Abstract
Dipole moments have been determined by static polarization measurements for the nickel(II), palladium(II), platinum(II), and cobalt(III) chelates of the fluorinated mercapto-β-diketones RC(SH):CHCOCF3(R =m-MeC6H4, m-ClC6H4, m-BrC6H4, p-FC6H4, pClC6H4, and m,p-Cl2C6H3). The moments indicate cis-square-planar configurations for the nickel, palladium, and platinum complexes and suggest a facial-octahedral configuration for the cobalt complexes. The variation of the dipole moments with R is considered to be dependent on: (a) the magnitude and vector directions of the Ph–X bond moments; (b) the inductive effect of the meta- and para-substituent on the phenyl ring; and (c) the mesomeric effect of the substituent X.
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