Go toArchive
Browse byFacets
Bookbag ( 0 )
'IR spectra' in keywords Facet   Publication Year 1992  [X]
Results  7 Items
Sorted by   
Section
Publication Year
1992[X]
1Author    Rene Wollert, SigridW. Ocadlo, K. Urt Dehnicke, Helmut Goesmann, Dieter FenskeRequires cookie*
 Title    Die Kristallstrukturen von (PPh4)2 [TiCl3 (NSiMe3) ] 2 * CH3CN und (PPh4)2 [TiCl4(OSPCl2) ] 2 The Crystal Structures of (PPh4)2[TiCl3(NSiM e3)]2 -C H 3CN and (PPh4)2[TiCl4(OSPCl2)]2  
 Abstract    (PPh4)2[TiCl3(N SiM e3)]2 C H 3CN has been prepared from [TiCl^NSiM ej)]^ with PPh4Cl in acetonitrile solution as yellow crystals. The com pound crystallizes in the triclinic space group P 1 with one formula unit per unit cell, 3447 observed unique reflections, R = 0.053. Lattice dimensions at 200 K: a = 1030(1), b = 1253(1), c = 1374(1) pm, a = 77.46(8)°, ß = 73.93(8)°, y = 69.99(9)°. The structure consists o f PPh4+ ions and centrosymmetric dimeric anions [TiCl3(N SiM e3)]2~, in which pentacoordinate titanium atom s are associated via the nitrogen atoms o f the silylimido groups. (PPh4)2[TiCl4(OSPCl2)]2 has been prepared by the reaction o f PPh^fOSPClJ with titanium tetrachloride in C H 2C12 solution as orange crystals. (Space group P I , Z = 1, 3242 observed unique reflections, R = 0.033). Lattice dim ensions at 193 K: a = 1114.8(2), b = 1190.6(2), c = 1218.7(2) pm, a = 72.18(1)°, ß = 85.45(1)°, y = 69.19(1)°. The structure consists o f PPh4+ ions and centrosymmetric dimeric anions [TiCl4(O SPCl2)]^~, in which hexacoordinate titanium atom s are associated via two chlorine atoms. The OSPCl2_ group is coordinated via the oxygen atom. 
  Reference    Z. Naturforsch. 47b, 1386—1392 (1992); eingegangen am 9. März 1992 
  Published    1992 
  Keywords    Dimeric Titanium Complexes, Synthesis, IR Spectra, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1386.pdf 
 Identifier    ZNB-1992-47b-1386 
 Volume    47 
2Author    P. H. Ollm, Ann, W. PreetzRequires cookie*
 Title    [Ir2Cl10]2  
 Abstract    , und Normalkoordinatenanalyse an Dioktaederkomplexen des Typs IM2X1012", M = Re, Os, Ir, Pt; X = CI, Br Preparation and Characterization of Decachlorodiiridate(IV), [Ir2C l10]2-, and Normal Coordinate Analysis of Bioctahedral Complexes [M2X 10]2", M = Re, Os, Ir, Pt; X = CI, Br On heating the tetraethylammonium salt o f [IrCl6]2-with trifluoroacetic acid the edge shar­ ing bioctahedral anion [Ir2C l10]2' is formed, the IR and Raman spectra o f which are assigned according to point group D 2h. Norm al coordinate analyses, based on a general valence force field, for [M2X 10]2-, M = Re, Os, Ir, Pt; X = Cl, Br have been performed, resulting in a good agreement o f the calculated frequencies with the bands observed in the IR and Raman spectra. Due to the stronger bonding o f the terminal as compared to the bridging ligands, the valence force constants fd(M X t) are significantly higher than fd(M X b). Darstellung und Charakterisierung von Dekachlorodiiridat(IV), 
  Reference    Z. Naturforsch. 47b, 1115—1118 (1992); eingegangen am 8. April 1992 
  Published    1992 
  Keywords    Decachlorodiiridate(IV), Raman Spectra, IR Spectra, Normal Coordinate Analysis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1115.pdf 
 Identifier    ZNB-1992-47b-1115 
 Volume    47 
3Author    SvenM. Jessen, H. Orst Küppers, DeanC. LuehrsRequires cookie*
 Title    Hydrogen Bonding in Acid Li-, Ni-, Tetrabutylammonium, and Ammonium Salts of Benzene-1,2,4,5-tetracarboxylic Acid (Pyromellitic Acid)  
 Abstract    Four acid salts o f pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid) have been syn­ thesized and studied by X-ray diffraction and IR spectroscopy. (1) Dilithium dihydrogen py-romellitate pentahydrate, Li2[C6H 2(COO)4H 2] • 5 H zO; monoclinic, P 2 1/m, a = 6.214(2), b = 19.647(7), c = 6.592(2)Ä , ß = 115.90(2)°, Z = 2, R = 0.068, Rw = 0.067. (2) Hexaaquanickel dihydrogen pyromellitate, [N i(H 20) 6][C6H 2(C 0 0) 4H2]; monoclinic, P2/m, a = 6.528(1), b = 9.927(2), c = 6.472(1)Ä , ß = 115.57(1)°, Z = 1, R = 0.044, /?w = 0.039. (3) Tetrabutylammoni­ um trihydrogen pyromellitate, [(C4H 9)4N][C6H-,(COO)4H 3]; monoclinic, P 2 ,/c, a = 9.719(4), b = 18.823(8), c = 15.795(5) Ä, ß = 107.42(3)°, Z = 4, R = 0.059, Rw = 0.039. (4) Diam m onium dihydrogen pyromellitate, [N H 4],[C6H ,(CO O)4H2]; monoclinic, P 2 l/c\ a = 4.7665(6), b = 11.681(3), c = 10.149(2) Ä, ß = 102'. 19(2)°, Z = 2, R = 0.045, Rw = 0.039. Com pounds 1, 2, and 3 show very short intramolecular hydrogen bonds between adjacent carboxylic groups (O -O distances 2.384(6), 2.386(5), 2 . 3 8 7 (3) respectively). Com pound 4 forms intermolecular hy­ drogen bonds (O -O distance 2.642(2) A). The different hydrogen bonding modes are also evi­ dent in the IR spectra. 
