Schwingungsspektren und Normalkoordinatenanalyse der Bromo-Iodo-Osmate(IV), [OsBrnI6-n]2-, n = 0-6 / Vibrational Spectra and Normal Coordinate Analysis of Bromo-Iodo-Osmates(IV), [OsBrnI6-n]2-, n = 0-6

1992 ◽  
Vol 47 (12) ◽  
pp. 1667-1672 ◽  
Author(s):  
W. Preetz ◽  
M. Manthey
Keyword(s):  
Low Temperature ◽  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate ◽  
Geometrical Isomers ◽  
Valence Force ◽  
Valence Force Field ◽  
Point Groups ◽  
Ir And Raman

The IR and Raman spectra of the ten bromo-iodo-osmates(IV) [OsBrnI6-n]2-, n = 0-6, including 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, D4h, C4v, C3v, and C2v, as supported by normal coordinate analyses based on a general valence force field. Due to the different trans-influences Br<I in asymmetric axes Br′–Os–I′, the Os–I′ bonds are strengthened and the Os–Br′ bonds are weakened, as indicated by valence force constants, for Os–I′ on average 4% higher and for Os–Br′ 4% lower, as compared with the values calculated for symmetric I–Os–I and Br–Os–Br axes, respectively.

scholarly journals Darstellung, schwingungsspektren und Normalkoordinatenanalyse der Bromo-Iodo-Rhenate(IV), [ReRrnI6-n]2-, n = 0-6 / Preparation, vibrational spectra, and normal coordinate analysis of bromo-iodo-rhenates(iv), [ReRrnI6-n]2-, n = 0-6

1994 ◽  
Vol 49 (6) ◽  
pp. 753-758 ◽  
Author(s):  
P. Prillwitz ◽  
W. Preetz
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Ir And Raman Spectra ◽  
Normal Coordinate ◽  
Geometrical Isomers ◽  
Valence Force ◽  
Valence Force Field ◽  
Point Groups ◽  
Ir And Raman

The IR and Raman spectra of the ten bromo-iodo-rhenates(IV) [ReBrnI6-n]2-, n = 0 -6 , including the geometrical isomers for n - 2,3,4, have been recorded at 80 K. The vibrational spectra are completely assigned according to point groups Oh, D4h, C4v, C3v, and C2v, as supported by normal coordinate analyses based on a general valence force field. Due to the different mms-influences Br < I in asymmetric axes Br•-Re-I', the Re-I' bonds are strengthened and the Re-Br• bonds are weakened, as indicated by valence force constants, for Re-I' on average 8,5% higher and for Os-Br• 8,3% lower, as compared with the values calculated for symmetric I-Re-I and Br-Re-Br axes, respectively

scholarly journals Schwingungsspektren und Normalkoordinatenanalyse der Chloro-Bromo-Osmate(IV), [OsCl„Br6-n]2-, n = 0-6 / Vibrational Spectra and Normal Coordinate Analysis of Chloro-Bromo-Osmates(IV), [OsCl„Br6-n]2-, n = 0-6

1990 ◽  
Vol 45 (3) ◽  
pp. 283-289 ◽  
Author(s):  
W. Preetz ◽  
K. Irmer
Keyword(s):  
Low Temperature ◽  
Force Field ◽  
Vibrational Spectra ◽  
Normal Coordinate ◽  
Geometrical Isomers ◽  
Valence Force ◽  
Valence Force Field ◽  
Trans Influence ◽  
Point Groups ◽  
Ir And Raman

The IR- and Raman spectra of the ten chloro-bromo-osmates(IV) [OsCl„Br6-n]2-, n = 0-6, including the geometrical isomers for n = 2, 3, 4 have been recorded at low temperature (80 K). The vibrational spectra of these complexes are completely assigned according to point groups Oh, D4h, C4v, C3v and C2v, supported by normal coordinate analyses based on a general valence force field. Due to the stronger trans-influence of Br as compared to Cl, in all asymmetric Cl—Os—Br axes the Os—Br bonds are strengthened and the Os—Cl bonds are weakened, indicated by valence force constants for Os— Br approximately 6% higher, for Os—Cl 6% lower, as compared with the values calculated for symmetrical Br—Os—Br and Cl-Os-Cl axes, respectively. The significantly stronger interaction between opposite bonds is revealed by the stretching interaction constants fdd, which are about three times larger than fdd for bonds at right angles.

