2 PMe3]I (16), and [Me 4 P]I (17), as main products. Properties and NMR data of the new compounds are described. 
  Reference    Z. Naturforsch. 37b, 284—291 (1982); eingegangen am 12. Oktober 1981 
  Published    1982 
  Keywords    Triphosphane (PCPCP), Phosphonium Salts, Hydrolysis, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0284.pdf 
 Identifier    ZNB-1982-37b-0284 
 Volume    37 
30Author    Elmar Flaskamp, -A, Gottfried Zimmermann, »., Gerhard Nonnenmacher, Otto IsaacRequires cookie*
 Title    Untersuchungen zur Charakterisierung des Prochamazulens Matrizin aus Matricaria chamomilla L. Studies on the Characterization of the Chamazulene Precursor Matricine from Matricaria chamomilla L  
 Abstract    The relative configuration of the thermolabile chamazulene precursor matricine has been established by NMR spectrometric studies. The NMR spectral data prove to be consistent with the well-known structure of the chamomile component. On the basis of our results the levorotatory natural substance moreover can be specified stereochemically as (—)-(3S*, 3aR*, 4S*, 9R*, 9aS*, 9bS*)-4-acetoxy -2,3,3a,4,5,9,9a,9b -octahy dro -9 -hydroxy -3,6,9 -trimethy lazuleno [4,5 -b ]furan -2 -one. 
  Reference    Z. Naturforsch. 37b, 508—511 (1982); eingegangen am 24. November 1981 
  Published    1982 
  Keywords    Matricaria chamomilla L, Matricine, NMR Spectra, Stereochemistry 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0508.pdf 
 Identifier    ZNB-1982-37b-0508 
 Volume    37 
31Author    Herbert Schumann, Karl-Heinz Köhricht, Manfred MeißnerRequires cookie*
 Title    Organometallphosphin-substituierte Übergangsmetallkomplexe, XIX [1] Carbonyl-dinitrosyl-organometallphosphin-eisen-Komplexe Organometalphosphine-substituted Transition Metal Complexes, XIX [1] Carbonyl Dinitrosyl Organometalphosphine Iron Complexes Die Komplexe der Pseudonickelcarbonyl-Serie  
 Abstract    The reactions of dicarbonyl dinitrosyl iron with tri-fertf-butylphosphine, di(feri-butyl)-trimethylsilyl-, -germyl-, -stannyl-phosphine, ferZ-butyl-bis(trimethylsilyl)-, -(germyl)-, -(stannyl)phosphine, as well as with tris(trimethylsilyl)-, -(germyl)-, and -(stannyl)phos-phine result in the elimination of one CO ligand and the formation of the corresponding carbonyl dinitrosyl organometalphosphine iron complexes. The IR, X H, 31 P, 13 C, and 119 Sn NMR spectra of the new complexes are reported and discussed. 
  Reference    Z. Naturforsch. 38b, 705—710 (1983); eingegangen am 22. Februar 1983 
  Published    1983 
  Keywords    Organometal Phosphines, Carbonyl Dinitrosyl Iron Complexes, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0705.pdf 
 Identifier    ZNB-1983-38b-0705 
 Volume    38 
32Author    Fritz Seel, Norbert KleinRequires cookie*
 Title    N-Methylcarbamoylphosphate, I. Synthese N-Methylcarbamoyl Phosphates, I. Synthesis  
 Abstract    Solutions of mono-and bis-N-methylcarbamoyl phosphates in non-aqueous solvents [e.g. acetonitrile, dimethyl formamide, chloroform) and, surprisingly, even in water are readily obtained by the reaction of methyl isocyanate with the solution of an appropriate mono-or dihydrogenphosphate. The course of the reactions and the limited stability of N-methylcarbamoyl phosphate ions in solutions can be monitored through 31 P NMR measurements. Various types of compounds, including a coordination compound of cobalt could.be isolated in crystalline form: [Et3NH]HX, KHX, NH4HX, Na2X • H20, MgX • 4 H20, CaX • H20, SrX • 2 HaO, BaX • H20, ZnX • 5 H20, CdX • 2 H20, [(NH3)5COX]C104, [EtsNHjY, AgY • MeCN, X = MeNHC(0)0P03, Y = [MeNHC(0) 0]2P02. 
  Reference    Z. Naturforsch. 38b, 797—803 (1983); eingegangen am 24. Februar 1983 
  Published    1983 
  Keywords    N-Methylcarbamoyl Phosphates, Preparation, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0797.pdf 
 Identifier    ZNB-1983-38b-0797 
 Volume    38 
33Author    Wieland Krüger, Michael Sell, Reinhard SchmutzlerRequires cookie*
 Title    A New Synthesis of Organodifluorophosphites and their Reactions with Platinum(II) Complexes  
 Abstract    Alkyldifluorophosphites, ROPF2 (R = ^-substituted benzyl group, neopentyl, 1-ada-mantyl) have been obtained by a new method, involving reaction of the appropriate alkyl trimethylsilylether, ROSiMe3 with chlorodifluorophosphine, PF2C1. Reactions of these difluorophosphites with platinum(II) complexes of the type [LaPtCla] (L = PEt3, PPI13) led to products such as irans-[L2PtCl(POF2)] and {[p-XC6H4CH2PPh3]+}2[Pt(POF2)4] 2 -, (X = H, Me, Cl, N02). The ease of carbon-oxygen cleavage in ROPF2 is characteristically related to the nature of the leaving group, R. 
