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'Vibrational Spectra' in keywords Facet   Publication Year 1992  [X]
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1992[X]
1Author    H. PreutRequires cookie*
 Title    Umsetzungen  
 Abstract    von Methylphosphanen (CH3)nPCl3_/I (/i = 1 -3) mit Methylchlorsulfan und Kristallstrukturen von (CH3)3PSCH3+I_ und CH3P(SCH3)Cl2+SbCl6-R eactions o f M ethylphosphines (C H 3)"PC13_" (n = 1 -3) w ith M ethylchlorosulfane and C rystal S tructures o f (C H 3)3P S C H 3+I~ and C H 3P (S C H 3)C l2+SbC l6-R olf M inkw itz*, G e rn o t M edger, R üdiger G re th The new thiophosphonium com pounds (C H 3)"P(SCH3)C13_"+C r (n = 1 -3) are prepared by reaction o f methylphosphines (C H 3)"PC13_" (n = 1 -3) with C H 3SC1 in C H 2C12. C H 3P(SCH3)C12+C1-reacts with A1C13 or SbCl5 to give the tetrachloroaluminate and the hexachloroantimonate, respectively. Likewise (C H 3)2P(SCH3)C l+SbCl6~ is formed from the chloride and SbCl5. All com pounds are characterized by vibrational and N M R spectroscopy. C H 3P(SCH3)Cl2+SbCl6" crystallizes in the m onoclinic space group P 2,/« with a = 929(2), b = 1095(2), c = 1436(3) pm, ß = 93,1(2)° and Z = 4. (C H 3)3PSCH 3+L crystallizes in the same space group with a = 705,2(4), b = 1360,6(8), c = 941,8(4) pm, ß = 93,85(4)° and Z = 4. 
  Reference    Z. Naturforsch. 47b, 1653—1660 (1992); eingegangen am 3. Juni 1992 
  Published    1992 
  Keywords    Preparation, Vibrational Spectra, N M R Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1653.pdf 
 Identifier    ZNB-1992-47b-1653 
 Volume    47 
2Author    Z. NaturforschRequires cookie*
 Title    Schwingungsspektren und Kraftfeldberechnungen an Fluorphosphoniumkationen PX4_"F"+ (X = H, D; n = 0 -4 )  
 Abstract    V ibrational Spectra and F orce-F ield-C alculations o f F lu o ro p h o sp h o n iu m C ations PX 4_"F"+ (X = H , D; n = 0 -4) R o lf M inkw itz3 *, D irk L e n n h o ff1, W olfgang S aw odnyb und H einz H ä rtn e rb The vibrational spectra o f all members o f the fluorophosphonium cation series are reported, including the protonated and deuterated species PX 4_"F"+ (X = H, D; n = 0 -4) . The un­ equivocal assignment o f the vibrations follow s from the isotopic shifts and by means o f force field calculations. Furthermore, the force constants are discussed for the complete series. 
  Reference    Z. Naturforsch. 47b, 1661—1666 (1992); eingegangen am 29. Juli 1992 
  Published    1992 
  Keywords    Fluorophosphonium Cations, Vibrational Spectra, Force-Field-Calculations 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1661.pdf 
 Identifier    ZNB-1992-47b-1661 
 Volume    47 
3Author    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 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0482.pdf 
 Identifier    ZNB-1992-47b-0482 
 Volume    47 
4Author    Klaus-Jürgen Range, Peter Rögner, A. Nton, M. Heyns, LindaC. PrinslooRequires cookie*
 Title    An X-Ray, Raman and IR Study of a-C sR e04, the High-Temperature Modification of Cesium Perrhenate  
 Abstract    Cesium perrhenate undergoes a reversible phase transition from the orthorhom bic room-temperature phase (/?-CsRe04, space group Pnma) to a tetragonal high-temperature phase (a -C sR e 0 4). The space group o f a -C sR e 0 4 was unam biguously confirmed by high-tempera-ture X-ray diffraction to be 14 Jamd in contrast to the earlier literature, in which space group 14 Ja (and hence, a scheelite type structure) was assumed for a -C sR e 0 4. From a data set ob­ tained at 468 K the crystal structure o f a -C sR e 0 4 (a = 5.9607(4), c = 14.446(1)Ä, Z = 4) was refined to R = 0.032, Rw = 0.029 using anisotropic displacement factors. In the vibrational spectra not all o f the predicted com ponents for /?-C sR e04 could be con­ firmed by the experiments, but for a -C sR e 0 4 very good agreement was obtained between the predicted and observed bands. The fact that v2 at ~ 3 0 0 cm "' is not observed in the IR spectra o f a -C sR e 0 4 confirms the space group 14Jamd, since, under 14,/a symmetry, this band is allowed. The structure o f a -C sR e 0 4 consists o f isolated R e 0 4 tetrahedra which are linked together by cesium atoms. The relationships between the scheelite, a -C sR e 0 4 and /?-C sR e04 structural types are discussed. 
