Citation: LUO Kai-Jun, GENG Hao, ZHANG Cheng-Yang, NI Hai-Liang, LI Quan. Mononuclear and Dinuclear Platinum (Ⅱ) Complexes Based on Ligands 2, 3-Diphenylpyrazine or 2, 3-Diphenylquinoxaline: Crystal Structures and Photophysical Properties[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(3): 405-414. doi: 10.11862/CJIC.2017.026 shu

Mononuclear and Dinuclear Platinum (Ⅱ) Complexes Based on Ligands 2, 3-Diphenylpyrazine or 2, 3-Diphenylquinoxaline: Crystal Structures and Photophysical Properties

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China

Corresponding author: LUO Kai-Jun, luo-k-j007@163.com LI Quan, liquan6688@163.com
Received Date: 19 July 2016
Revised Date: 21 November 2016

Figures(9)

Luminescent mononuclear platinum (Ⅱ) complexes, [Pt (Hdpp)(acac)] (1), [Pt (Hmdpp)(acac)] (3) and [Pt (Hdpq)(acac)] (4) and dinuclearnum (Ⅱ) complex, [Pt₂(dpp)(acac)₂] (2) were obtained by using 2, 3-diphenylp-yrazine (H₂dpp), 5-methyl-2, 3-diphenylpyrazine (H₂mdpp) and 2, 3-diphenylquinoxaline (H₂dpq) as ligands. It is noted that the maximal emission peak value for dinuclear complex 2 is at 609 nm, which has red-shift of about 63 nm compared with its analogue mononuclear complexes 1 and 3, although they seem somewhat analogue in lowest energy absorption band. To examine the cause of anomalous lower emission for dinuclear complex 2, the single crystals for complexes 2, 3 and 4 were grown from dichloromethane and methanol solution. It is found that dinuclear platinum (Ⅱ) complexes 2 incorporating 2, 3-diphenylpyrazine-based bridging ligand has more twisted conformation in the ground than its mononuclear analogue, complexes 3, which has similar structure with complex 1. Furthermore, lowest energy band for dinuclear complex 2 in exciting spectrum shows red-shift of 18 nm compared with its absorption spectrum. The twisted geometry in ground and red-shifted exciting spectrum make us infer reasonably that dinuclear complex 2 may undergo a more profound change from twisted geometry to planar conformation before emission, which led a lower triplet excited sate, resulting in the red-shifted emission of the dinuclear complex 2.
- synthesis,
- mononuclear/dinuclear platinum (Ⅱ) complex,
- crystal structure,
- spectrum red-shift
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