  Reference    Z. Naturforsch. 38b, 1074—1080 (1983); received April 25 1983 
  Published    1983 
  Keywords    Organodifluorophosphites, Difluorophosphonate Complexes, Platinum, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1074.pdf 
 Identifier    ZNB-1983-38b-1074 
 Volume    38 
34Author    Angelika Sebald, Bernd WrackmeyerRequires cookie*
 Title    Bequeme Synthese von eis-1,2- Bis(diphenylphosphino)ethanplatin(II)- acetyliden Convenient Synthesis of m-1,2-Bis(diphen3dphosphino)- ethane-platinum (II) -acetylides  
 Abstract    The title compounds (1) are obtained in quantitative yield from the reaction between dppePtCl2 (2) and alkynyl stannanes (CH3)3Sn-C=C-R (8) or (CH3)2Sn(C=C-R)2 (4) in boiling tetrahydrofurane. The complexes 1 have been characterised by multinuclear NMR PC, 31 P, 195 Pt). 
  Reference    Z. Naturforsch. 38b, 1156—1158 (1983); eingegangen am 3. Juni 1983 
  Published    1983 
  Keywords    Platinum(II)-acetylides, Synthesis, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1156_n.pdf 
 Identifier    ZNB-1983-38b-1156_n 
 Volume    38 
35Author    Alfred Schmidpeter, Hubert KlehrRequires cookie*
 Title    Überführung von Triazaphospholen in Diazaphosphole durch Acetylenaddition/Nitrileliminierung [1] Conversion of Triazaphospholes into Diazaphospholes by Acetylene Addition/Nitrile Elimination [1]  
 Abstract    Acetylene di-and (less easily) monocarboxylic esters replace nitriles from the 4,5-position of 1,2,4,3-triazaphosphole rings to give carboxyl derivatives of 1,2,3-diaza-phospholes, presumably by a cycloaddition/cycloreversion mechanism. In cases with a mobile N-substituent alternatively the loss of N2 seemed feasible, but was normally not observed. 
  Reference    Z. Naturforsch. 38b, 1484—1487 (1983); eingegangen am 7. Juli 1983 
  Published    1983 
  Keywords    Dicoordinate Phosphorus, Azaphospholes, Cycloaddition, Cycloreversion, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1484.pdf 
 Identifier    ZNB-1983-38b-1484 
 Volume    38 
36Author    Joseph Grobe, G. Erald, H. Enkel, B. Ernt Krebs, Nikolaos VoulgarakisRequires cookie*
 Title    Atran-analoge Verbindungen des Typs Me(R)SiSiMe (OCH2CH2)2N I I (I) o  
 Abstract    c h 2 Atrane Analogous C om pounds of the Type M e(R)SiSiM e (OCH->CH2)?N I 1 (1) Heterocyclic cage compounds of type I (compounds 8—10) have been prepared by condensa­ tion reactions of 1,2,2-trifunctional disilanes M e(R)XSiSiM eX2 (R = Me, Ph, OEt; X = NMe2, OEt) with triethanolamine using the "Dilution Principle". The starting compounds are obtained by Si—Me cleavage of Si2Me6 with acetylchloride/AlCl3 followed by either aminolysis with HNMe2 or alcoholysis with EtOH. 'H NMR spectra indicate N—*Si(l) intraction with the more acidic Si 
  Reference    Z. Naturforsch. 39b, 341—351 (1984); eingegangen am 30. August/26. Oktober 1983 
  Published    1984 
  Keywords    Silatranes, Transanular N — * Si-Interactions, NMR Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0341.pdf 
 Identifier    ZNB-1984-39b-0341 
 Volume    39 
37Author    Joseph Grobe, Due Le VanRequires cookie*
 Title    Reactive E=C (p-p)jr-Systems III [1]: Diels Alder Reactions with F 3 CP=CF 2 as Dienophile  
 Abstract    The perfluorophosphaalkene F 3 CP=CF 2 (1) reacts as a dienophile at temperatures between —20 and +15 °C with cyclopentadiene, 1,3-cyclohexadiene, butadiene and 2,3-dimethyl-butadiene, respectively, giving the corresponding Diels-Alder adducts 2 to 5 in high yields. The observed reactivity proves the close relationship of P=C and C=C systems. CF2 >F^ CF 2 
  Reference    Z. Naturforsch. 40b, 467—469 (1985); eingegangen am 27. November 1984 
  Published    1985 
  Keywords    Perfluorophosphaalkene, Diels-Alder Reactions, Mass Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0467.pdf 
 Identifier    ZNB-1985-40b-0467 
 Volume    40 
38Author    Ekkehard Lindner, Fritz Zinßer, HermannAugust Mayer, Wolfgang Hiller, Riad FawziRequires cookie*
