Syntheses, structures, electrochemical and optical properties of four transition metal complexes based on the 1-triazolyl-3-benzimidazolyltriazene ligand

• Published in: RSC advances 2016-01, Vol.6 (6), p.4969-4978
• Main Authors: Qiu, Yanxuan, Miao, Yu, Wang, Zizhou, Li, Zhixin, OuYang, Zhijian, Yang, Liu, Lin, Wenning, Feng, Weijin, Dong, Wen
• Format: Article
• Language: English
• Subjects: Absorption spectra; Coordination compounds; Diffraction; Ethanol; Ethyl alcohol; Ligands; Photoluminescence; Transition metals
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c5ra21057g

Four transition metal complexes based on the 1-triazolyl-3-benzimidazolyltriazene (H 3 TBIT) ligand of [Co(H 2 TBIT)(HTBIT)] ( 1 ), {[Cu(H 2 TBIT)(SCN)]·H 2 O} ( 2 ), [Cd 2 (H 3 TBIT) 2 (H 2 O) 2 Cl 4 ] ( 3 ) and {[Ni 3 (H 2 TBIT) 2 (HTBIT) 2 (en) 2 ]·IPA·2H 2 O} (en = ethylenediamine, IPA = isopropanol) ( 4 ) have been synthesized and characterized by single crystal X-ray diffraction analysis. In 1-4 , the triazene ligand acts in different coordinating or bridging modes resulting in two mononuclear structures for 1 and 2 , one dinuclear structure for 3 and one trinuclear structure for 4 . Different structural 1-4 are further self-assembled through hydrogen bonds or π-π, C-H π or metal-π interactions to form 3D supramolecular structures. The electrochemical properties in aqueous solutions as well as the photoluminescent properties in ethanol of H 3 TBIT and 1-4 are investigated. The TD-DFT calculations at the B3LYP/6-311++G(d,p) level for H 3 TBIT has been used to demonstrate the characteristic absorption spectrum. The crystal structures, electrochemical and optical properties of four transition metal complexes based on 1-triazolyl-3-benzimidazolyltriazene (H 3 TBIT) ligand have been reported.