Synthesis, Spectral and Thermal Analyses of Novel Bi‐ and Polyhomonuclear Complexes of Pyrimidine Bisazo‐dianil Derivatives

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Seven new bi‐ and polyhomonuclear transition metal complexes with three polyhydroxlated bisazodianil ligands were synthesized and characterized. The ligands were derived from condensation of 6‐(5‐formyl‐2‐hydroxyphenylazo)‐2,4‐dihydroxypyrimidine with aliphatic diamines (H8L1, H8L2 and H6L3). The data of elemental and thermal analyses, molar conductance measurement, IR, electronic and ESR spectra as well as magnetic moment measurements support the formation of [L1Co7Cl6(H2O)10]·22H2O (1), [H2L2Mn6Cl6(H2O)8]·3H2O·2EtOH (3), [L2Co8Cl8(H2O)12]·24H2O (4), [H4L3Co2Cl2(H2O)2]·8H2O·2EtOH (6) with a tetrahedral geometry and [H2L1Ni5Cl4(H2O)16]·19H2O·EtOH (2), [L2Ni8Cl8(H2O)28]·8H2O·EtOH (5) with an octahedral geometry while [H6L3Cu3(H2O)7]Cl3·10H2O (7) has a distorted tetrahedral arrangement. The mode of bonding between the metal ions and the ligand molecules is determined and the metal‐metal interaction was studied. The activation thermo‐kinetic parameters for the thermal decomposition steps of the complexes E*, ΔH*, ΔS*, and ΔG* were calculated.