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Construction of Metal–Organic Frameworks Consisting of Dinuclear Metal Units Based on 5‐Hydroxyisophthalate and Flexible Dipyridyl Ligands
Author(s) -
Li Xiaoju,
Guan Tena,
Guo Xiaofang,
Li Xinxiong,
Yu Zhenjiang
Publication year - 2014
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.201400092
Subject(s) - chemistry , metal , crystallography , antiferromagnetism , metal ions in aqueous solution , crystal structure , stereochemistry , ion , organic chemistry , physics , condensed matter physics
Four Co II and Cu II complexes, namely, [Co 2 (ip‐OH) 2 (dpe)] n [ 1 ; ip‐OH = 5‐hydroxyisophthalate, dpe = 1,2‐di(4‐pyridyl)ethane], [Co 2 (ip‐OH) 2 (dpy) 2 ] n (dpy) n (H 2 O) 2 n [ 2 ; dpy = 1,2‐di(4‐pyridyl)ethylene], [Cu 2 (ip‐OH) 2 (dpe)] n ( 3 ), and [Cu 2 (ip‐OH) 2 (dpy)] n ( 4 ), were hydrothermally synthesized and characterized. Single‐crystal X‐ray diffraction studies reveal that 1 – 4 consist of different dinuclear metal units, ip‐OH possesses different coordination modes, and both dpe and dpy adopt anti conformations. In 1 , the ip‐OH ligands link dinuclear Co II units into a charge‐neutral [Co 2 (ip‐OH) 2 ] n layer, which is further connected by pillars of dpe to generate a twofold interpenetrating 3D network. However, dinuclear Co II units in 2 are bridged by ip‐OH to form a 1D [Co 2 (ip‐OH) 2 ] n chain, which is further connected by dpy into a 2D network consisting of the prismatic building blocks [Co 8 (ip‐OH) 8 (dpy) 8 ]. Similarly to 1 , 3 and 4 are twofold interpenetrating α‐Po architectures, despite the different ip‐OH bridging modes and different coordination geometries of the metal ions. The dinuclear units in 1 – 4 are well separated by ip‐OH and dpe/dpy ligands. The magnetic data of 1 – 3 are fitted according to the dimeric modes, and the results of the best fit indicate the existence of antiferromagnetic exchange between the metal centers in the dinuclear metal units.