Iron (II) and Iron(III) complexes of organophosphonic acids

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Polynuclear Iron(II) and Iron(III) derivatives of 1-Aminoethylidenediphosphonic acid (AEDP, H4L1 ), Alpha-Amino benzylidene diphosphonic acid (ABDP, H4 L2 ), 1-Amino-2-carboxyethane-1,1- diphosphonic acid (ACEDP, H5 L3 ), 1,3 Diaminopropane-1,1,3,3-tetraphosphonic acid (DAPTP, H8L4 ), Diethylene triamine –N,N,N’,N’,N’’N”-penta ( methylene phosphonic ) acid (DETAPMPO, H10L5 ),and Diethylene triamine –N,N’’-bis (dimethyl methylene phosphonic )acid (DETBDMPO, H4 L6 ) have been prepared in aqueous medium. The general formula of Iron (II) derivatives from elemental analysis is Fe2 L.XH2 O (in case of AEDP, ABDP, DETBDMPO), Fe5 L2 .XH2 O (in case of ACEDP) Fe4 L.XH2 O, Fe2 H4 L .XH2 O (in case of DAPTP), Fe5 L.XH2 O (in case of DETAPMPO). The general formula of Iron(III) derivatives from elemental analysis is Fe2 (OH)2L.XH2O (in case of AEDP, ABDP, DETBDMPO ), Fe3 L(OH)(in case of DAPTP) Fe4 L(OH)2 .H2 O(in case of DETAPMPO).The electronic spectra of Iron(II) complexes have shown them to have octahedral geometry. Antiferromagnetism has been inferred from magnetic moment data. Infrared spectral studies were carried out to determine coordination sites.

Organophosphonic acids; Metal organophosphonates; Coordination sites; Octahedral geometry; Antiferromagnetism