Synthesis, characterization and crystal structures of supramolecular complexes of copper(II)(2,2′-biimidazole) induced by inorganic counter anions

• Published in: Polyhedron 2010-01, Vol.29 (1), p.317-327
• Main Authors: Jin, Qiong-Hua, Zhou, Li-Li, Xu, Li-Jun, Zhang, Yuan-Yuan, Zhang, Cun-Lin, Lu, Xiao-Ming
• Format: Article
• Language: English
• Subjects: Biimidazole; Copper complexes; Crystal structures; Supramolecular complexes
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2009.05.052

Four new complexes [Cu(H 2biim) 2(H 2O)](NO 3) 2 ( 1), [Cu(H 2biim) 2](ClO 4) 2 · 2DMSO ( 2), [Cu(H 2biim) 2] [I 0.36·(NO 3) 0.64] 2 ( 3), {[Cu(H 2biim) 2(H 2O)](SiF 6)} · H 2O ( 4) (H 2biim = 2,2′-biimdazole) have been synthesized and characterized by X-ray crystallography. The unexpected anion SiF 6 2− in 4 was generated by the reaction of BF 4 − with glass container. Four new complexes [Cu(H 2biim) 2(H 2O)](NO 3) 2 ( 1), [Cu(H 2biim) 2](ClO 4) 2·2DMSO ( 2), [Cu(H 2biim) 2] [I 0.36·(NO 3) 0.64] 2 ( 3) and {[Cu(H 2biim) 2(H 2O)](SiF 6)}·H 2O (4) (H 2biim = 2,2′-biimdazole, DMSO = dimethyl sulfoxide) have been synthesized and characterized by X-ray diffraction. The different inorganic anions NO 3 - , ClO 4 - , [I 0.36·(NO 3) 0.64] − and SiF 6 2 - in these complexes lead to different 3D structures. Among them, complex 3 has an interesting 3D porous structure with two [I 0.36·(NO 3) 0.64] − ions as guests in the cavity. Compound 4 was obtained by the reaction of Cu(BF 4) 2 with H 2biim in water in glass bottle. The robust hydrogen bond of typeV R 2 1(7) played a key role in the formation of SiF 6 2 - in complex 4.