Coordination complexes of the n-oxides of aromatic diimines and diazines

A series of heterobimetallic, cyano-bridged 3D inorganic−organic hybrid networks with MnII−L−MnII and MnII−NC−NbIV linkages are reported. Reaction of [Mn(H2O)6]2+ with [Nb(CN)8]4- in the presence of organic linker L (pyrazine (pyz), pyrazine-N,N‘-dioxide (pzdo), and 2,2‘-bipyrimidine (bpym)) in H2O affords {MnII2(pz)2(H2O)4[NbIV(CN)8]}·pz·3H2O (1), {MnII2(pzdo)(H2O)4[NbIV(CN)8]}·5H2O (2), and {MnII2(bpym)(H2O)2[NbIV(CN)8]} (3), respectively. 1−3 were examined by X-ray crystallography and vibrational and magnetochemical studies. 1 is characterized by the coexistence of 3D inorganic cyano-bridged and 1D organic [Mn−(μ-pyz)]n2n+ sublattices along with the presence of monocoordinated and crystallization molecules of pyrazine. Assemblies 2 and 3 exhibit dimeric {MnII2−(μ-L)}4+ coordination motifs. The magnetic behavior of heterobimetallic 1−3 complexes is dominated by antiferromagnetic coupling between MnII and NbIV centers mediated by cyano bridges, resulting in long-range ferrimagnetic ordering with a high T...

High Tc Ferrimagnetic Organic−Inorganic Hybrid Materials with MnII−L−MnII and MnII−NC−NbIV Linkages (L = Pyrazine, Pyrazine-N,N‘-dioxide, Bipyrimidine)

Characterization studies of adenine complexes with 3d metal perchlorates

Infrared and far infrared studies of monomeric and polymeric base adducts of phthalocyaninato transition metal(II) complexes

Purine complexes with divalent 3d metal chlorides

The complexes of the Mn (II), Fe (II), Co(II), Ni(II), and Cu(II) halides with pyrazine (1,4-diazine), pyrimidine (1,3-diazine), and pyridazine (1,2-diazine) were prepared and studied by various physical methods. Reflectance spectra, infrared spectra from 4000-80 cm−1, and magnetic moments were determined. The data are suggestive of an octahedral environment involving halide and azine bridging in the 1: 1 complexes, and an octahedral environment involving halide bridging and terminal azines in the 1: 2 complexes.

W. Wozniak

Papers

Transition Metal(II) Complexes of the Azines