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'IR spectra' in keywords Facet   Publication Year 1987  [X]
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1987[X]
1Author    J. Fritze, W. PreetzRequires cookie*
 Title    c/osö-Halogenohydrohexaborate, III Schwingungsspektren der c/oso-Halogenohydrohexaborate X"B  
 Abstract    ~, n = 1-5; X = Cl, Br, I c/oso-Halogenohydrohexaborate, III Vibrational Spectra of the c/oso-Halogenohydrohexaborates X"B 6 H 6 _" 2_ , n = 1-5; X = Cl, Br, I The IR and Raman spectra of 20 different halogenohydrohexaborates, including pairs of geometric isomers of the series X"B 6 H 6 _ n :_ , X = Cl, Br, I; n = 1—5, have been assigned according to their point groups D 4h , C 4v , C 3v and C 2v determined previously by NMR studies. Due to weak coupling, the vibrations are treated separately to a first approximation in terms of internal B 6 -cage modes on one hand and modes of the substituents against the cage entity on the other hand. Disregarding the splitting by lowered symmetry, depending on the degree of halogenation, all internal modes of the B 6 cluster are observed at nearly unchanged positions in the range of 450—1250 cm -1 . The B 6 —X stretching vibrations, however, exhibit significant shifts to lower energy with increasing mass of substituents. 
  Reference    Z. Naturforsch. 42b, 293—300 (1987); eingegangen am 21. November 1986 
  Published    1987 
  Keywords    Halogenohydrohexaborates, IR Spectra, Raman Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0293.pdf 
 Identifier    ZNB-1987-42b-0293 
 Volume    42 
2Author    Bernd RebenstorfRequires cookie*
 Title    Über die Reaktion von Chromocen mit einem Co/Kieselgel-Träger On the Reaction of Chromocene with a Co/Silica Gel Support  
 Abstract    The IR spectra of the modified chromocene/Co/silica gel catalyst show a band at 3118 cm" 1 of the cyclopentadienyl ligand, which is shifted by —1-20 cm' 1 compared to the unmodified chromocene/silica gel catalyst. The comparably slow CO adsorption yields two bands at low Cr concentration (—0.1% Cr) at 2065 and 2022 cm" 1 and two more at higher Cr concentration (—1% Cr) at 2028 and 1961 cm -1 . Both band pairs are significantly different from that observed with the "normal" chromocene/silica gel catalyst at 2046 and 1974 cm -1 . No CO IR bands at low wavenumbers were observed with the modified catalyst. Polymerisation measurements showed a slightly lower concentration of catalytically active sites (35% of Cr) for the modified catalyst compared to the unmodified one (50%), while the poly-merisation activity decreased by a factor of four (Cr concentration: 0.083%). It was concluded that the surrounding of the dimeric surface site is changed by Co on the silica gel surface of the chromocen catalyst and that this change is important for the CO adsorption and the polymerisation activity. 
  Reference    Z. Naturforsch. 42b, 764—768 (1987); eingegangen am 18. Dezember 1986 
  Published    1987 
  Keywords    Silica Gel Cobalt(II), Chromocene, IR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0764.pdf 
 Identifier    ZNB-1987-42b-0764 
 Volume    42 
3Author    Kay Jansen, Kurt DehnickeRequires cookie*
 Title    Synthese und Kristallstruktur von (PPh4)2[Mo2(02C—Ph)4Cl4] * 2 CH2C12, einem Komplex mit Mo=Mo-Bindung Synthesis and Crystal Structure of (PPh4 )2 [Mo2 (0 2 C —Ph)4 Cl4] -2 CH 2 C12, a Complex with M o=M o Bonding  
 Abstract    The title com pound has been prepared from (PPh4)2[M o2(0 2C —Ph)4Cl2] and CC14 in C H 2C12 solution as moisture sensitive crystals, which are black in reflexion and yellow in transmission. (PPh4)2[M o2(0 2C —Ph)4Cl4] • 2 C H 2C12 was characterized by a X-ray crystal structure determ ination (7873 observed independent reflexions, R = 0.048). It crystallizes in the space group P 1 with one formula unit in the unit cell; the lattice constants are a = 1186.4; b = 1404.0; c = 1451.0 pm; a = 61.98°; ß = 78.91°; y = 78.26°. The structure consists o f PPh4® ions, C H 2C12 m olecules and centrosym m etric anions [M o2(0 2C —Ph)4Cl4]20 containing a molybdenum d3d3 unit with a relatively long M o = M o bond o f 249.6 pm. The M o= M o group is spanned in a chelate manner by four O atoms of two benzoate groups and by two further single O atoms o f two further benzoate groups. Two terminal Cl atom s on each Mo atom com plete the pentagonal bipyramidal coordination spheres about the Mo atoms. 
