Phosphorescent Zwitterionic Pt(Ⅱ) N-Heterocyclic Allenylidene Complexes:Metallophilicity and Ionic Self-Assembly

• 作者: Qin Gao Fei Peng Chuanfei Wang Jinqiang Lin Xiaoyong Chang Chao Zou Wei Lu
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Concise Reports
• 页码范围: 1159-1167
• 页数: 9页
• 语种: 英文
• DOI: 10.1002/cjoc.202000674

摘要

Main observation and conclusion Three zwitterionic and one cationic N-heterocyclic allenylidene (NHA) platinum(Ⅱ) complexes were prepared and characterized via NMR,HR-MS,and FT-IR,etc.Single crystal structure analyses revealed the various intermolecular packing modes via multiple noncovalent interactions (short Pt…Pt contacts,π-π interactions).The spectroscopic data demonstrated stability of the allenylidene metal complexes is largely ascribed to the resonance structures of zwitterionic acetylide.The zwitterionic and analogue cationic NHA Pt(Ⅱ) monomers showed similar steady-state photoluminescent properties in dilute fluid solution.Highly efficient solid-state phosphorescent emissions (quantum yield up to 20％) of these NHA Pt(Ⅱ) complexes are correlated with their dispersive metallophilic Pt…Pt interactions.HR-MS spectrum indicated zwitterionic monomers can self-assemble into oligomers,such as dimer,trimer and even hexamer in a mixed H2O/MeOH solvent.Meanwhile,molecular aggregates showed variable red-shifted phosphorescence by manipulating the concentration,temperature,time and solvent in the self-assembly of zwitterionic NHA platinum(Ⅱ) complex.