Matrix-Isolation Studies and Ring Conformation of 1,3-Dithietane

1979 ◽  
Vol 33 (4) ◽  
pp. 361-364 ◽  
Author(s):  
V. F. Kalasinsky ◽  
E. Block ◽  
D. E. Powers ◽  
W. C. Harris

The infrared and Raman spectra of 1,3-dithietane have been recorded with the sample in the solid state and trapped in an argon matrix at 18K. The number of coincidences between the infrared and Raman spectra of the matrix-isolated sample is consistent with C2v molecular symmetry in which the ring has a puckered conformation. In the solid state a number of bands disappear upon annealing, and the observed mutual exclusion for the annealed solid can be interpreted in terms of D2h, symmetry. Whereas the matrix probably represents the “free” molecule, the planarity of the ring in the annealed solid can be attributed to crystal packing.

1981 ◽  
Vol 46 (11) ◽  
pp. 2613-2619 ◽  
Author(s):  
Jiří Toužín

Available data on infrared and Raman spectra of S4N4 in solid state and solutions have been verified and completed. On the basis of normal coordinate analysis an attempt has been made to define with more precision the interpretation of vibration spectra of this compound given in earlier reports.


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.


1973 ◽  
Vol 51 (16) ◽  
pp. 2697-2709 ◽  
Author(s):  
D. K. Frieson ◽  
G. A. Ozin

The 1:1 adducts MX4•PMe3 (M = Ge or Sn; X = Cl or Br) are prepared by recrystallization of the respective 1:2 complexes from excess MX4 acceptor. Solid state infrared and Raman Spectra and X-ray powder photographs suggest that these adducts are all trigonal bipyramidal with the ligand in an axial position. Normal coordinate calculations in C3v symmetry (axial ligand) and Cs symmetry (equatorial ligand) support this assignment. The rather high ν(MP) frequencies indicate unusually strong metal–phosphorus donor bonds in these compounds.


1989 ◽  
Vol 54 (8) ◽  
pp. 2045-2053 ◽  
Author(s):  
Jesús Perez-Peña ◽  
Melchor Gonzalez-Davila ◽  
Miguel Suarez-Tangil ◽  
Joaquin Hernandez-Brito

Infrared and Raman spectra of 2-mercaptoimidazole and 2-mercaptothiazole in solid state as well as i.r. spectra of 2-mercaptothiazole in HCCl3 and CS2 0.05M solutions have been investigated. A general assignment of all the observed bands is proposed for both fundamental vibrations and for overtone and combination bands. For 2-mercaptothiazole, the thiocarbonyl-form, intermolecularly hydrogen-bonded dimers in solid state, and unassociated molecules in dilute solutions of inert solvents have been established. Finally, based on this data, thermodynamic functions have been computed.


1978 ◽  
Vol 32 (5) ◽  
pp. 457-462 ◽  
Author(s):  
J. R. Durig ◽  
B. J. Streusand

The infrared (20 to 3100 cm−1) and Raman (10 to 3100 cm−1) spectra of gaseous (CH3)3SiOCH3 and (CH3)3SiOCD3 have been recorded. The Raman spectra of both liquids and the infrared and Raman spectra of the “light” compound in the solid state have also been recorded. A vibrational assignment based upon depolarization ratios, frequency shifts with isotopic substitution, and group frequencies is proposed. The Si—O torsional mode was observed at 67 cm−1 which gives a barrier to internal rotation of 1.02 kcal/mol. Strong mixing of the Si—O—C bending mode with the C—Si—C bends is proposed. The CH3—O torsion was not observed.


2010 ◽  
Vol 132 (3) ◽  
pp. 034504 ◽  
Author(s):  
Petar D. Todorov ◽  
Leonardus W. Jenneskens ◽  
Joop H. van Lenthe

Author(s):  
Viktor Stefov ◽  
Violeta Koleva ◽  
Metodija Najdoski ◽  
Adnan Cahil ◽  
Zuldjevat Abdija

Fourier transform infrared (FT-IR) spectra recorded at room temperature (RT) and at the boiling temperature of liquid nitrogen (LNT), as well as Raman spectra recorded at room temperature for the cubic polymorph of magnesium cesium arsenate hexahydrate (MgCsAsO4·6H2O) and its partially deuterated analogues, were interpreted with respect to the normal modes of the water molecules and the arsenate ions and water librations. The spectral characteristics of MgCsAsO4·6H2O were compared to the cubic form of the phosphate analogue. A spectral similarity between the two isostructural salts was established, except for the obvious differences due to the nature of the anions (AsO43– vs PO43–). The spectroscopic data for the uncoupled OD stretching mode of the matrix-isolated HDO molecules revealed that the hydrogen bonds formed in the arsenate salt were stronger than those in the phosphate. In the Raman spectrum of the protiated compound, only one very intensive band at 811 cm–1 was observed in the region of the stretching vibrations of the AsO43– ion, which was insensitive to deuteration. In accordance with the expectation, one band appeared in the same spectral range in the infrared spectra of the protiated and highly deuterated sample at 792 cm–1 and 810 cm–1, respectively, which can be attributed with certainty to the asymmetric stretching ν3(AsO4) modes.


1971 ◽  
Vol 25 (2) ◽  
pp. 182-186 ◽  
Author(s):  
J. R. Durig ◽  
S. J. Meischen ◽  
S. E. Hannum ◽  
R. R. Hitch ◽  
S. K. Gondal ◽  
...  

The ir spectra of (CH3)3SiCo(CO)4 in the gaseous (4000–250 cm−1) and solid (4000–33 cm−1) phases have been recorded. The Raman spectrum has also been recorded for the solid state. To aid in the assignment, the ir and Raman spectra were recorded of solid (CH3)3SiH. The vibrational assignment for most of the 60 normal modes has been given on the basis of the fundamental vibrations of the –Si(CH3)3 and –Co(CO)4 moities. The static field was sufficiently strong to split the degenerate modes but the correlation field was so weak that no definite splitting of the symmetric modes was detected.


1985 ◽  
Vol 63 (7) ◽  
pp. 1394-1398 ◽  
Author(s):  
Alain Lautié ◽  
Marie-France Lautié ◽  
Alexandre Novak

The infrared and Raman spectra of crystalline deltic acid and its deuterated derivative have been investigated in the 4000–20[Formula: see text]cm−1 range. An assignment of all the intramolecular fundamentals has been proposed assuming a C2v molecular symmetry. The crystal symmetry is likely to be described by the [Formula: see text] or P2/m space group with Z = 2. Deltic acid molecules probably form infinite chains linked with two very strong, asymmetric, and different OH … O hydrogen bonds, with O … O distances estimated at 2.49 and 2.56 Å.


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