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21Author    OttoJ. Scherer, Heribert JungmannRequires cookie*
 Title    Phosphor-Ylid-Komplexe des Platins Phosphorus Ylide Complexes of Platinum  
 Abstract    The interaction of eis/trans-[Pt(PPI13) 2 (CH2CI)Cl] (1) with Ph 3 P gives the ylide complex cis-[Pt(PPh 3) 2 (CH 2 PPh 3)Cl]Cl (2), which forms cis-[Pt(PPh 3)(CH 2 PPh 3)Cl 2 ] (3) on heating in benzene. In CH 2 C1 2 , Ph 3 P is added again quanti-tatively with formation of 2. Irradiation of 3 with a 500 W lamp yields cw-Cl 2 Pt(PPh 3) 2 . The ylide complexes 4 and 6 were prepared by treatment of 3 with (Me2N) 3 P or Ph 3 As. 3 and Ph 2 P(CH 2) 2 PPh 2 form the chelate ylide com-plex 6. 
  Reference    Z. Naturforsch. 36b, 1663—1665 (1981); eingegangen am 26. August 1981 
  Published    1981 
  Keywords    Phosphorus Ylide Complexes, Synthesis, NMR Spectra 
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 Identifier    ZNB-1981-36b-1663_n 
 Volume    36 
22Author    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 
23Author    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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 Identifier    ZNB-1982-37b-0508 
 Volume    37 
24Author    Fritz Preuss, Lothar OggerRequires cookie*
 Title    Alkylvanadium( V) -Verbindungen Darstellung und NMR-spektroskopische Untersuchungen Alkylvanadium(V) Compounds S\ T nthesis and NMR Spectroscopic Studies  
 Abstract    The compounds Li["C4H9V0(0«C4H9)3], Me3SiCH2V(0<C4H9)3, (CH3)2V(OSiMe3)2 and V(0'C4Hg)4 have been prepared by reaction of esters VO(OR)3(R = J C4H9, SiMes) with lithium alkyls. RV0(0'C4H9)2 species are not formed by direct alkylation of VO(O f C4H 9)3 with LiR; albeit in small yields, these compounds (R = CH3, CH 2 SiMe3) can be synthesized however from V0(0«C4H9)2C1. The 51 V, and 13 C NMR spectra of the vanadium(V) and vanadium(IV) compounds are discussed; the constants of 51 V, iH and 51 V, 13 C coupling have been determined. 
  Reference    Z. Naturforsch. 37b, 957—964 (1982); eingegangen am 15. Februar 1982 
  Published    1982 
  Keywords    Alkylvanadium(V) Compounds, Preparation, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0957.pdf 
 Identifier    ZNB-1982-37b-0957 
 Volume    37 
25Author    OttoJ. Scherer, Klaus-Dieter KriegerRequires cookie*
 Title    Diazadiphosphetidine Platinum(O) Complexes  
 Abstract    The reaction of Pt(COD)2 with cw-[RPNCR3]2 (1), R = CH3, affords the two-coordinate platinum(O) complex PtLo (2) (L = diazadiphosphetidine 1). In benzene solution PtL2, Pt2L3 (3) and L are in equilibrium. 2 and diphenylacetylene or fumaric acid dinitrile give the platinum diazadiphosphetidine complexes LoPt(PhCCPh) (4) and L2Pt[H(NC)CC(CN)H] (5), L = 1. 
  Reference    Z. Naturforsch. 37b, 1041—1043 (1982); eingegangen am 17. Februar 1982 
  Published    1982 
  Keywords    Diazadiphosphetidine Complexes, Synthesis, Reactions, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1041.pdf 
 Identifier    ZNB-1982-37b-1041 
 Volume    37 
26Author    Barteld De Ruiter, Geert Kuipers, JanH. Bijlaart, JohanC. Van De GrampelRequires cookie*
 Title    Derivatives of NPC12(NS0C1)2 and (NPC12)2NS0C1, Part XX [1] Reactions of Some Inorganic Ring Systems with N,N' -Dimethylethylenediamine  
 Abstract    Reactions of the ring systems (NPC12)3, (NPCl2)2NSOX, and NPC12(NS0X)2 (X = Cl, Ph) with N,N'-dimethylethylenediamine lead to mono-, bis-, and tris(spirocyclic) com-pounds as the only characterizable products. The X H and 31 P NMR parameters are re-ported and briefly discussed. 
