d 7 /d 8 Metal Complexes Constructed from 2,6‐Bis(2‐benzimidazolyl)pyridyl or 2,6‐Di‐(pyrazol‐3‐yl)pyridine Derivatives: Synthesis, Structure, Characterization, and Photocatalytic Activity

作者：Si Yue Wei, Jian Ling Wang, Cai Shun Zhang, Xue‐Ting Xu, Xiao Xi Zhang, Ji Xiao Wang, Yong‐Heng Xing · 发表于：ChemPlusChem · 年份：2014 · DOI：10.1002/cplu.201402255 · 被引用次数：9 · 研究领域：Metal complexes synthesis and properties、Metal-Organic Frameworks: Synthesis and Applications、Multicomponent Synthesis of Heterocycles

Abstract By introducing 2,6‐bis(2‐benzimidazolyl)pyridyl and 2,6‐di‐(pyrazol‐3‐yl)pyridine derivatives as ligand in the reaction system, three new transition‐metal coordination complexes have been successfully synthesized, namely, [Co(HL 1 ) 2 ] ( 1 ), [Ni(HL 1 ) 2 ] ( 2 ), and [Ni 3 (H 2 L 2 ) 2 ⋅ (HL 2 ) 2 ] ⋅ (OH) 3 ⋅ (Ac) ⋅ H 2 O ( 3 ) (H 2 L 1 =2,6‐bis(benzimidazol‐2‐yl)pyridine and H 2 L 2 =2,6‐di‐(5‐phenyl‐1 H ‐pyrazol‐3‐yl)pyridine). They are all characterized by elemental analysis, IR spectroscopy, UV absorption spectroscopy, thermogravimetric analysis, powder X‐ray diffraction, and single‐crystal X‐ray diffraction. Structural analysis shows that the structures of complexes 1 and 2 are similar. They are constructed from one metal (Co, Ni) atom and two 2,6‐bis(benzimidazol‐2‐yl)pyridine ligands (HL 1 − ); the HL 1 − ligand is in the tridentate coordination mode with N3 donors. Complex 3 is a trinuclear Ni complex with four 2,6‐di‐(5‐phenyl‐1 H ‐pyrazol‐3‐yl)pyridine (H 2 L 2 ) ligands, in which the H 2 L 2 possesses two coordination fashions: terminal tridentate and bridging tetradentate. In addition, the surface photovoltage spectroscopy and photocatalytic activities of complexes 1 – 3 were investigated in detail. The results reveal that complex 3 possesses higher photocatalytic activity.