In:
Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr), Vol. 75, No. 8 ( 2019-08-01), p. 1073-1083
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.
Type of Medium:
Online Resource
ISSN:
2053-2296
DOI:
10.1107/S2053229619009136
DOI:
10.1107/S2053229619009136/yf3180sup1.cif
DOI:
10.1107/S2053229619009136/yf3180sf180123-7sup2.hkl
DOI:
10.1107/S2053229619009136/yf3180sf180611a_sqsup3.hkl
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2019
detail.hit.zdb_id:
2025703-X
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