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Crystal Structures and Magnetic Properties of 2D Supramolecular Architectures Assembled from Benzimidazolecarboxylato‐Bridged 1D Double‐Stranded Coordinating Chains Featuring Metallomacrocycles as Subunits
Author(s) -
Ma Shulan,
Zhang Die,
Gao Song,
He Yong,
Ma Hui,
Qi Chuanmin,
Fan Cuihong,
Chen Yufeng,
Yang Xiaojing
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800375
Subject(s) - chemistry , supramolecular chemistry , steric effects , crystallography , crystal structure , pyridine , stereochemistry , benzimidazole , ion , antiferromagnetism , medicinal chemistry , organic chemistry , physics , condensed matter physics
Two new 2D supramolecular architectures [{Mn 2 (L 1 ) 2 (H 2 O) 2 } · 2CH 3 OH] n ( 1 ) and [{Mn 2 (L 2 ) 2 (CH 3 OH) 4 } · 2CH 3 OH · 4(H 2 O)] n ( 2 ) were assembled from the newly synthesised semi‐rigid ligands H 2 L 1 {2,6‐bis[(6‐carboxy‐2,4‐dimethylbenzimidazol‐1‐yl)methyl]pyridine} and H 2 L 2 {2,6‐bis[(6‐carboxy‐4‐methyl‐2‐propylbenzimidazol‐1‐yl)methyl]pyridine} by reaction with Mn II ions. They both contain novel 1D double‐stranded coordinating chains with metallomacrocyclic subunits and dinuclear Mn II subrings bridged by benzimidazolecarboxylato ions, the latter derived from the ligands. The differences in the steric hindrance of the methyl and propyl groups attached to the benzimidazole rings in H 2 L 1 and H 2 L 2 led to different coordinating modes of the carboxylato groups and, thus, aesthetically fascinating extended structures with useful magnetic properties. Variable‐temperature susceptibility measurements (2–300 K) revealed antiferromagnetic coupling interactions ( J = –0.23 cm –1 for 1 and –0.92 cm –1 for 2 ) with values being within the reported range but differing from each other due to the distinct bridging modes of the carboxylato ions. The different crystal structures and magnetic properties of 1 and 2 are discussed in detail.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)