Abstract

A dry benzene solution of the Schiff base, N‐(2‐hydroxyphenyl)‐3′‐carboxy‐2′‐hydroxybenzylideneimine upon reacting with mercaptoacetic acid undergoes cyclization and forms N‐(2‐hydroxyphenyl)‐C‐(3′‐carboxy‐2′‐hydroxyphenyl)thiazolidin‐4‐one, LH3 (I). A MeOH solution of I reacts with MnII, CuII , ZnII, FeIII and Mo ions and forms the monomeric coordination compounds, [Mn(LH)(MeOH)3] (II), [Cu(LH)(MeOH)] (III), [Zn(LH)(MeOH)] (IV), [FeCl(LH)(MeOH)2] (V), and [MoO2(LH)(MeOH)](VI). The coordination compounds have been characterized on the basis of elemental analyses, molar conductance, molecular weight, spectral (IR, reflectance, ESR) studies, and magnetic susceptibility measurements. I behaves as a dibasic tridentate OOS donor ligand in these compounds. The compounds are nonelectrolytes (ΛM = 6.2–13.8 mho cm2 mol−1) in DMF. A square‐planar structure for III; a tetrahedral structure for IV and an octahedral structure for II, V, and VI are suggested.

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