  Reference    Z. Naturforsch. 42b, 1097—1101 (1987); eingegangen am 2. März 1987 
  Published    1987 
  Keywords    Tetrabenzoato-tetrachloro-dim olybdate, Synthesis, IR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1097.pdf 
 Identifier    ZNB-1987-42b-1097 
 Volume    42 
4Author    Hidenari Inoue, Takashi Nakagome, Takeshi Kuroiwa, Tsuneo Shirai, Ekkehard FluckRequires cookie*
 Title    Infrared, 57 Fe Mössbauer, and 31 P NMR Spectroscopic Characterization of Fe(CO) 4 L (L = Phosphine and Phosphite)  
 Abstract    A series of trigonal bipyramidal Fe(CO) 4 L complexes has been prepared and characterized by infrared, 57 Fe Mössbauer and 31 P NMR spectroscopy. A linear correlation, with a negative slope, between the CO stretching frequencies and the isomer shifts demonstrates that the triple bond nature of the carbonyl ligands is strengthened with increasing iron-to-phosphorus back donation. The linear dependence of the quadrupole splittings on the isomer shifts with a positive slope has revealed that the cr-donor capability of the phosphine or phosphite ligand is offset by the ^ • -acceptor capability. The formation of Fe(CO) 4 L complexes from the corresponding free ligands is accompanied by a downfield shift of 31 P NMR chemical shifts. The coordination shifts are linearly correlated with the Mössbauer isomer shifts. 
  Reference    Z. Naturforsch. 42b, 573—578 (1987); eingegangen am 8. Januar 1987 
  Published    1987 
  Keywords    Phosphinetetracarbonyliron, Phosphitetetracarbonyliron, IR Spectra, 31 P NMR Spectra, 57 Fe Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0573.pdf 
 Identifier    ZNB-1987-42b-0573 
 Volume    42 
5Author    H. G. Alt, H. E. EngelhardtRequires cookie*
 Title    Bis-acetylene Complexes of Niobium and Tantalum  
 Abstract    The photo-induced reaction of C 5 Me 5 M(CO) 4 complexes (M = Nb, Ta) with excess alkynes R'C 2 R : (R\ R 2 = H, Me, Ph, Hex) in pentane solution results in the formation of the bis-acetylene complexes C 5 Me 5 M(R'C 2 R 2) 2 CO. In these complexes the jr-bonded acetylene ligands behave formally as three electron ligands. 
  Reference    Z. Naturforsch. 42b, 711—714 (1987); eingegangen am 10. Dezember 1986/23. Januar 1987 
  Published    1987 
  Keywords    Bis-acetylene Complexes of Niobium and Tantalum, IR Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0711.pdf 
 Identifier    ZNB-1987-42b-0711 
 Volume    42 
6Author    Lothar Weber, Georg MeineRequires cookie*
 Title    Zur Reaktivität von Diphosphenylkomplexen des Eisens und Rutheniums gegenüber Tetracarbonylnickel Transition Metal Substituted Diphosphenes, VI [1] On the Reactivity of Diphosphenyl Complexes of Iron and Ruthenium towards Tetracarbonyl Nickel  
 Abstract    The diphosphenyl complexes (?/ 5 -CsMe0(CO 2)M-P = P-Ar (8) (M = Fe, Ru; Ar = 2,4,6-rm-BU,C 6 H 2) react with excess Ni(CO) 4 to yield the adducts (77 5 -C 5 Me 5)(CO) 2 M[Ni(CO) 3 ]P=PAr (9). The products have been characterized by elemental analysis as well as by spectroscopic data (IR. 'H, 13 C, 31 P NMR). 
