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The Aggregations and Strong Emissions of d8 and d10 Metal−8-Hydroxyquinaldine Complexes

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posted on 06.08.2008, 00:00 by Chengyang Yue, Feilong Jiang, Ying Xu, Daqiang Yuan, Lian Chen, Chunfeng Yan, Maochun Hong
Five new d8 and d10 metal complexes, Pd(8-hq)2 (1), [Ag(8-Hhq)2]NO3 (2), Ag(8-hq)(8-Hhq) (3), [(8-H2hq)2PdCl4]·2H2O (4), and Pt(8-hq)(tht)Cl (5) (tht = tetrahydrothiophene), all with a fluorogenic chelating agent, 8-hydroxyquinaldine (8-Hhq), have been synthesized and characterized. The aggregations of their photoactive metal centers through π−π stacking and hydrogen bonding interactions construct the interesting frameworks. The strong emissions of 13 and 5 in solid states with orange, cyan, and green luminescences originating from metal···metal and π−π interactions are assigned as metal to ligand charge transfer/metal–metal to ligand charge transfer/intraligand emissions. The solvent effects on their photophysical properties are examined, which exhibit a wide range of strong luminescences in the different organic solvents. In addition, time-dependent density functional theory calculations using the B3LYP functional on 1 are in good agreement with the experiments. Thermogravimetric analyses and UV/vis spectra with composition of certain simulated results are also reported.