Studies of silyl and germyl group VI species. Part VI. Synthesis and vibrational spectra of methylthiosilanes

1981 ◽  
Vol 59 (19) ◽  
pp. 2909-2920 ◽  
Author(s):  
John E. Drake ◽  
Boris M. Glavinčevski ◽  
Layla N. Khasrou
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Ir And Raman Spectra ◽  
Normal Coordinate ◽  
Group Vi ◽  
Valence Force ◽  
Valence Force Field ◽  
Ir And Raman

Methylthiosilanes of the type (CH3)nH3−nSiSCH3, n = 0–3, and (CH3)HSi(SCH3)2 have been prepared. Their ir and Raman spectra were recorded and assigned. The assignments were supported by normal coordinate analyses based on a modified valence force field.

scholarly journals The Vibrational Spectra of Silane and Germane Derivatives. Part IV. The Infrared and Raman Spectra of the Iodo(methyl)germanes

1971 ◽  
Vol 49 (18) ◽  
pp. 2931-2936 ◽  
Author(s):  
J. W. Anderson ◽  
G. K. Barker ◽  
J. E. Drake And ◽  
R. T. Hemmings
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
A Priori ◽  
Normal Coordinate Analysis ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Fundamental Frequencies

The infrared and Raman spectra of the series of iodo(methyl)germanes, CH3GeI3, (CH3)2GeI2, and (CH3)3GeI have been recorded. A normal coordinate analysis based on a modified valence force field confirms the a priori assignments for all of the fundamental frequencies except the torsional modes.

The vibrational spectra of some phenylmercuric halides and diphenylmercury

1977 ◽  
Vol 30 (9) ◽  
pp. 1905 ◽  
Author(s):  
CG Barraclough ◽  
GE Berkovic ◽  
GB Deacon
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
Phenylmercuric Chloride ◽  
Good Agreement

The Raman spectra of phenylmercuric chloride, phenylmercuric bromide, phenylmercuric iodide and diphenylmercury, and the infrared and Raman spectra of diphenylmercury in solution are reported. Using the previously reported infrared spectra of these compounds, vibrations were assigned, normal coordinate analyses were performed and frequencies were calculated using a valence force field. Good agreement was achieved between observed and calculated frequencies. The structure of diphenyl-mercury in solution is discussed.

Schwingungsspektren und Kraftkonstanten der Hexacyano-Komplexe des Mangan(I), Technetium(I) und Rhenium(I) / Vibrational Spectra and Force Constants of the Hexacyano Complexes of Mangan(l), Technicium(I) and Rhenium(l)

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1193-1196 ◽  
Author(s):  
W. Krasser ◽  
K. Schwochau
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Point Group ◽  
Force Constants ◽  
Irreducible Representations ◽  
Infrared And Raman Spectra ◽  
Valence Force ◽  
Valence Force Field ◽  
Complex Salts

The infrared and Raman spectra of the complex salts K5[Mn(CN)6], K5[Tc(CN)6] and K5[Re(CN)s] have been recorded in the range from 4000 to 40 cm-1. All expected fundamental vibrations have been observed and could be assigned to the irreducible representations of the sym­metry point group Oh . The calculation of the force constants is based on the concept of the generalized valence force field. The low CN-valence force constants indicate the relatively strong Π-bonding character of the metal carbon bond, which is especially pronounced for K5[Tc(CN)6).

Perfluormethyl-Element-Liganden, XI Die Schwingungsspektren von (CF3)2EMn(CO)5 (E=P, As) / Perfluoromethyl Element Ligands, XI. Vibrational Spectra of (CF3)2EMn(CO)5 (E = P, As)

1975 ◽  
Vol 30 (7-8) ◽  
pp. 539-543 ◽  
Author(s):  
Reinhard Demuth ◽  
Joseph Grobe ◽  
Robert Rau
Keyword(s):  
Liquid Phase ◽  
Force Field ◽  
Gas Phase ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Normal Coordinate Analysis ◽  
Ir And Raman Spectra ◽  
Normal Coordinate ◽  
Ir And Raman

The gas phase IR and liquid phase IR and Raman spectra of (CF3)2PMn(CO)5 and (CF3)2AsMn(CO)6 have been recorded. The spectra are assigned on the basis of a normal coordinate analysis using a transferred force field.

