Details of the synthesis and physical properties of octahedral transition metal complexes of the tridentate tris chelating ligand [Me2Ga(OCH2CH2NH2)(N2C3H3)]− are given. Crystals of sym-fac-bis[dimethyl(ethanolamino)(1-pyrazolyl)gallato(N(2),O,N]nickel(II) are monoclinic, a = 11.7908(6), b = 7.3158(6), c = 12.5797(8), β = 97.035(7)°, Z = 2, space group P21/n and crystals of the mer isomer are monoclinic, a = 18.6617(7), b = 8.7941(4), c = 13.5670(8), β = 91,766(4)°, Z = 4, space group P21/c. The structures were solved by Patterson and Fourier syntheses and were refined by full-matrix least-squares procedures to final R values of 0.048 and 0.052 for 1881 and 2573 reflections with I ≥ 3σ(I) for the fac and mer isomers respectively. The nickel atoms in both structures were found to have distorted octahedral coordination geometry. Bond lengths (corrected for libration) are: Ni—O, 2.090(3); Ni—N, 2.085(3) and 2.112(3); Ga—O, 1.908(3); Ga—N, 2.010(3); and Ga—C, 1.979(5) and 1.981(6) Å for the fac isomer, and Ni—O, 2.045(4) and 2.049(4); Ni—N, 2.091 (4)-2.156(5); Ga—O, 1.898(4) and 1.899(4); Ga—N, two at 1.991 (5); and Ga—C, 1.948(8)-1.971 (7) Å for the mer isomer.
Transition Metal Complexes with Tridentate Ligand: Preparation, Spectroscopic Characterization, Thermal Analysis and Structural Studies