Yoshika Imai

Vibrational spectra of (CD3)3MX and normal coordinate calculations for (CH3)3MX and (CD3)3MX (M = Ge, Sn; X = Cl, Br)

Abstract IR (4000-30 cm−1) and Raman (4000-0 cm−1) spectra of (CH3)3MX (M = Ge, Sn; X = Cl, Br) have been recorded, together with those of (CD3)3MX. By assuming the C3v, molecular symmetry, all the active fundamentals except an internal torsion have been assigned and normal coordinate calculations have been carried out to confirm the proposed assignments by a symmetry force field for (CH3)3MX and (CD3)3MX.

Far-i.r. spectra of charge-transfer complexes between IX (X = Cl, Br) and some pyridine and quinoline bases

Abstract Far-i.r. spectra of charge-transfer (CT) complexes of IX (X = Cl, Br) with pyridine, quinoline and their derivatives have been measured in solids. Assignments for the intermolecular NI stretching and the modified IX stretching vibrations are proposed. The force constants for these vibrations have been calculated assuming a linear triatomic model, putting a donor molecule as a point mass. The relationship between the relative decrease in the IX stretching force constants and the p K a values of donor molecules is discussed.

Vibrational spectra and normal coordinate calculations for trimethylselenonium-d0 and -d9 ions and dimethyl selenide-d0, -d6

Abstract The i.r. (4000-30 cm −1 ) and Raman (4000-0 cm −1 ) spectra of trimethylselenonium iodide and dimethyl selenide have been obtained, together with those of their deuterated analogues. All the active fundamentals of the trimethylselenonium ion have been assigned, assuming C 3ν molecular symmetry. Normal coordinate calculations have been carried out for the trimethyl-selenonium ion and dimethyl selenide and the SeC force constants of both the compounds are compared, including those of other corresponding chalcogenides.

Vibrational spectra and normal coordinate calculations for methylethynylmercury(II)-d0, -d1, -d3, and -d4,

Abstract Infrared spectra (4000-80 cm −1 ) and Raman spectra (4000-O cm −1 ) of methylethynylmercury(II) d 0 , - d 1 , - d 3 , and - d 4 , have been recorded. Assignments for all the fundamentals have been made assuming C 3υ molecular symmetry. Normal coordinate calculations have been carried out.

Vibrational spectra and normal coordinate calculations for dimethyltelluride-d0, -d6 and dimethyltellurium difluoride-d0, -d6

Abstract The i.r. (4000-30 cm −1 ) and Raman (4000-O cm −1 ) spectra of dimethyltelluride, dimethyltellurium difluoride and their deuterated analogs have been obtained. All the active fundamentals of these compounds except methyl torsions were assigned, assuming a C 2υ molecular symmetry for both the tellurides. Normal coordinate calculations have been made in order to confirm the proposed assignments. The skeletal bond strength of the tellurides together with that of TeF 4 are discussed, using the valence stretching force constants.

Vibrational spectrum of [(CD3)3S]I and normal coordinate calculations for [(CH3)3S]+ and [(CD3)3S]+ cations

Abstract IR (4000-30 cm −1 ) and Raman (4000-0 cm − ) spectra of [(CD 3 ) 3 S]I have been observed, together with those of [(CH 3 ) 3 S]I. By assuming a C 3 v molecular symmetry for the cations [(CH 3 ) 3 S] + and [(CD 3 ) 3 S] + , all the active fundamentals of [(CD 3 ) 3 s] + have been assigned and normal coordinate calculations have been carried out by a symmetry force field for [(CH 3 ) 3 S] + and [(CD 3 ) 3 S] + . The strength of the SC and CH bonds in the compound has been compared with that in dimethyl sulfide by using their valence stretching force constants.

Vibrational spectra and the structures of (CH2X)2Hg (X = Cl, Br, I)

Abstract Infrared spectra from 4000 to 80 cm −1 and Raman spectra have been obtained on the solid state, as well as on the melt, for bis -(chloromethyl)-, bis -(bromomethyl)- and bis -(iodomethyl)-mercury. It is concluded from their spectra that the structures of these molecules are nearly trans in the solid, but the melt consists of gauche and trans forms. It is also suggested that the bis -(halogenomethyl) -mercurials have a charge-transfer interaction with benzene.

Vibrational spectra and normal coordinate calculations for CH3HgCCX and CD3HgCCX(XCl, Br)

Abstract IR spectra (4000-80 cm−1) and Raman spectra (4000-0 cm−1) of CH3HgCC and Cd3HgCCX (XCl, Br) have been recorded. Assignments for all fundamentals except for CHgC deformation have been made assuming C3ν molecular symmetry. Normal coordinate calculations have been carried out.