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The visible and near ultraviolet absorption spectra of a range of heteroannularly bridged ferrocene derivatives have been recorded and compared with those of analogous non-bridged compounds\_ The results have shown that the absorption bands appearing in this region are sensitive to the piesence of ring substituents, particularly those capable ofconjugative interaction with the cyclopentadienyl system. The band appearing at 440 nm in the ferrocene spectrum also responds to ring-tilt deformation of the ferrocene nucleus\_ The findings are discussed in relation to current theories of the electronic structure of ferrocene. \* For Part I, see ref. la; Part Ii, see ref. lb. \*rt A different view has been taken by Lundquist and Cais who have assigned these bands to electronic transitions in the ring-metal bonds'. J. Organomerul. Chem., 15 (1968) 177-185 \* From semi-empirical MO calculations, a red shift h= been predicted for the ferrocene low enera bands when electron-donor groups are substituted in the rings". J. Organometal. Chem.. (1968) 177-185 \* Comparison of the spectra of related derivatives in the [4]-and [5] -series (cf-I, VIII, IX, and X) has shown that the Band II maximum for

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Author

T.H. Barr; W.E. Watts

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-328X)

Published

1968

Language

EN

Field

Chemistry (Physical Sciences)