Raman depolarization ratios and the symmetry of Si(NCO) 4  and Ge(NCO) 4 | Zendy

Miller Foil A. | Zendy; Snider A. Monroe | Zendy

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Raman depolarization ratios and the symmetry of Si(NCO) 4 and Ge(NCO) 4

Author(s) -

Miller Foil A.,

Snider A. Monroe

Publication year - 1974

Publication title -

journal of raman spectroscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.748

H-Index - 110

eISSN - 1097-4555

pISSN - 0377-0486

DOI - 10.1002/jrs.1250020408

Subject(s) - raman spectroscopy , tetrahedron , depolarization , symmetry (geometry) , molecule , chemistry , tetrahedral molecular geometry , depolarization ratio , homogeneous space , tetrahedral symmetry , excitation , crystallography , molecular vibration , molecular physics , physics , geometry , rotational symmetry , mathematics , optics , quantum mechanics , medicine , endocrinology , organic chemistry

Depolarization ratios, ϱ, have been measured to determine whether or not these molecules are tetrahedral. Totally‐symmetric vibrations of T b molecules have ϱ0, whereas for all lower symmetries ϱ may be anywhere between 0 and 0.75. For Si(NCO) 4 there are two bands with ϱ0.65 and 0.64, showing clearly that it is not tetrahedral. For Ge(NCO) 4 the results are ambiguous, for the highest value observed for a polarized line is 0.086. However there is other evidence against T d symmetry for this molecule, especially selection rule behaviour. It is concluded that neither molecule is tetrahedral. The true symmetry is not known. The complete Raman spectrum has been re‐measured, and the results are given.

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