Metal Chelates with Some Cellulose Derivatives: V. Synthesis and Characterization of Some Iron(III) Complexes with Cellulose Ethers

Abstract

Two types of monoligand complexes of FeCl 3 , Fe(NO 3 ) 3 and Fe 2 (SO 4 ) 3 with hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC) were prepared and characterized. Elemental analysis, UV and IR spectroscopies, conductance and magnetic measurements were used to assign the mode of coordination in the isolated species. The investigation revealed that Fe(III) exhibits tetrahedral coordination with HEC and CMC. These ligands act as a bidentate chelating agent via the two oxygen atoms of the vicinal hydroxyl and ether groups (ethoxyl or carboxymethyl groups). The prepared complexes have the formula [(HEC) FeCl]Cl, [(HEC) FeNO 3 ]NO 3 , [(HEC)FeSO 4 .H 2 O]H 2 O, [(CMC)FeCl . H 2 O]Cl . 2H 2 O, [(CMC)Fe 2NO 3 ]3H 2 O and [(CMC)-FeSO 4 .H 2 O]H 2 O. The results also showed that the type of cellulose ether (functional group) and the anion of the metal salts used have an effect on the conductivity, structure and absorptivity of Fe(III) complexes.