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

Abstract

Dipole moments have been determined by static polarization measurements for the nickel(II), copper(II), zinc(II), palladium(II), platinum(II) and cobalt(III) chelates of the fluorinated monothio-β-diketones RC(SH)CHCHOF 3 [R = 4′-C 2H 5C 6H 4, 4′-OC 2H 5C 6H 4, 3′,5′-(CH 3O) 2C 6H 3 and 3′, 4′, 5′-(CH 3O) 3C 6H 2]. The moments indicate cis-square-planar configurations for the nickel, palladium and platinum complexes. The zinc complexes have tetrahedral structures and the configuration of copper complexes lies between square-planar and tetrahedral structures. The cobalt complexes perhaps have facial-octahedral configurations. The presence of steric hindrance when R is 3′, 4′, 5′-(CH 3O) 3C 6H 2 lower the dipole moments. Such hindrance is absent with R as 3′,5′-(CH 3O) 2C 6H 3.