Two Zinc Based Coordination Compounds Constructed from Two Azophenyl Ligands: Syntheses, Crystal Structure, and Photocatalytic Performance
文摘
Two novel coordination compounds based on zinc ions, 1,10-phenanthroline (phen) and two similar azophenyl ligands, 3,4-dicarboxyl-(3′,4′-dicarboxylazophenyl) benzene (3,4-H4dczpb), as well as 2,3-dicarboxyl-(2′,3′-dicarboxylazophenyl)benzene (2,3-H4dczpb), namely [Zn(phen)(2,3-H2dczpb)(H2O)]·H2O (1), and [Zn2(phen)4(3,4-H2dczpb)](3,4-H4dczpb)2·2H2O (2), have been synthesized under hydrothermal conditions, and characterized by single crystal X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), CHN elemental analysis, thermogravimetric analysis (TGA) and UV–Visible diffuse reflectance spectra (UV–Vis DRS). Compound 1 was built up of one-dimensional [Zn(phen)(2,3-H2dczpb)(H2O)] chains, while compound 2 was composed of zero-dimensional discrete [Zn2(phen)4(3,4-H2dczpb)] unit and uncoordinated 3,4-H4dczpb. The UV–Vis DRS results revealed that the E g values of compounds 1 and 2 are 3.0 and 2.9 eV, respectively, implying that both 1 and 2 illustrate selective absorption in the ultraviolet region. The photocatalytic activities of degradation of methylene blue (MB) in compounds 1 and 2 under UV light irradiation were conducted, and the results revealed that both 1 and 2 can decompose MB efficiently. Finally, the TGA results exhibited 1 and 2 possess good thermal stability. Keywords Coordination compound Thermal stability Optical energy gap Photocatalysis Degradation