  Reference    Z. Naturforsch. 42b, 774—776 (1987); eingegangen am 26. Januar 1987 
  Published    1987 
  Keywords    Metal Substituted Diphosphenes, Tetracarbonyl Nickel, NMR Spectra, IR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0774.pdf 
 Identifier    ZNB-1987-42b-0774 
 Volume    42 
7Author    Somluck Ruangsuttinarupap, Claus Friebel, Kurt DehnickeRequires cookie*
 Title    Synthese, IR-, EPR-und Elektronenspektren der Dischwefel-dinitrid-Komplexe [CUC1 2 (CH 3 CN)] 2 -(/I-S 2 N 2 ) und [CuCl 2 ] 2 * (/I-S 2 N 2 ) Synthesis, IR, EPR, and Electronic Spectra of the Disulfur Dinitride Complexes [CUC1 2 (CH 3 CN)] 2 * (w-S 2 N 2 ) and [CuCl 2 ] 2 -(w-S 2 N 2 )  
 Abstract    [CuCl 2 (CH 3 CN)] 2 -(W-S 2 N 2) is prepared by the reaction of trithiazyl chloride with CuCl in acetonitrile solution. Thermolysis at 120 °C yields [CuCl 2 ] 2 -(W-S 2 N 2). The complexes are charac-terized by their IR, EPR, and electronic spectra. 
  Reference    Z. Naturforsch. 42b, 337—340 (1987); eingegangen am 24. November 1986 
  Published    1987 
  Keywords    Disulfur Dinitride Complexes of Copper(II), EPR Spectra, Electronic Spectra, Synthesis, IR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0337.pdf 
 Identifier    ZNB-1987-42b-0337 
 Volume    42 
8Author    W. Preetz, H.N V AllwördenRequires cookie*
 Title    Darstellung und Schwingungsspektren von Chloro-Bromo-Ruthenaten(IV) einschließlich der Stereoisomeren Preparation and Vibrational Spectra of Chloro-Bromo-Ruthenates(IV) Including Stereoisomers  
 Abstract    The mixed chloro-bromo complexes [RuCl"Br 6 _"] 2_ , n = 1—5, have been separated for the first time by ion exchange chromatography on diethylaminoethylcellulose. Due to the stronger trans-effect of Br compared with Cl, on treatment of [RuBr 6 ] 2 ~ with Cl" in the presence of Br 2 nearly pure ciy//ac-isomers,andbyreactionof [RuCl 6 ] 2 " withBr"/Br 2 nearlypurerran5/mer-isomersforn = 2,3,4 are formed. The vibrational spectra of the mixed ligand complexes are completely assigned according to point groups D 4h , C 4v , C 3v and C 2v , respectively. The bands are observed in the characteristic regions: v(RuCl): 340-270 > v(RuBr): 245-190 > <3(ClRuCl): 170-140 > ö(ClRuBr) > <3(BrRuBr): 125—90 > v L : < 100 cm" 1 . The lower stability of the hexahalogeno complexes of Ru(IV), 4d, compared with the homologous complexes of Os(IV), 5d, is confirmed by a decrease of the force field constants by approximately 15%. 
