A new luminescent platinum(II) chloride complex of 6-(5-trifluoromethyl-1,2,4-triazol-3-yl)-4,4′-dimethyl-2,2′-bipyridine

• Published in: Inorganic chemistry communications 2013-09, Vol.35, p.96-99
• Main Authors: Chen, Jing-Lin, Chen, Xiu-Xiu, Tan, Xiu-Zhen, Wang, Jin-Yun, Fu, Xing-Feng, He, Li-Hua, Li, Yang, Zhong, Gui-Quan, Wen, He-Rui
• Format: Article
• Language: English
• Subjects: 2,2′-Bipyridyl 1,2,4-triazole; Crystal structure; Photoluminescence; Platinum(II)
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2013.06.008

A new Pt(II) chloride complex Pt(ftmbpy)Cl (1) with deprotonated 6-(5-trifluoromethyl-1,2,4-triazol-3-yl)-4,4′-dimethyl-2,2′-bipyridine terdentate ligand has been synthesized and characterized. Complex 1 gives a distorted square-planar configuration with a mono-anionic chelate ftmbpy, and displays a 1-D zigzag head-to-tail arrangement along the b axis formed via intermolecular π⋯π stacking and Pt⋯Pt interactions. A relatively weak broad absorption is observed at 360–435nm in dilute CH2Cl2 solution at room temperature, tentatively ascribed to metal-to-ligand charge transfer (1MLCT) excited state with some mixing of intra-ligand 1ππ* character inside ftmbpy, as supported by TD-DFT analysis. It is demonstrated that complex 1 is emissive in both solution and solid states and exhibits the concentration-dependent luminescence properties originating from intermolecular Pt⋯Pt and π⋯π interactions, and the introduction of substituents (e.g. two methyl groups) into the 2,2′-bipyridyl ring is effective for improving the solubility of Pt(II) complexes. A new emissive Pt(II) chloride complex Pt(ftmbpy)Cl (1) with deprotonated 6-(5-trifluoromethyl-1,2,4-triazol-3-yl)-4,4′-dimethyl-2,2′-bipyridine chelate has been synthesized and characterized. Complex 1 displays a 1-D zigzag head-to-tail packing array along the b axis and the concentration-dependent luminescence properties as a result of intermolecular Pt···Pt and π···π interactions. [Display omitted] •A new Pt(II) chloride complex Pt(ftmbpy)Cl (1) with deprotonated ftmbpyH chelate.•Complex 1 displays a 1-D zigzag head-to-tail packing array along the b axis.•The photoluminescence of 1 is observed in both solution and solid states.•A concentration-dependent emission originating from the Pt–Pt and π–π interactions.•The substituents on 2,2′-bipyridyl markedly affect the solubility of Pt complexes.