Synthesis, structure, and spectroscopic properties of copper(II) and nickel(II) complexes containing the 1,4,7-triisopropyl-1,4,7-triazacyclononane ligand

摘要

Three new complexes [CuL(N-3)(2)] (1), [CuL(SCN)(2)] (2), and [NiL(SCN)(2)] (3) (L = 1,4,7-triisopropyl-1,4,7-triazacyclononane, [-NR-C2H4-NR-C2H4-NR-C2H4-], R = i-Pr) have been synthesized and structurally characterized. The three complexes all crystallize in the monoclinic space group P2(1), with the unit cell parameters a = 9.100(5), b = 19.492(11), c = 11.646(6) Angstrom, beta = 94.526(9)degrees for 1, a = 10.148(3), b = 13.611(5), c = 15.777(6) Angstrom, beta = 95.412(6)degrees for 2 and a = 9.270(7), b = 16.629(14), c = 14.886(12) Angstrom, beta = 101.217(15)degrees for 3. The central copper(II) and nickel(II) ions are coordinated to five nitrogen atoms, three of which from the L and two from N-3(-) or SCN-, forming a slightly distorted square pyramidal geometry. Moreover, elemental analysis, IR, UV-vis and ESR spectra of complexes 1-3 were also determined.