Synthesis, reactions and physico-chemical characterisation of iron(III) complexes containing substituted benzoxazole and various Schiff base moieties

Abstract

Some new complexes of iron (III) of the type [ (μ-Cl)₂ Fe₂ {η²-

(pbox)}₄] (<b>1</b>) and [(Cl)₂ Fe₂ {η²-(pbox)}] (<b>2</b>) [where <b><i>H</i></b>opbox={2-

(o-hydroxyphenyl )} –benzoxazole], have been synthesized by the

interactions of iron(III) chloride with the corresponding ligand (<b><i>H</i></b>opbox) in 1:2 and 1:1 molar ratio(s) is hot ethanol as reaction medium. The complex <b style="mso-bidi-font-weight:normal">1</b> has been further treated with various sodium salts of Schiff bases (sh) [Na(o-smab), Na(p-smab) and Na(sap)], alkoxo-Na(OPr'). arylo xo-Na(OAr) and tell'aisopropoxyaluminate [Na{ AI (OPr¹)}₄] in 1: 1 molar ratio (in THF- benzene medium) to produce derivatives of the type: { (sb)Fe{N²- pbox)}₂] (<b>3</b>), (<b>4</b>) and (<b>5</b>),[(μ-OPr¹)₂ Fe₂ {η²-(pbox)₄}] (<b>6</b>) [(μ-OAr)₂ Fe₂{η²-(pbox)₄}] (7) and [(μ-OAr)₂ Fe{η²-( pbox)₂}] (<b>8</b>). All these derivatives have been characterised by elemental analysis, spectral (IR, UV-vis and FAB-mass) and magnetic susceptibility measurements. On the basis of these studies, most plausible structures for the iron(III) complexes have been suggested.