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Synthesis, Spectral and Thermal Analyses of Novel Bi‐ and Polyhomonuclear Complexes of Pyrimidine Bisazo‐dianil Derivatives
Author(s) -
ElWakiel Nadia,
Khedr Abdalla,
Mansour Ramadan
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090097
Subject(s) - chemistry , tetrahedral molecular geometry , thermal decomposition , octahedral molecular geometry , metal , crystallography , ligand (biochemistry) , octahedron , molecule , magnetic moment , transition metal , stereochemistry , crystal structure , catalysis , biochemistry , physics , receptor , organic chemistry , condensed matter physics
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 (H 8 L 1 , H 8 L 2 and H 6 L 3 ). 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 [L 1 Co 7 Cl 6 (H 2 O) 10 ]·22H 2 O ( 1 ), [H 2 L 2 Mn 6 Cl 6 (H 2 O) 8 ]·3H 2 O·2EtOH ( 3 ), [L 2 Co 8 Cl 8 (H 2 O) 12 ]·24H 2 O ( 4 ), [H 4 L 3 Co 2 Cl 2 (H 2 O) 2 ]·8H 2 O·2EtOH ( 6 ) with a tetrahedral geometry and [H 2 L 1 Ni 5 Cl 4 (H 2 O) 16 ]·19H 2 O·EtOH ( 2 ), [L 2 Ni 8 Cl 8 (H 2 O) 28 ]·8H 2 O·EtOH ( 5 ) with an octahedral geometry while [H 6 L 3 Cu 3 (H 2 O) 7 ]Cl 3 ·10H 2 O ( 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 *, Δ H *, Δ S *, and Δ G * were calculated.