Abstract

Chromium (III) and iron (III) complexes of the general formula [M(Ln)X2]X {M = Cr (III) or Fe (III) ions ; L = macrocyclic ligand; n = 1 or 2, where L1 = (8,9; 17, 18 - di (4-nitrobenzene) - 2,6 ; 11, 15 – tetraoxo -1,7 ; 10, 16-tetraazacyclooctadecane) or L2 = (9,10 ; 19,20- di (4-nitrobenzene) -2 , 7; 12,17-tetraoxo-1,8;11,18-tetraazacyclo dodecane) ; X = Cl- or NO3- }, containing 18 or 20 membered rings, have been synthesized by the template condensation of the aliphatic dicarboxylic acids HOOC-(CH2)y-COOH (y = 3 or 4) with 4 - nitro , 1 , 2-phenylenediamine in the presence of chromium(III) or iron(III) salts. The prepared complexes were characterized by metal content analyses, IR, electronic spectroscopy, magnetic susceptibility and conductivity measurements. I.R spectra confirm coordination of amide nitrogens to the central metal ion. An octahedral geometry has been suggested for all the complexes. The molar conductance values of the complexes show that they are 1:1 electrolytes.

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The article was added to IASJ on 2012-05-30

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