  Reference    Z. Naturforsch. 47b, 1513—1520 (1992); received June 15 1992 
  Published    1992 
  Keywords    Cesium Perrhenate, High-Temperature M odification, Crystal Structure, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1513.pdf 
 Identifier    ZNB-1992-47b-1513 
 Volume    47 
5Author    G. Ottfried Pawelke, Ralph Dammei, Wolfgang PollRequires cookie*
 Title    Darstellung von Difluormethanimin F2C = N H und F2C = N D durch Hydrolyse von CF3NCO Preparation of Difluoromethanimine F 2C = NH and F 2C = ND by Hydrolyses of C F 3NCO  
 Abstract    The title com pounds have been prepared by controlled hydrolysis o f C F 3NCO in N E t3. Their 13C, 19F and 'H N M R spectra are reported and their IR gas and IR matrix spectra are discussed in terms o f a normal coordinate analysis. The photoelectron spectrum o f F2C = NH is compared with those o f F2C = N F and H 2C = N H revealing a strong fluoro effect. In the solid state F2C = N H is aggregated to infinite zig-zag chains by N • • • H hydrogen bonding. 
  Reference    Z. Naturforsch. 47b, 351 (1992); eingegangen am 17. September 1991 
  Published    1992 
  Keywords    D ifluoromethanimine, N M R Spectra, Vibrational Spectra, Photoelectron Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0351.pdf 
 Identifier    ZNB-1992-47b-0351 
 Volume    47 
6Author    W. Preetz, M. M. AntheyRequires cookie*
 Title    Schwingungsspektren und Normalkoordinatenanalyse der Bromo-Iodo  
 Abstract    Osmate(IV), [O sB r ^ J 2-, n = 0 -6 V ibrational S pectra and N o rm al C oordinate A nalysis o f B rom o-Iodo-O sm ates(IV), [OsBr"I6_"]2-, n = 0 -6 The IR and Raman spectra o f the ten brom o-iodo-osm ates(IV) [OsBr"I6_n]2-, n = 0 -6 , in­ cluding the geometrical isomers for n = 2, 3, 4, have been recorded at low temperature. The vibrational spectra are completely assigned according to point groups Oh, D 4h, C4v, C3v, and C2v, as supported by normal coordinate analyses based on a general valence force field. D ue to the different mzns-influences B r < I in asymmetric axes B r '-O s -I ', the O s -I ' bonds are strengthened and the O s-B r' bonds are weakened, as indicated by valence force constants, for O s -I ' on average 4% higher and for O s-B r' 4% lower, as compared with the values calculat­ ed for symmetric I -O s -I and B r -O s —Br axes, respectively. 
  Reference    Z. Naturforsch. 47b, 1667—1672 (1992); eingegangen am 10. August 1992 
  Published    1992 
  Keywords    Brom o-Iodo-Osm ates(IV), Stereoisomers, mms-Influence, Vibrational Spectra, Norm al Coordinate Analysis 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1667.pdf 
 Identifier    ZNB-1992-47b-1667 
 Volume    47