title: Di-pyridyl organic cation directed hybrid cuprous halogenides: syntheses, crystal structures and photochromism and photocatalysis.
abstract: By using 1,3-di(4-pyridyl)-propane (dpp) as templates or structure-directing agents (SDAs), a series of hybrid cuprous halogenides, namely, [H2dpp]2[Cu4I8]·H2O (1), [H2dpp][Cu2I4] (2), [H2dpp]2Cu11I15(3) and [H2dpp]2Cu11Br15(4), have been solvothermally prepared and structurally characterized. Despite the similar chemical compositions, compound 1 features a zero-dimensional (0D) [Cu4I8]4-unit and compound 2 contains one-dimensional (1D) [Cu2I4]2-chains, which are both separated by [H2dpp]2+organic cations. Compounds 3-4 contain two-dimensional (2D) microporous [Cu11X15]4-(X = I, Br) layers composed of the [Cu9X17] unit interconnected by [CuX4] tetrahedra. The UV-vis diffuse-reflectance measurements reveal that the compounds 3-4 exhibit semiconducting behaviors with narrow band gaps of 1.48 and 2.21 eV, respectively, which lead to efficient photocatalytic degradation activities over an organic pollutant under visible light irradiation. The possible photocatalytic mechanism is also proposed based on experimental and theoretical studies. Furthermore, compound 1 shows interesting photochromism behavior maybe owing to the photo-induced intermolecular charge transfer.
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Xiao-Wu
authors.identifier: http://orcid.org/0000-0003-4603-9093
authors.initials: XW
authors.lastname: Lei
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Xiamen University, Xiamen, Fujian 361005, P. R. China and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
authors.forename: Cheng-Yang
authors.initials: CY
authors.lastname: Yue
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Sai
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Gao
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.affiliation: Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, P. R. China. xwlei_jnu@163.com yuechengyang@126.com.
authors.forename: Yun-Dong
authors.initials: YD
authors.lastname: Yin