Vibrational Spectra and Normal Coordinate Calculations of Chlorophosphazene Compounds. III. Polydichlorophosphazene

1982 ◽  
Vol 36 (3) ◽  
pp. 277-281 ◽  
Author(s):  
M. M. Coleman ◽  
J. Zarian ◽  
P. C. Painter
Keyword(s):  
Force Field ◽  
Vibrational Spectra ◽  
Reasonable Agreement ◽  
Normal Modes ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field

Vibrational spectra and normal coordinate calculations of polydichlorophosphazene (PDP) are presented. The valence force field derived previously from the two conformers of octachlorocyclotetraphosphazene was directly transferred to a distorted “cis-plan” helical model of PDP without refinement. A reasonable agreement between the observed and calculated frequencies was obtained and the assignment of the normal modes of PDP is discussed.

Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der Chloro-Bromo-Technetate(IV), [TcCl„Br6_n]2-, n = 0-6 / Preparation, Vibrational Spectra and Normal Coordinate Analysis of Chloro-Bromo-Technetates(IV), [TcCln Br6-n]2-, n = 0-6

1991 ◽  
Vol 46 (11) ◽  
pp. 1496-1502 ◽  
Author(s):  
W. Preetz ◽  
A. Wendt
Keyword(s):  
Exchange Chromatography ◽  
Normal Coordinate Analysis ◽  
Exchange Reactions ◽  
Normal Coordinate ◽  
Geometrical Isomers ◽  
Valence Force ◽  
Diethylaminoethyl Cellulose ◽  
Point Groups ◽  
First Time ◽  
Ir And Raman

The mixed chloro-bromo-technetates(IV), [TcClnBr6-n2-, n = 1-5, have been separated for the first time by ion exchange chromatography on diethylaminoethyl-cellulose. Due to the stronger trans-effect of Br as compared to Cl, the ligand exchange reactions of [TcBr62- with HCl and of [TcCl6]2- with HBr proceed stereospecifically, to form either cis/fac- or trans/merspecies for n = 2, 3, 4, respectively. To avoid photoisomerization the compounds have to be handled in the absence of light. The IR and Raman spectra of the ten chloro-bromo-techne-tates(IV), including the pure geometrical isomers, have been recorded at low temperature (80 K) and completely assigned to structures of point groups Oh, D4h, C4v, C3v, and C2v, supported by normal coordinate analysis based on a general valence force field. Due to the different trans-influences Cl &lt; Br in asymmetric Cl′—Tc— Br′ axes, the Tc— Br′ bonds are strengthened and the Tc—Cl′ bonds are weakened, as indicated by valence force constants, for Tc—Br′ on average 6% higher and for Tc—Cl′ 10% lower, as compared with the values calculated for symmetric Br—Tc—Br and CI—Tc—Cl axes, respectively.

Darstellung und spektroskopische Charakterisierung der Oxorhenate(V), [ReOI4]–und [ReO(SCF3)4]–/ Preparation and Spectroscopic C haracterization of the Oxorhenates(V), [ReOI4]–and [ReO(SCF3)4]–

1993 ◽  
Vol 48 (1) ◽  
pp. 44-47 ◽  
Author(s):  
W. Preetz
Keyword(s):  
Force Field ◽  
Vibrational Spectra ◽  
Ligand Exchange ◽  
Nmr Spectra ◽  
Point Group ◽  
Exchange Reactions ◽  
Normal Coordinate ◽  
Valence Force ◽  
Valence Force Field ◽  
First Time

By ligand exchange reactions of (n-Bu4N )[ReOBr4] with NaI dissolved in acetone pure (n-Bu4N )[ReOI4], and with AgSCF3 suspended in dichloromethane (n-Bu4N )[ReO(SCF3)4] have been prepared for the first time. The vibrational spectra of both complexes are assigned according to point group C4v, supported by normal coordinate analysis based on a general valence force field. 13C and ,19F NMR spectra provide evidence for the equivalence o f the SCF3 groups.

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