Linear Bimetallic Alkynylplatinum(II) Terpyridyl Complexes Bearing p-Phenylene Ethynylene Oligomers: Synthesis, Characterization, Aggregation, and Photophysical Properties

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• 作者：Peng Xu ; Haotian Wu ; Hongxing Jia ; Shifan Ye ; Pingwu Du
• 刊名：Organometallics
• 出版年：2014
• 出版时间：June 9, 2014
• 年：2014
• 卷：33
• 期：11
• 页码：2738-2746
• 全文大小：507K
• 年卷期：v.33,no.11(June 9, 2014)
• ISSN：1520-6041

文摘

The series of luminescent bimetallic alkynylplatinum(II) terpyridyl complexes [(tBu₃-tpy)PtC鈮(ArC鈮)_nPt(tBu₃-tpy)](PF₆)₂ (I鈥?b>IV; tBu₃-tpy = 4,4鈥?4鈥?tritertbutyl-2,2鈥?6鈥?2鈥?terpyridine, Ar = C₆H₂(n-hexyloxy)₂-2,5), in which two platinum(II) centers are linked by p-phenylene ethynylene oligomers, were synthesized and characterized. Their electronic absorption and luminescent behaviors were studied by steady-state spectroscopy and transient spectroscopy. Concentration-dependent emission data show that all of the complexes form self-assembled aggregates in certain concentration ranges. Complex IV, bearing a longer p-phenylene ethynylene oligomer, exhibits higher propensity in comparison to I鈥?b>III to form aggregates at a concentration of >1 脳 10^鈥? M, probably resulting from stronger metal鈥搈etal interactions and 蟺鈥撓€ stacking. All four of the complexes displayed biexponential decays with lifetimes in the range of nanoseconds in dilute solutions.