Solvent and pH Driven Self-Assembly of Isomeric or Isomorphic Complexes: Crystal Structure and Luminescent Change upon Desolvation
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- 作者：Run-Ping Ye ; Xin Zhang ; Lei Zhang ; Jian Zhang ; Yuan-Gen Yao
- 刊名：Crystal Growth & Design
- 出版年：2016
- 出版时间：July 6, 2016
- 年：2016
- 卷：16
- 期：7
- 页码：4012-4020
- 全文大小：705K
- 年卷期：0
- ISSN：1528-7505
文摘
Three Cd(II) supramolecular isomers, namely, [Cd(IDPA)(H2O)]n·2n(H2O) (1), [Cd2(IDPA)2(H2O)3]n·n(DMF)·4n(H2O) (2), [Cd3(IDPA)3(DMA)(H2O)2n]·n(DMA)·n(H2O) (3), and two Cu(II) isomorphic complexes including [Cu(IDPA) (DMF)]n (4) and [Cu(IDPA)(H2O)]n (5) (DMF = N,N-dimethylformamide; DMA = N,N-dimethylacetamide; H2IDPA = 5-(1-oxoisoindolin-2-yl) isophthalic acid), have been synthesized under similar solvothermal conditions with different solvent systems and pH values. However, complexes 1 and 3 share an unanticipated 2D layered structure while complex 2 presents an unprecedent topological network with a new point symbol of {4·62}{4·67·82}. Complexes 4 and 5 have been generated from [Cu2(COO)4] paddlewheels as the 4-connected node with the point symbol of {64·82}. The diverse structures of 1–5 can be much related with hydrogen bonds and π–π interactions. Furthermore, the luminescent properties of complexes 1–3 have been investigated before-and-after desolvation by heating at 220 °C for 2 h. Interestingly, the quantum yield of complex 2 is changed from 37.20% to 10.73% after desolvation. These results indicate that solvent molecules actually enhance the photoluminescence instead of quenching it. The construction of these complexes shows that the solvent and pH value can regulate the crystal structure and luminescent properties.