Synthesis, structure and magnetic properties of mononuclear [Mn(2,2'-bipyrimidine)(2)(H2O)(2)][ClO4](2) and polynuclear [Mn(2,2'-bipyrimidine)(NO3)(2)] complexes

Two new complexes [Mn(bpym)(2)(H2O)(2)][CLO(4)](2) (1) and [Mn(bpym)(NO3)(2)] (2) (bpym = 2,2'-bipyrimidine) have been prepared and characterized by spectroscopic and X-ray diffraction methods. Compound 1 consists of a mononuclear [Mn(bpym)(2)(H2O)(2)](2+) unit in which the manganese atom shows a distorted elongated octahedral coordination with two bpym nitrogens and two H2O oxygens forming a cis configuration. The structure of compound 2 is made up of an infinite zigzag bpym-bridged polymeric chain with [Mn(bpym)(NO3)(2)] units, in which the manganese atom has seven coordination with four nitrogen atoms of two bpym ligands and three oxygen atoms of monodentate NO3- and bidentate NO3- anions. The intermetallic distance of Mn ... Mn is 6.234(2) Angstrom The temperature dependence of the magnetic susceptibility of 2 reveals the presence of a one-dimensional Heisenberg antiferromagnetic chain with J = -0.93 cm(-1).