Oxides Of Nitrogen And Thiocyanate Ligand Complexes Containing Pyridine Pyrazine Synthesis, Characterization And Nature Of The Study

In this dissertation five new complexes have been designed andsynthesized, which include the binuclear Mn(â…¡) complex[Mn₂(μ-dmpo)₂(dmpo)₂(SCN)₄(H₂O)₂](1) with 3,5-dimethylpyridine N-oxide asbridging ligand, binuclear Mn(â…¡) complex [Mn₂(μ-po)₂(H₂O)₆I₂]I₂ (2) withpyridine N-oxide as bridging ligand, binuclear Cu(â…¡) complex [Cu₂(μ-mpo)₂Br₄] (3) with 4-methoxypyridine N-oxide as bridging ligand, and twotwo-dimensional coordination polymers [Co(μ_1,3-SCN^-)₂(μ_1,6-dmp)]_n (4) and[Cd(μ_1,3-SCN^-)₂(μ_1,6-dmp)]_n (5) with 2,3-dimethylpyrazine-1,4-dioxide andthiocyanate as mixed-bridged ligands. The five complexes were characterizedwith infrared spectra, elemental analysis and X-ray crystallographic analysis.The variable temperature magnetic susceptibilities (4-300 K) were measuredfor the binuclear Mn(â…¡) complex [Mn₂(μ-dmpo)₂(dmpo)₂(SCN)₄(H₂O)₂](1)with 3,5-dimethylpyridine N-oxide as bridge ligand and a binuclear fittingformula was used and the magnetic coupling constant 2J=-2.17cm^-1 wasobtained through the fitting, and it implies that there is a very weakanti-ferromagnetic interaction between the bridged Mn(â…¡) ions.The results of this dissertation will benefit the synthesis of novelmulti-nuclear complexes and it will also benefit the study of magnetic couplingdominating factors for the complexes with pyridine N-oxide and its derivativesas bridge ligands.