 Title    Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, XLVII [1] Einschiebungsreaktionen von phasentransferkatalytisch in situ erzeugten Dihalocarbenen in P-haltige Manganacycloalkane — Struktur und chemisches Verhalten der Reaktionsprodukte Preparation and Properties of and Reactions with Metal-Containing Heterocycles, XLVII [1] Insertion Reactions of Phase-Transfer-Catalytically in situ Generated Dihalocarbenes into P-Containing Manganacycloalkanes — Structure and Chemical Behaviour of the Reaction Products  
 Abstract    The phase-transfer-catalytically in situ generated dihalocarbenes CC1 2 and CBr 2 are inserted into a ß-C—H bond of the five-and six-membered phosphamanganacycloalkanes (OC) 4 MnPPh 2 (CH 2)"CH 2 CH 2 (la, b) [n = 1(a), 2(b)] to give the functionalized metallacycles (OC) 4 MnPPh 2 (CH 2)"CH(CHX 2)CH 2 (2a, a', b, b') [X = Cl: n = l(a), 2(b); X = Br: n = l(a'), 2(b')]. 2b crystallizes in the orthorhombic space group Pbca with Z = 8 and has a distorted chair conformation with equatorial position of the CHC1 2 group. The envelope conformation of 2a in solution was elucidated by means of 'H and 13 C{'H} NMR spectroscopic investigations. 
  Reference    Z. Naturforsch. 40b, 615—623 (1985); eingegangen am 20. Dezember 1984 
  Published    1985 
  Keywords    Dihalocarbene Insertion, Manganacycloalkanes, X-Ray, NMR Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0615.pdf 
 Identifier    ZNB-1985-40b-0615 
 Volume    40 
39Author    Willy GomblerRequires cookie*
 Title    NMR-spektroskopische Untersuchungen an Chalkogenverbindungen, VI [1] S-Isotopeneffekte auf 19 F-NMR-Frequenzen und ihre Abhängigkeit von Bindungslängen NMR Spectroscopic Studies on Chalcogen Compounds, VI [1] l4 S Isotope Effects on 19 F NMR Frequencies and their Dependence on Bond Lengths  
 Abstract    Nineteen values for 34 S-induced isotope shifts on the NMR frequency of directly bonded fluorine of fourteen S(II), S(IV), and S(VI) compounds are reported. The dependence of these l A 19 F(34/32 S) values on the S —F bond length is demonstrated. Three reasons for this correlation are discussed. (1) A nonlinear dependence of nuclear shielding on bond distance. (2) Decreasing energy difference of two isotopomers with increasing bond distance. (3) Decreasing anharmonicity of the potential curve with increasing bond length. Some previously unknown S—F bond distances have been estimated by this correlation. The isotope shifts decrease with increasing temperature. This is attributed to vibrationally excited states in conjunction with a nonlinear dependence of nuclear shielding on bond distance. Furthermore, 34 S-induced isotope shifts on fluorine-19 over two bonds, 2 A 19 F(34/32 S), have been observed for the first time, and the 33 S-induced isotope effect in SF 6 has been measured. 
  Reference    Z. Naturforsch. 40b, 782—786 (1985); eingegangen am 6. Februar 1985 
  Published    1985 
  Keywords    NMR Spectra, S-F Bond Length, Sulfur Fluorine Compounds 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0782.pdf 
 Identifier    ZNB-1985-40b-0782 
 Volume    40 
40Author    FranzL. Dickert, MichaelW. VonendRequires cookie*
 Title    Konkurrierende Koordination von Kronenethern, Perchloratanionen und Lösungsmittelmolekülen am Co(II)-Ion — Eine Leitfähigkeits-und NMR-Studie in Nitromethan Anions and Solvent Molecules at Co(II)-Ions — A Conductivity and NMR Study on Nitromethane  
 Abstract    The 1:1 complexes between Co(II) and the crown ethers dibenzo[24]crown-8, dibenzo[18]-crown-6 and [18]crown-6 show a molar conductivity in nitromethane which indicates coordination of even Perchlorate anions. The substitution of this anion by solvent molecules can be monitored by conductometric titrations. This procedure reveals that dibenzo[24]crown-8 and [18]crown-6 is a potent five dentate ligand whereas dibenzo[18]crown-6 strongly coordinates only via three donor atoms. The mixed complexes with crown ether and methanol show strong outer-sphere associa-tion with the Perchlorate anions, which can be confirmed by investigations with [15]crown-5 complexes. 
  Reference    (Z. Naturforsch. 42b, 42—46 [1987]; eingegangen am 15. August/17. Oktober 1986) 
  Published    1987 
  Keywords    Crown Ether, Complex Formation Ionic Conductivity, NMR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0042.pdf 
 Identifier    ZNB-1987-42b-0042 
 Volume    42