Studies in selenium-77 and tellurium-125 nuclear magnetic resonance. Substituent effects and polarizability
作者:Narender P. Luthra、Anthony M. Boccanfuso、R.Bruce Dunlap、Jerome D. Odom
DOI:10.1016/0022-328x(88)80638-7
日期:1988.10
well-known “γ effect” offer a clear understanding of a large number of 77Se chemicalshifts. The same intramolecular polarizability concept can be used when examining the chemicalshifts of tellurides and ditellurides. Here, even larger substituent caused chemicalshifts are observed. Solvent effects on 125Te chemicalshifts of dimethyl telluride were also examined in solvents of varying polarizability. As
Voronkov, M. G.; Sorokin, M. S., Journal of general chemistry of the USSR, 1986, vol. 56, # 8, p. 1608 - 1616
作者:Voronkov, M. G.、Sorokin, M. S.
DOI:——
日期:——
Cherkasov, L. N.; Radchenko, S. I., Russian Journal of Organic Chemistry, 1994, vol. 30, # 3.2, p. 490 - 491
作者:Cherkasov, L. N.、Radchenko, S. I.
DOI:——
日期:——
Tschugajew, Chemische Berichte, 1909, vol. 42, p. 52
作者:Tschugajew
DOI:——
日期:——
Infrared and Raman spectra, conformational stability, barriers to internal rotation, ab initio calculations and vibrational assignment of ethyl methyl selenide
The Raman spectra (3200-10 cm-1) of ethyl methyl selenide in the gas, liquid and solid phases and the infrared spectra (3200-30 cm-1) of the gas and solid have been recorded. Qualitative depolarization ratios have been obtained for the lines in the Raman spectrum of the liquid. By a variable temperature Raman study of the liquid, it has been determined that the gauche conformer is more stable than the trans rotamer by 158 +/- 16 cm-1 (452 +/- 46 cal mol-1), and the gauche conformer is the rotamer present in the solid. A complete vibrational assignment for the gauche conformer is presented. All of these data are compared to the corresponding quantities obtained from ab initio Hartree-Fock gradient calculations employing the STO-3G* and 4-31G*/MIDI-4* basis sets. Complete equilibrium geometries have been calculated for both rotamers and the results are discussed and compared with the corresponding quantities for some similar molecules.