FT RAMAN AND FTIR SPECTRA OF FOUR DISELENITES PbSe2O5, CdSe2O5, MnSe2O5 and Cr2(Se2O5)3

1999 ◽  
Vol 13 (20) ◽  
pp. 2645-2650 ◽  
Author(s):  
A. BINDU GOPINATH ◽  
S. DEVANARAYANAN

The vibrational spectra of Lead diselenite, Cadmium diselenite, Manganese diselenite and chromium diselenite have been recorded and analysed on the basis of vibrations due to [Formula: see text] ion. The observed spectra clearly indicate the presence of diselenite group in all these compounds. The spectral analysis confirms the orthorhombic nature of MnSe 2 O 5 as suggested by Koskenlinna et al. A large number of vibrational bands in the symmetric stretching region of PhSe 2 O 5 is due to the existence of different Se-O bond lengths. From the spectra it can be seen that the anion is highly distorted angularly in chromium compound. This high distortion in all modes confirms the presence of three crystallographically distinct diselenite groups in chromium compound.

2006 ◽  
Vol 71 (2) ◽  
pp. 207-214
Author(s):  
Ivan Němec ◽  
Zorka Macháčková ◽  
Přemysl Vaněk ◽  
Zdeněk Mička

Piperidinium nitrate was studied by FTIR and FT Raman spectroscopy in the range 100-4000 cm-1 at 300 K. On the basis of DSC measurements which exhibit two effects indicating phase transition at 256 and 295 K, FTIR spectra were recorded down to a temperature of 90 K. Discussion of the phase transition mechanism is based on the observed changes in the FTIR spectra during cooling of the compound.


1990 ◽  
Vol 55 (6) ◽  
pp. 1485-1490 ◽  
Author(s):  
Peter Schwendt ◽  
Milan Sýkora

The infrared and Raman spectra of M2[V2O2(O2)4(H2O)]·xH2O and M2[V2O2(O2)4(D2O)]·xD2O (M = N(CH3)4, Cs) were measured. In the region of the vanadium-oxygen stretching vibrations, the spectra were interpreted based on normal coordinate analysis, employing empirical correlations between the bond lengths and force constants.


Author(s):  
C. Meganathan ◽  
S. Sebastian ◽  
I. Sivanesan ◽  
Keun Woo Lee ◽  
Byoung Ryong Jeong ◽  
...  
Keyword(s):  
Ft Ir ◽  

1974 ◽  
Vol 29 (11-12) ◽  
pp. 806-807 ◽  
Author(s):  
Dietrich Breitinger ◽  
Heiko Leuchtenstern

Chain structure, Force constantsFrom vibrational spectra chain structures are predicted for AuCl and AuBr; bond angles, bond lengths and force constants have been estimated for these aurous halides.


1970 ◽  
Vol 48 (1) ◽  
pp. 181-184 ◽  
Author(s):  
M. H. Abraham ◽  
F. W. Parrett

A study of the low frequency vibrational spectra of the complexes MX2.TMED (where M = Zn, Cd, Hg; X = Cl, Br, I; TMED = N,N,N′,N′-tetramethylethylenediamine suggests that in the solid state the zinc and mercury complexes are 4-coordinated but the cadmium complexes are all based on octahedral halogen bridged structures. Assignments of the vibrational bands are discussed.


1981 ◽  
Vol 59 (18) ◽  
pp. 2737-2745 ◽  
Author(s):  
Helen Elaine Howard-Lock ◽  
Colin James Lyne Lock ◽  
Graham Turner ◽  
Maruta Zvagulis

Crystals of cis-dichlorobis(cyclopropylamine)platinum(II), PtCl2(C3H5NH2)2, are monoclinic, a = 12.770(5), b = 5.838(2), c = 15.113(6) Å, β = 104.46(3)°, Z = 4, space group P21/c. The structure was solved by Patterson and Fourier syntheses and was refined by full-matrix least-squares to R = 0.057, Rw = 0.055 for 1577 reflections with I > 3σ(I). Bond lengths and angles are normal. A vibrational analysis of the compound and its d2-deuterated analogue was performed.


2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Dongmei Chen ◽  
Huafeng Shao ◽  
Wei Yao ◽  
Baochen Huang

Some polyisoprene samples of different microstructure contents were studied by Fourier transform infrared (FTIR) and1H Nuclear magnetic resonance (1H NMR). On the basis of detailed analysis of FTIR spectra of polyisoprene, the shift of absorption peaks caused by microstructure content’s variation was discussed. The contents of the polyisoprene samples’ microstructure which was determined by the1H NMR was used as the standard. Through the choice, calculation, and comparison with the corresponding absorption peaks of FTIR, a method based on the results of the analysis has been developed for the determination of the microstructure contents of polyisoprene by FTIR.


2020 ◽  
Vol 739 ◽  
pp. 136943 ◽  
Author(s):  
S. Sharmila Tagore ◽  
J. Swaminathan ◽  
D. Manikandan ◽  
S. Gomathi ◽  
S. Nirmal Ram ◽  
...  

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