  Reference    Z. Naturforsch. 37b, 1425—1429 (1982); received June 18 1982 
  Published    1982 
  Keywords    Phosphorus-Sulfur-Nitrogen Heterocycles, Diazaphospholidines, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1425.pdf 
 Identifier    ZNB-1982-37b-1425 
 Volume    37 
27Author    Rolf Minkwitz, Rüdiger NaßRequires cookie*
 Title    Spektroskopische Untersuchungen an Monofluorammoniumsalzen Spectroscopic Studies on Monofluorammonium Salts  
 Abstract    The NMR, IR and Raman spectra of several NHaF+X -salts are reported. The prepara-tion of NH3F+SO3CI-and NH3F+SO3F-is described. 
  Reference    Z. Naturforsch. 37b, 1558—1563 (1982); eingegangen am 21. Juli 1982 
  Published    1982 
  Keywords    NMR Spectra, Raman Spectra, IR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1558.pdf 
 Identifier    ZNB-1982-37b-1558 
 Volume    37 
28Author    Jörn Müller, Wolfgang Hähnlein, Barbara PassonRequires cookie*
 Title    TT-Olefin-Iridium-Komplexe, IX [1] Bis(?y 4 -butadien)-(7-organyl-iridium-Verbindungen TI-Olefin Iridium Complexes, IX [1] Bis(fy 4 -butadiene)-cr-organyl-iridium Compounds  
 Abstract    Complexes of the type [L2IrR] (L = butadiene, isoprene, piperylene, 1,4-and 2,3-dimethylbutadiene; R = CH3, CeHs) have been synthesized by reactions of [L2IrCl] with LiR in hexane. With L = 2,3-dimethylbutadiene, [L2IrR] compounds with higher alkyl groups R (e.g. n-C3H7, n-CjHg) can be obtained which for steric reasons are inert against ^-elimination. Th© system [L2IrCl]/L/LiAlH4 (L = 2,3-dimethylbutadiene) yields [L2IrR] with R = 2,3-dimethylbutene-2-yl. The complexes were characterized by NMR and mass spectra. 
  Reference    Z. Naturforsch. 37b, 1573—1579 (1982); eingegangen am 8. Juli 1982 
  Published    1982 
  Keywords    Synthesis, Mass Spectra, NMR Spectra, yr-Olefm Iridium Complexes 
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 Identifier    ZNB-1982-37b-1573 
 Volume    37 
29Author    Herman Winter, JohanC. Van De GrampelRequires cookie*
 Title    Derivatives of NPCI^NSOCl), and (NPC12)2NS0C1, Part XXI [1]. The Synthesis of a Spiro Phosphazene Derivative of NPCl^NSOPh^  
 Abstract    The preparation of the spirocyclic compounds eis-and £rans-NP[(NPCl2)2NCH3](NSOPh)2 from eis-and Zrans-NPCl2(NSOPh)2 is described as well as the synthesis of the inter-mediates. The 31 P NMR data are discussed. 
  Reference    (Z. Naturforsch. 38b, 7 [1983]; received August 23 1982) 
  Published    1983 
  Keywords    Phosphorus-Sulfur-Nitrogen Heterocycles, Spirocyclic Derivatives, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0007.pdf 
 Identifier    ZNB-1983-38b-0007 
 Volume    38 
30Author    Dieter Weber, Karl Peters, Hans Georg, Schnering, Ekkehard FluckRequires cookie*
 Title    Kristallstruktur yon Pyrrolidinium-bis(diisopropylphosphinoyl)phosphid, einem System mit zweifach koordiniertem Phosphor Crystal Structure of Pyrrolidinium-bis(diisopropylphosphinoyl)phosphide, a System with Bicoordinated Phosphorus  
 Abstract    Pyrrolidinium-bis(diisopropylphosphinoyl)phosphide crystallizes triclinically in the space group Pi with a = 1019.6(8), b = 1271.5(4), c = 999.5(7) pm, a = 100.90(5)°, ß = 91.24(5)°, y = 99.10(5)° and Z = 2 formula units. The mean P-P bond length is 212.2 pm and hence shorter than in derivates in which the electron pairs of the bicoordi-nated phosphorus atom are bonded to one or two M(CO)5-groups. Additional p.-z-d* bonding explains the shortening of the P-P bond. 
  Reference    Z. Naturforsch. 38b, 208—211 (1983); eingegangen am 13. Oktober 1982 
  Published    1983 
  Keywords    Pyrrolidinium-bis(diisopropylphosphinoyl)phosphide, Crystal Structure, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0208.pdf 
 Identifier    ZNB-1983-38b-0208 
 Volume    38 
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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 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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 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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 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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 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 
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