Novel Malonate-Containing Coordination Compounds with Ligands Having N- and NO-Donors: Synthesis, Structures, and Magnetic Properties

Abstract

In our efforts to tune the structures of mixed-ligands malonate-containing coordination compounds, four copper(II) and two high-spin cobalt(II) complexes of formulas [Cu(mal)(H2O)(dpo)]n(1), [Cu2(mal)2(H2O)2(dpp)]n·7nH2O (2), [Cu2(mal)2(H2O)2(bpe)]n·2nH2O (3), {[Cu(mal)2(H2O)2][Cu(dien)]}n·4nH2O (4) [Co2(mal)2(H2O)6(dpo)]·2H2O (5) and [Co(mal)(H2O)(phen)]n·2nH2O (6) [H2mal = malonic acid, dpo =4,4′-bipyridine-N,N′-dioxide, dpp = 2,3-bis(pyridyl)pyrazine, bpe =1,2-bis(4-pyridyl)ethylene, dien = diethylenetriamine and phen = 1,10-phenanthroline] have been synthesized and structurally characterized by X-ray diffraction on single crystals. Complexes 1, 2, 4, and 6 are chain compounds, 5 is a dinuclear species, and 3 has a sheet-like structure. The malonate ligand in this family acts as either a blocking (1 and 5) or bridging ligand (2–6). The rod-like molecules dpo (1 and 5) and bpe (3) exhibit the bis-monodentate (1 and 3) and monodentate (5) coordination modes, whereas dpp (2), dien (4), and phen (6) act as...