Three Highly Fluorescent Iridium(III) Unit Based Coordination Polymers: Coordinated Solvent-Dependent Photoluminescence

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• 作者：Yingying Xu ; Lina Li ; Shuquan Zhang ; Sangen Zhao ; Junhua Luo
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：January 6, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：406-411
• 全文大小：361K
• ISSN：1528-7505

文摘

Three highly luminescent coordination polymers were solvothermally synthesized in three different solvents, i.e., H₂O, DMF (DMF = N,N-dimethylformamide), and DEF (DEF = N,N-diethylformamide) based on a superiorly luminescent Ir(III) unit (L, L = Ir(ppy)₂(Hdcbpy)^?, ppy = 2-phenylpyridine, dcbpy = 2,2′-bipyridine-4,4′-dicarboxylate). The three CPs, [MgL₂(H₂O)₂]·3.5H₂O [1], [MgL₂(DMF)₂]·3.5H₂O [2], and [MgL₂(DEF)(H₂O)]·3H₂O [3], exhibit intense emissions, long fluorescence lifetimes, and high quantum yields. In particular, compound 2 shows a very long fluorescence lifetime up to 11.3 μs and high quantum yield up to 18.1%. Attractively, it was found that the luminescence of 1–3 varied from yellow to orange under the irradiation of UV light. The distinct luminescence of 1–3 probably is due to different coordinated solvents in the three compounds.