TY - JOUR
T1 - Static electronic and vibrational polarizabilities of poly(dimethylsilane) chains
AU - Champagne, Benoît
AU - Perpète, Éric A.
AU - André, Jean-Marie
PY - 1997/2/28
Y1 - 1997/2/28
N2 - The static electronic and vibrational contributions to the polarizability of poly(dimethylsilane) chains have been computed ab initio within the coupled Hartree-Fock and double harmonic schemes, respectively. Both vibrational and electronic components present a supralinear increase with chain length that can be attributed to σ-conjugation. With respect to the polysilane chains which adopt, in their equilibrium structure, an all-trans backbone conformation, the poly(dimethylsilane) chains present a helical conformation characterized by a 165° torsion angle. On one hand, the electronic component is larger than in polysilane chains due to the intrinsic contribution of the methyl groups and their inductive effects which decrease the band gap, while, on the other hand, its vibrational counterpart, which is mainly due to wagging motions, remains nearly unchanged by the methyl substitution.
AB - The static electronic and vibrational contributions to the polarizability of poly(dimethylsilane) chains have been computed ab initio within the coupled Hartree-Fock and double harmonic schemes, respectively. Both vibrational and electronic components present a supralinear increase with chain length that can be attributed to σ-conjugation. With respect to the polysilane chains which adopt, in their equilibrium structure, an all-trans backbone conformation, the poly(dimethylsilane) chains present a helical conformation characterized by a 165° torsion angle. On one hand, the electronic component is larger than in polysilane chains due to the intrinsic contribution of the methyl groups and their inductive effects which decrease the band gap, while, on the other hand, its vibrational counterpart, which is mainly due to wagging motions, remains nearly unchanged by the methyl substitution.
KW - Ab initio
KW - Coupled Hartree-Fock technique
KW - Polysilane chain
KW - Vibrational and electronic polarizability
UR - http://www.scopus.com/inward/record.url?scp=0008124664&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0008124664
SN - 0166-1280
VL - 391
SP - 67
EP - 73
JO - Journal of Molecular Structure: THEOCHEM
JF - Journal of Molecular Structure: THEOCHEM
IS - 1-2
ER -