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| Mononuclear and Dinuclear Platinum(Ⅱ) Complexes Based on Ligands 2,3-Diphenylpyrazine or 2,3-Diphenylquinoxaline: Crystal Structures and Photophysical Properties |
| Author Name | Affiliation | E-mail | | LUO Kai-Jun | College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China | luo-k-j007@163.com | | GENG Hao | College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China | | | ZHANG Cheng-Yang | College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China | | | NI Hai-Liang | College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China | | | LI Quan | College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China | liquan6688@163.com |
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| Abstract: 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. |
| Keywords: synthesis mononuclear/dinuclear platinum(Ⅱ) complex crystal structure spectrum red-shift |
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| 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. |
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