Über substituierte Pentaphenyl-cyclopentadienyl-Verbindungen und Tetracyclone, IX.

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Abstract
A linear relationship has been found by correlating simple HMO- and McLachlan- HMO-spin densities with g-values of substituted tetraphenylcyclopentadienone (tetracyclone) metal ketyls, measured by EPR techniques. Assuming an out-of-plane angle — referred to the plane of the cyclopentadienone — of 60° for the α- and 30° for the β-phenyls the EPR data can be explained satisfactorily. This model serves as well to characterize, by means of HMO calculation, the two vis. bands of tetracyclone compounds (which are dependent on the nature of substituent) to be intramolecular charge transfer bands.

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