Quality Control of 2-(Pyridin-4-yl)-1H-benzo[d]imidazole. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, is researched, Molecular C12H9N3, CAS is 2208-59-5, about Syntheses, structures and magnetic properties of Co(II) complexes based on H4BTEC and 2-(n-pyridyl)benzimidazole (n = 2, 3, and 4). Author is Xia, Chang-Kun; Lu, Can-Zhong; Yuan, Da-Qiang; Zhang, Quan-Zheng; Wu, Xiao-Yuan; Zhang, Jian-Jun; Wu, Ding-Ming.
The hydrothermal reactions of Co(II) salts with 1,2,4,5-benzenetetracarboxylic acid (H4BTEC) and 2-(n-pyridyl)benzimidazole (n = 2, 3, 4) gave three new coordination complexes, namely, [Co(BTEC)0.5(2-PyBIm)·H2O]·H2O (1), [Co(BTEC)0.5(3-PyBIm)·H2O] (2), [Co(H2BTEC)(4-PyBIm)2]·H2O (3) were studied. The H4BTEC ligands adopt different coordination modes according to the orientation of the pyridyl-substituted benzimidazole. In complex 1, the BTEC4- acts as four-dentate bridging ligand with all carboxylate groups adopt unidentate coordination fashion, leading a two-dimensional coordination network. While in 2, two of the four carboxylate groups adopt chelating bi-dentate coordination mode, and the others demonstrate monodentate coordination fashion; leading a 1-dimensional chain with the nearest Co···Co separation being 5.057 Å. In 3, the adjacent carboxylate groups chelate the Co(II) atom in the monodentate coordination fashion, leading a 1-dimensional undulating chain. Finally, all the complexes are extended into three-dimensional framework via H-bonding as well as π-π interactions. The thermal stabilities and temperature-dependent magnetic susceptibilities for the three complexes were also studied.
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