A series of Keggin-based compounds constructed by conjugate ring-rich pyrazine and quinoxaline derivatives

作者：Tian, Aixiang^*; Tian, Yan; Ning, Yali; Hou, Xue; Ni, Huaiping; Ji, Xuebin; Liu, Guocheng; Ying, Jun

来源：Dalton Transactions, 2016, 45(35): 13925-13936.

DOI：10.1039/c6dt02233b

• POLYOXOMETALATE-BASED COMPOUNDS
• HYDROTHERMAL SYNTHESIS
• COORDINATION POLYMERS
• CRYSTAL-STRUCTURE
• HYBRID MATERIALS
• COPPER-COMPLEX
• CLUSTERS
• FRAMEWORKS
• IMIDAZOLE
• LIGANDS

Through the use of conjugate ring-rich pyrazine and quinoxaline derivatives, five new Keggin polymolybdate based compounds, [(Ag3L21)-L-I(H2O) 2(PMo12O40)] (1), [(Ag4L51)-L-I(SiMo12O40)] (2), [(Ag6L62)-L-I(PMo12O40) 2] (3), [(Ag2L22)-L-I(C16H36N)(2)](SiMo12O40)] (4), [(Cu3L32)-L-I(PMo12O40)] (5) (L-1 = 2,3-diphenylpyrazine, L-2 = 2,3-diphenylquinoxaline, C16H36N = tetrabutylammonium), were synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. In compound 1, three Ag-I ions are fused by two L-1 molecules to form a [Ag3L21](3+) subunit, and these subunits link the PMo12 anions to construct two kinds of 1D chains (I and II). Chains I and II connect to each other by sharing the same PMo12 anions and a 2D grid-like layer is built. The asymmetric unit of compound 2 is linked to form a dimer by sharing Ag ions, and a 1D double strand is formed. The SiMo12 anions connect adjacent 1D double strands through Ag3-O23 bonds and a 2D network is built. In compound 3, there exists a 1D ladder-like double chain with PMo12 anions as linking bars. A 2D layer is formed by linkage Ag2-O24 between adjacent chains. In compound 4, the PMo12 anions act as inorganic linkages to connect adjacent zigzag chains through Ag1-O3 bonds to construct a 2D grid-like layer. In compound 5 two Cu-I-L-2 lines are fused by PMo12 anions to build a 1D ladder-like chain. Additionally, the electrochemical and photocatalytic properties of the title compounds have been studied.

• 出版日期2016
• 单位渤海大学