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A new three‐dimensional cobalt(II) coordination polymer based on V‐shaped 3,4′‐oxydibenzoate: synthesis, crystal structure and magnetic properties
Author(s) -
Lan Wenlong,
Zhou Zhen,
Jia Fu-Chao,
Hao Xiaoyun,
Dou Yong,
Yang Lu,
Liu Hui,
Liu Qingyun,
Zhang Daopeng
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619008337
Subject(s) - crystallography , denticity , octahedron , crystal structure , bridging ligand , cobalt , chemistry , ligand (biochemistry) , single crystal , coordination polymer , bipyridine , octahedral molecular geometry , inorganic chemistry , biochemistry , receptor
A new coordination polymer (CP), namely poly[(μ‐4,4′‐bipyridine)(μ 3 ‐3,4′‐oxydibenzoato)cobalt(II)], [Co(C 14 H 8 O 5 )(C 10 H 8 N 2 )] n or [Co(3,4′‐obb)(4,4′‐bipy)] n ( 1 ), was prepared by the self‐assembly of Co(NO 3 ) 2 ·6H 2 O with the rarely used 3,4′‐oxydibenzoic acid (3,4′‐obbH 2 ) ligand and 4,4′‐bipyridine (4,4′‐bipy) under solvothermal conditions, and has been structurally characterized by elemental analysis, IR spectroscopy, single‐crystal X‐ray crystallography and powder X‐ray diffraction (PXRD). Single‐crystal X‐ray diffraction reveals that each Co II ion is six‐coordinated by four O atoms from three 3,4′‐obb 2− ligands, of which two function as monodentate ligands and the other as a bidentate ligand, and by two N atoms from bridging 4,4′‐bipy ligands, thereby forming a distorted octahedral CoN 2 O 4 coordination geometry. Adjacent crystallographically equivalent Co II ions are bridged by the O atoms of 3,4′‐obb 2− ligands, affording an eight‐membered Co 2 O 4 C 2 ring which is further extended into a two‐dimensional [Co(3,4′‐obb)] n sheet along the ab plane via 3,4′‐obb 2− functioning as a bidentate bridging ligand. The planes are interlinked into a three‐dimensional [Co(3,4′‐obb)(4,4′‐bipy)] n network by 4,4′‐bipy ligands acting as pillars along the c axis. Magnetic investigations on CP 1 disclose an antiferromagnetic coupling within the dimeric Co 2 unit and a metamagnetic behaviour at low temperature resulting from intermolecular π–π interactions between the parallel 4,4′‐bipy ligands.