Vibrational spectroscopy of platinum(0) complexes—III. An improved normal coordinate analysis for Pt(O)(C2H4) and other M(C2H4) systems
✍ Scribed by Joseph A. Crayston; George Davidson
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 327 KB
- Volume
- 43
- Category
- Article
- ISSN
- 1386-1425
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✦ Synopsis
The availability of new infrared and Raman data for metal-ethene complexes, has prompted a new normal coordinate analysis of the M(C2H4) fragment, using a larger data set than in previous studies. Assuming local C2~, symmetry, M(C2H4) is treated in identical fashion to ethene oxide, C2H40. Thus, a set of generalised valence force field (GVFF) force constants is obtained by fitting all of the al and bl wavenumbers of C2H40, C2D,,O , CzH4Pt 1I, C2D4Pt H, C2H4Fe t°~, C2D4Fe ~°~ and C2H4Ptt°k The trends in CC and MC stretching force constants indicate an increasing tendency towards a metallocyclopropane form, in the order: C2H,,Pt II < C2H,,Fe t°~ ~< C2H,~Pt ~°~ < C2H40. These, and other force constants, suggest that Zeise's salt is exceptional in not adopting a metallocyclopropane structure.