  Reference    Z. Naturforsch. 42b, 381—386 (1987); eingegangen am 18. Dezember 1986 
  Published    1987 
  Keywords    Chloro-Bromo-Ruthenates(IV), Stereoisomers, r/wis-Effect, IR Spectra, Raman Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0381.pdf 
 Identifier    ZNB-1987-42b-0381 
 Volume    42 
9Author    Guido Effinger, WolfgangH. Iller, Ingo-Peter LorenzRequires cookie*
 Title    Reaktionen  
 Abstract    von Silylphosphanen mit Halogenokomplexen von Übergangsmetallen: Synthese, Struktur und Eigenschaften von Komplexen des Typs cis-X(CO)4Mn{PPh3 _"(SiMe3)/I} (n = 1 -3) und [{Cp(CO)2Fe}2PPhR]X (R = Ph, H) bzw. [{Cp(CO)2Fe}3PH]X (X = CI, Br, I) Reactions of Silylphosphanes with Halogeno Complexes of Transition Metals: Synthesis, Structure and Properties of Complexes c«-X (C O)4 M n{PPh3 _"(SiMe3)"} (n = 1 -3) , [{Cp(CO)2Fe}2 PPhR]X (R = Ph, H) and [{Cp(CO)2Fe}3 PH]X (X = Cl, Br, I) The reactions o f pentacarbonylm anganese halides (C O)5M nX (X = Cl, Br, I) with the silyl­ phosphanes Ph3_"P(SiMe3)" (n = 1—3) at am bient temperature result in the elimination o f one CO ligand and the formation o f cw-configurated substitution products X (C O)4M n{PPh3_"(SiMe3)"}. N o CO -substitution, but M e3SiX-elim ination is observed in the reaction of Ph3_"P(SiMe3)" with the dicarbonylcyclopentadienyliron halides C pFe(C O)2X to give the di-and triferriophosphonium halides [{C p (C O)2F e}2P PhR ]X (R = Ph, H) and [{C p(C O)2F e }3PH]X (X = Cl, Br, I). The mass, IR and NM R spectra are reported and discussed. The crystal structures o f cz's-I(CO)4M nPPh2SiM e3 and [{C p (C O)2F e}2PPh2]I have been determined. 
  Reference    Z. Naturforsch. 42b, 1315 (1987); eingegangen am 30. April 1987 
  Published    1987 
  Keywords    Trimethylsilyl Phosphanes, Substitution R eactions, T etracarbonylhalogenom anganese C om plexes, H alogenosilane Elim ination, IR Spectra 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1315.pdf 
 Identifier    ZNB-1987-42b-1315 
 Volume    42 
10Author    Dieter Fenske, Karin Völp, Kurt DehnickeRequires cookie*
 Title    N-Chlor-Nitrenokomplexe des Molybdäns: M oF4(NC1) und [C H 3C N -M oF4(N C 1)] N-Chloro-Nitrene Complexes o f Molybdenum: M oF 4(NC1) and [C H 3C N -M o F 4(NC1)]  
 Abstract    MoF4(NC1) has been prepared as a yellow crystal powder by the reaction of diluted fluorine with MoCl3(N 3S2) at room temperature. The compound is associated via fluorine bridges, accord­ ing to the IR spectrum. With acetonitrile, the monomeric complex [CH3CN —MoF4(NC1)] is obtained, which was characterized by its IR and l9F N M R spectra as well as by an X-ray structure determination. Crystal data: space group Pm, Z — 2 (1068 observed, independent reflexions, R — 0.03). Lattice dimensions at —90 °C: a — 507.1. b = 704.8, c = 995.8 pm, ß — 102.02°. The unit cell contains two crystallographically independent molecules [CH3CN —MoF4(NC1)], the M o = N —Cl groups being linear (bond angles 176°, 178°) with bond lengths MoN = 172 and NCI = 159. 162 pm. In the trans position to the MoNCl group, the nitrogen atom of the acetonitrile molecule is coordinated. 
  Reference    Z. Naturforsch. 42b, 1398—1402 (1987); eingegangen am 2. Juli 1987 
  Published    1987 
  Keywords    IR Spectra, I9F N M R Spectra, X-Ray, N-Chloro-Nitrene-Molybdenum Tetrafluoride, Acetonitrile Adduct 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1398.pdf 
 Identifier    ZNB-1987-42b-1398 
 Volume    42