摘要
Two Cd（Ⅱ） coordination polymers have been synthesized with pyrazine-1,4-dioxide （L1）, 2-methylpyrazine-1,4-dioxide （L2）, and thiocyanate anion as mixed bridge ligands. Crystal data for complex 1 [Cd（μ1,3-SCN^-）2（L1）]n： monoclinic system, space group P21/n with a = 6.8342（11）, b = 14.349（2）, c = 10.5443（16）°A,β = 98.534（2）°, V = 1022.5（3）°A^3 Z = 4, C6H4CdN4O2S2, Mr = 340.65, Dc = 2.213 g/cm^3, F（000） = 656 and u = 2.527 mm^-1; and those for 2： triclinic system, space group P/ with a = 7.877（3）, b = 8.693（3）, c = 8.754（3） °A, α= 102.297（6）,β= 102.464（6）, γ= 98.480（6）°, V= 560.0（3） °A^3, Z = 2, CTH6CdN4O2S2, Mr = 354.68, Dc = 2.103 g/cm^3, F（000） = 344 and μ= 2.311 mm^-1. 1 shows a three-dimensional network structure, and along the c direction a one-dimensional chain is constructed by the coordination of Cd（Ⅱ） ions with μ1,3-SCN^- ligands, and the L1 bridging ligands made the chains connect each other leading to the formation of a three-dimensional structure. For 2, the one-dimensional chains along the b axis are generated by the coordination of L2 bridging ligands with Cd（Ⅱ） ions, and the chains are further joined by μ1,3-SCN^- bridging ligands forming a two-dimensional sheet structure on the （10 -1 ） plane. Both complexes 1 and 2 exhibit strong fluorescence emission.
Two Cd（Ⅱ） coordination polymers have been synthesized with pyrazine-1,4-dioxide （L1）, 2-methylpyrazine-1,4-dioxide （L2）, and thiocyanate anion as mixed bridge ligands. Crystal data for complex 1 [Cd（μ1,3-SCN^-）2（L1）]n： monoclinic system, space group P21/n with a = 6.8342（11）, b = 14.349（2）, c = 10.5443（16）°A,β = 98.534（2）°, V = 1022.5（3）°A^3 Z = 4, C6H4CdN4O2S2, Mr = 340.65, Dc = 2.213 g/cm^3, F（000） = 656 and u = 2.527 mm^-1; and those for 2： triclinic system, space group P/ with a = 7.877（3）, b = 8.693（3）, c = 8.754（3） °A, α= 102.297（6）,β= 102.464（6）, γ= 98.480（6）°, V= 560.0（3） °A^3, Z = 2, CTH6CdN4O2S2, Mr = 354.68, Dc = 2.103 g/cm^3, F（000） = 344 and μ= 2.311 mm^-1. 1 shows a three-dimensional network structure, and along the c direction a one-dimensional chain is constructed by the coordination of Cd（Ⅱ） ions with μ1,3-SCN^- ligands, and the L1 bridging ligands made the chains connect each other leading to the formation of a three-dimensional structure. For 2, the one-dimensional chains along the b axis are generated by the coordination of L2 bridging ligands with Cd（Ⅱ） ions, and the chains are further joined by μ1,3-SCN^- bridging ligands forming a two-dimensional sheet structure on the （10 -1 ） plane. Both complexes 1 and 2 exhibit strong fluorescence emission.
基金
This work was supported by the National Natural Science Foundation of China (No. 20271043) and Natural Science Foundation of Shandong Province (Y2005B25)
