One-dimensional silver(I) and mercury(II) complexes with 1,4-bis(1-benzyl-benzimidazol-2-yl)cyclohexane ( N-BBzBimCH)

• Published in: Inorganica Chimica Acta 2007-06, Vol.360 (9), p.2990-2996
• Main Authors: Li, Xiang-Ping, Zhang, Jian-Yong, Liu, Yu, Pan, Mei, Zheng, Sheng-Run, Kang, Bei-Sheng, Su, Cheng-Yong
• Format: Article
• Language: English
• Subjects: 1D chain; Fluorescence; Mercury(II) complex; N-ligand; Silver(I) complex
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2007.02.024

Four one-dimensional Ag(I) and Hg(II) complexes of a newly synthesized ligand 1,4-bis(1-benzyl-benzimidazol-2-yl)cyclohexane ( N-BBzBimCH) have been reported, in which different counter anions play different roles to sustain the chain structure. Various weak intermolecular interactions such as C–H⋯X (X = Cl, Br) contacts, hydrogen bonds, π–π interactions and C–H⋯π stacking also play important roles to extend the 1D chain structures into 2D network. The crystal structures of four Ag(I) and Hg(II) complexes of the ligand 1,4-bis(1-benzyl-benzimidazol-2-yl)cyclohexane ( N-BBzBimCH) have been described, that is, [Hg 2( N-BBzBimCH)Cl 4] ( 1), [Hg( N-BBzBimCH)Br 2] ( 2), [Ag( N-BBzBimCH)](NO 3)(H 2O) ( 3) and [Ag 2( N-BBzBimCH)(CF 3OCO) 2] ( 4). All these compounds show 1D polymeric structures in the solid state. In complexes 1 and 4, the chloride ions and the trifluoroacetate groups bridge the [Hg 2( N-BBzBimCH)Cl 2] and [Ag 2( N-BBzBimCH)] fragments, respectively, to generate 1D polymers. While the bromide ions in complex 2 and nitrate groups in complex 3 are only serving as terminal ligands to suffice the coordination geometry of the metal centers. In all cases, weak intermolecular interactions such as C–H⋯X (X = Cl, Br) contacts, hydrogen bonds, π–π interactions and C–H⋯π stacking play important roles to extend the 1D chain structures to 2D network. Solid state fluorescence of these compounds was also studied.