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Unusual Aggregation/Gelation‐Induced Phosphorescence of Propeller‐Type Binuclear Platinum(II) Enantiomers
Author(s) -
Gou Fei,
Cheng Jinghui,
Zhang Xiaohong,
Shen Guangyu,
Zhou Xiangge,
Xiang Haifeng
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600839
Subject(s) - chemistry , phosphorescence , intramolecular force , hydrogen bond , intermolecular force , enantiomer , amide , crystallography , stacking , photochemistry , stereochemistry , molecule , organic chemistry , physics , quantum mechanics , fluorescence
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 –NEt 2 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 –NEt 2 groups, enantiomer‐induced π–π stacking interactions, and strong multiple intermolecular H–C, H–O, and H–H interactions.