Cooperative Crystallization of Chiral Heterometallic Indium(III)–Potassium(I) Metal–Organic Frameworks as Photosensitizers in Luminescence Sensors and Dye-Sensitized Solar Cells

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• 作者：Xi Du ; Ruiqing Fan ; Xinming Wang ; Guangzhi Yu ; Liangsheng Qiang ; Ping Wang ; Song Gao ; Yulin Yang
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1737-1745
• 全文大小：660K
• ISSN：1528-7505

文摘

In this work, the coexistence of In(III) and K(I) induces a rapid crystal growth of single crystals of heterometallic metal–organic frameworks (MOFs), [In_0.5K(3-qlc)Cl_1.5(H₂O)_0.5]_2n (1) and [InK(ox)₂(H₂O)₄]_n (2) (3-Hqlc = quinoline-3-carboxylic acid; H₂ox = oxalic acid). Remarkably, with the help of achiral 3-Hqlc, compound 1 represents the chiral interpenetrating p-block heterometallic MOFs with helical chain along the 4₃ screw axis, while compound 2 possesses a highly symmetric (4,4,4)-connected topology network with a Schläfli symbol of (4²·8³·10)(4²·8⁴). Consideration of two different organic ligands viz. 3-Hqlc and H₂ox constructed heterometallic MOFs with different geometrical dimensions of unit cells, their influences on luminescence and photovoltaic properties are studied. Compounds 1 and 2 show tunable luminescence from blue to yellow and white by varying the temperature in the solid state. Encouraged by the UV–visible absorption and HOMO–LUMO energy states matched for sensitizing TiO₂, the two compounds are employed in combination with N719 in dye-sensitized solar cells (DSSCs) to compensate for absorption in the region of ultraviolet and blue-violet. Under optimized conditions, the DSSCs devices using cosensitizers of 1/N719 and 2/N719 display an overall conversion efficiency of 8.07% and 7.42%, which is 22.09% and 12.25% higher than that of a device solely sensitized by N719 (6.61%). Consequently, both of the two compounds could serve as excellent photosensitizers and application in luminescence sensors and DSSCs.