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Two‐dimensional Zn II and one‐dimensional Co II coordination polymers based on benzene‐1,4‐dicarboxylate and pyridine ligands
Author(s) -
Zhou Li-Juan,
Han Chang-Bao,
Wang Yu-Ling
Publication year - 2016
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/s2053229616000814
Subject(s) - carboxylate , pyridine , chemistry , crystallography , supramolecular chemistry , benzene , stacking , coordination polymer , cobalt , stereochemistry , crystal structure , inorganic chemistry , medicinal chemistry , organic chemistry
Coordination polymers constructed from metal ions and organic ligands have attracted considerable attention owing to their diverse structural topologies and potential applications. Ligands containing carboxylate groups are among the most extensively studied because of their versatile coordination modes. Reactions of benzene‐1,4‐dicarboxylic acid (H 2 BDC) and pyridine (py) with Zn II or Co II yielded two new coordination polymers, namely, poly[(μ 4 ‐benzene‐1,4‐dicarboxylato‐κ 4 O : O ′: O ′′: O ′′′)(pyridine‐κ N )zinc(II)], [Zn(C 8 H 4 O 2 )(C 5 H 5 N)] n , (I), and catena ‐poly[aqua(μ 3 ‐benzene‐1,4‐dicarboxylato‐κ 3 O : O ′: O ′′)bis(pyridine‐κ N )cobalt(II)], [Co(C 8 H 4 O 2 )(C 5 H 5 N) 2 (H 2 O)] n , (II). In compound (I), the Zn II cation is five‐coordinated by four carboxylate O atoms from four BDC 2− ligands and one pyridine N atom in a distorted square‐pyramidal coordination geometry. Four carboxylate groups bridge two Zn II ions to form centrosymmetric paddle‐wheel‐like Zn 2 (μ 2 ‐COO) 4 units, which are linked by the benzene rings of the BDC 2− ligands to generate a two‐dimensional layered structure. The two‐dimensional layer is extended into a three‐dimensional supramolecular structure with the help of π–π stacking interactions between the aromatic rings. Compound (II) has a one‐dimensional double‐chain structure based on Co 2 (μ 2 ‐COO) 2 units. The Co II cations are bridged by BDC 2− ligands and are octahedrally coordinated by three carboxylate O atoms from three BDC 2− ligands, one water O atom and two pyridine N atoms. Interchain O—H…O hydrogen‐bonding interactions link these chains to form a three‐dimensional supramolecular architecture.