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- W2959094957 abstract "Two Co II -based coordination polymers, namely poly[(μ 4 -biphenyl-2,2′,5,5′-tetracarboxylato){μ 2 -1,3-bis[(1 H -imidazol-1-yl)methyl]benzene}dicobalt(II)], [Co 2 (C 16 H 6 O 8 )(C 14 H 14 N 4 ) 2 ] n or [Co 2 ( o , m -bpta)(1,3-bimb) 2 ] n ( I ), and poly[[aqua(μ 4 -biphenyl-2,2′,5,5′-tetracarboxylato){1,4-bis[(1 H -imidazol-1-yl)methyl]benzene}dicobalt(II)] dihydrate], {[Co 2 (C 16 H 6 O 8 )(C 14 H 14 N 4 ) 2 (H 2 O) 2 ]·4H 2 O} n or {[Co 2 ( o , m -bpta)(1,4-bimb) 2 (H 2 O) 2 ]·4H 2 O} n ( II ), were synthesized from a mixture of biphenyl-2,2′,5,5′-tetracarboxylic acid, i.e. [H 4 ( o , m -bpta)], CoCl 2 ·6H 2 O and N-donor ligands under solvothermal conditions. The complexes were characterized by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction analysis. The bridging ( o , m -bpta) 4− ligands combine with Co II ions in different μ 4 -coordination modes, leading to the formation of one-dimensional chains. The central Co II atoms display tetrahedral [CoN 2 O 2 ] and octahedral [CoN 2 O 4 ] geometries in I and II , respectively. The bis[(1 H -imidazol-1-yl)methyl]benzene (bimb) ligands adopt trans or cis conformations to connect Co II ions, thus forming two three-dimensional (3D) networks. Complex I shows a (2,4)-connected 3D network with left- and right-handed helical chains constructed by ( o , m -bpta) 4− ligands. Complex II is a (4,4)-connected 3D novel network with ribbon-like chains formed by ( o , m -bpta) 4− linkers. Magnetic studies indicate an orbital contribution to the magnetic moment of I and II due to the longer Co...Co distances. An attempt has been made to fit the χ M T results to the magnetic formulae for mononuclear Co II complexes, the fitting indicating the presence of weak antiferromagnetic interactions between the Co II ions." @default.
- W2959094957 created "2019-07-23" @default.
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- W2959094957 date "2019-07-09" @default.
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- W2959094957 title "Two CoII coordination polymers of biphenyl-2,2′,5,5′-tetracarboxylic acid with flexible N-donor ligands: syntheses, structures and magnetic properties" @default.
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- W2959094957 doi "https://doi.org/10.1107/s2053229619009136" @default.
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