Anisotropic optical polarisabilities of the complexes LCr(CO)5 (L = PMe3, NMe3 or NH3): A study of π-back-bonding
1986; Elsevier BV; Volume: 309; Issue: 3 Linguagem: Inglês
10.1016/s0022-328x(00)99629-3
ISSN1872-8561
AutoresM. J. Aroney, M. K. COOPER, R. K. PIERENS, S.J. Pratten,
Tópico(s)Fluorine in Organic Chemistry
ResumoDipole moments and electric birefringences are reported for the complexes LCr(CO)5 where L is PMe3, NMe3 or NH3. Comparison of the molecular optical polarisability anisotropies of PMe3Cr(CO)5 and NMe3Cr(CO)5 shows a large enhancement of polarisability specifically in the L-Cr-(trans)CO direction for the phosphorus compound; the polarisabilities perpendicular to the symmetry axis are closely similar for the two complexes. The results are interpreted as direct evidence for a highly deformable π-component in PCr bonding. This work presents a new experimental approach to the study of π-back-bonding.
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