Dipole moments of some metal complexes of five new monothio-β-diketones

Abstract

Dipole moments have been determined for Co(III), Ni(II), Pd(II), Pt(II), Cu(II) and Zn(II) complexes of the fluorinated monothio-β-diketones RC(SH)CHCOCF 3 [R  5′-methyl-2′-thienyl, 5′-chloro-2′-thienyl, 4′-isopropylphenyl, 4′- tert-butylphenyl and 3′-fluoro-4′-methoxyphenyl] from static-polarization measurements. The moments clearly indicate cis-square-planar configurations for the nickel, palladium and platinum complexes. The zinc complexes have tetrahedral structure and copper complexes have distorted cis-square-planar structure. The cobalt complexes perhaps have facial-octahedral structure. The values of dipole moment for the complexes varies with R: 5′-methyl-2′-thienyl > 3′-fluoro-4′-methoxyphenyl > 4′-isopropylphenyl ≈ 4′- tert-butylphenyl > 5′-chloro-2′-thienyl.