Unusual Aggregation/Gelation-Induced Phosphorescence of Propeller-Type Binuclear Platinum(II) Enantiomers

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• 作者：Fei Gou ; Jinghui Cheng ; Xiaohong Zhang ; Guangyu Shen ; Xiangge Zhou and Haifeng Xiang
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：2016
• 期：30
• 页码：4862-4866
• 全文大小：1541K
• ISSN：1099-0682c

文摘

Three binuclear cyclometalated Pt^II complexes, [(ppy)Pt(µ-SA)Pt(ppy)] (ppy = 2-phenylpyridine, SA: salicylaldehyde azine), have been synthesized and characterized. Owing to the blockage of the intramolecular rotation of the bridging SA ligands, all three complexes exhibit propeller-type enantiomers and aggregation-induced phosphorescence (AIP). Interestingly, one complex with –NEt₂ groups instead of long alkyl chains, amide, urea peptides, cholesterol, sugar, or steroidal groups was found to show strong phosphorescence enhancement gated by the gelation process. This unusual gelation behavior is rarely encountered, as the metallogel has no intermolecular hydrogen bonding or Pt–Pt interactions. We attribute the driving force of this gelation-induced phosphorescence (GIP) to the propeller-type structure, optimally balanced solubility of –NEt₂ groups, enantiomer-induced π–π stacking interactions, and strong multiple intermolecular H–C, H–O, and H–H interactions.