  Reference    Z. Naturforsch. 47b, 1141—1153 (1992); received October 1 1991 /March 27 1992 
  Published    1992 
  Keywords    Pyromellitates, Hydrogen Bonds, Crystal Structure, Acid Pyromellitates, IR Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1141.pdf 
 Identifier    ZNB-1992-47b-1141 
 Volume    47 
4Author    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 
5Author    Ursula BentrupRequires cookie*
 Title    Über die thermische Zersetzung von N 2H6[CrF5(H20)] und die neue Verbindung N2H6CrF5  
 Abstract    Thermal decomposition of N 2H 6[CrF5(H 20)] has been investigated by thermoanalytical, X-ray and IR spectroscopic methods. U nder quasi-isobaric conditions the decomposition takes place in several steps. The intermediate N 2H 6C rF 5 has been found which crystallizes monoclinically with a = 555.0 pm, b = 1084.6 pm, c = 777.0 pm,/? = 91.76°. N 2H 6C rF 5 decom­ poses via an am orphous intermediate to give pure rhomboedrical C rF 3 as the final product. One of the intermediate has been identified as chrom ium fluoride am moniate C rF 3-0.4 N H 3. No hydrolysis reactions have been observed. 
  Reference    Z. Naturforsch. 47b, 957—961 (1992); eingegangen am 6. Februar 1992 
  Published    1992 
  Keywords    Hydrazinium Pentafluorochrom ates(III), Fluorochrom ates(III), Thermal Decomposition, IR Spectra, X-Ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0957.pdf 
 Identifier    ZNB-1992-47b-0957 
 Volume    47 
6Author    W. Preetz, M. G. HakeRequires cookie*
 Title    Darstellung, "B-NMR-und Schwingungsspektren der ctoso-Hexaborate |B6(SCN)6]J-und [B6(SeCN)6]2  
 Abstract    On treatment o f [N(C4H 9)4][B6H 7] with (S C N)2 or (SeC N)2 in dichloromethane in the pres­ ence o f solid KOH the hexaborates [N(C4H 9)4]2[B6(SC N)6] and [N(C4H9)4]2[B6(SeC N)6] are formed. The octahedral structure for the B6 cage is proven by "B N M R spectroscopy. The chemical shifts in relation to BF3 • OEt2 o f —9,7 (SC N) and -10,2 ppm (SeC N) show the influ­ ence o f -I and +M effects o f the substituents. The S(Se) coordination is deduced from vibra­ tions within the substituents: vCN is observed at frequencies higher than 2100 cm -1 in the IR and Raman spectra, vcs at 662 and vcs at 556 cm "1 (intense IR bands). 
  Reference    Z. Naturforsch. 47b, 1119—1121 (1992); eingegangen am 8. April 1992 
  Published    1992 
  Keywords    Hexathiocyanatohexaborate, H exaselenocyanatohexaborate, 11B N M R Spectra, IR Spectra, Raman Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1119.pdf 
 Identifier    ZNB-1992-47b-1119 
 Volume    47 
7Author    ". B. Preparation, Vibrational, W. PreetzRequires cookie*
 Title    Darstellung, n B-NMR-und Schwingungsspektren der c/öso-Hexaborate Cs2 [B6 H5 (ONO)] und fi7 i/is-Cs2 lB6 H4 (N0 2 )2 ]  
 Abstract    Spectra o f the c/oso-Hexaborates Cs2[B6H 5(ONO)] and /ram'-Cs2[B6H 4(N 0 2)2] M. G. Hake By photochem ical reaction o f Cs2[B6Hg] with K N O z in aqueous alkaline solution the mononitritohydrohexaborate Cs2[B6H 5(ONO)] and the dinitrohydrohexaborate trans-Cs2[B6H4(N 0 2)2] are formed. The pure com pounds have been separated by ion exchange chro­ matography on diethylaminoethyl cellulose. Their structures are proved by "B N M R spectra which show the features o f substituted B6 cages with C4v and D 4h point symmetry. Due to the + M effect o f the nitrito group in contrast to the -M effect o f the nitro substituents character­ istic "B chemical shifts o f opposite sign have been observed. Furthermore, the O or N coordi­ nation is distinguishable by different vibration m odes within the substituents. 
  Reference    Z. Naturforsch. 47b, 1347—1350 (1992); eingegangen am 25. Mai 1992 
  Published    1992 
  Keywords    M ononitritohydrohexaborate, /rans-Dinitrohydrohexaborate, "B N M R Spectra, IR Spectra, Raman Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1347.pdf 
 Identifier    ZNB-1992-47b-1347 
 Volume    47