Synthesis, Structure and Luminescent Property of a New Zinc(Ⅱ) Complex

One new coordination polymer, namely {[Zn（HL）（Hbipy）]2·3H2O}n（bipy = 4,4A-bipyridine, H4 L = 6-（3＇,4＇-dicarboxyl-phenoxy） isophthalic acid）, has been synthesized through a hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectra（IR）, and thermogravimetric（TG） analysis. The crystal structure is of monoclinic, space group P21/n with a = 9.6435（3）, b = 19.8515（7）, c = 12.9731（5） A, β = 103.023（4）o, V = 2419.67（15） A3, C52H38Zn2N4O21, Mr = 1185.6, Z = 2, Dc = 1.619 g/cm^3, F（000） = 1200, μ = 1.083 mm-1, the final R = 0.0443 and w R = 0.1079 for 4269 observed reflections（I 2σ（I）. The compound features a two-dimensional（2D） framework and stabilizes itself by interlayer π···π interactions and innerlayer hydrogen bonds. The 2D layer presents a simple 3-connected 63 topology. Moreover, the thermal dynamic stability and luminescent property of the compound have also been discussed in detail.

液相原位还原法制备钯基催化剂

采用液相原位还原法制备Pd/α-Al2O3催化剂,并应用于CO氧化偶联合成草酸二甲酯反应。对比实验发现,甲醛液相原位还原法制得的Pd基催化剂具有优异的催化活性,当Pd负载质量分数低至0.1%时,催化剂仍表现出较高的活性和稳定性。采用XRD和BET等对催化剂及载体进行表征,结果表明,催化剂活性与载体的比表面积、孔容和孔径没有必然联系。通过TEM发现,0.1%-Pd/α-Al2O3催化剂中的主要活性组分Pd具有较小的颗粒和较高的分散性,通过HRTEM发现,液相原位还原法制备的催化剂能够有效暴露出Pd(111)晶面。