The title coordination polymer,[Zn(Pyphen)(PZDC)(H2O)](1) (Pyphen=pyrazino[2,3-f][1,10]phen-anthroline and H2PZDC=pyrazine-2,3-dicarboxylic acid) has been obtained by using hydrothermal synthesis and characterized by elemental analysis,IR,TG,fluorescence spectrum and X-ray diffraction single-crystal structure analysis.The crystal is of triclinic,space group P1 with a=0.681 8(14) nm,b=0.743 9(15) nm,c=1.759 8(35) nm,α=94.329(30) °,β=95.514(30) °,γ=97.043(3) °,V=0.878 2(3) nm3,Z=2,Mr=481.73,Dc=1.822 g·cm-3,μ=1.452 mm-1,F(000) =448,Rint=0.033 9,R=0.042 5,wR=0.090 7.In complex 1,PZDC ligands link the Zn(Ⅱ) ions to form 1D chain structures,and further extended into a 3D supramolecular framework through π-π interactions and hydrogen bonding interactions.In addition,complex 1 exhibits strong photoluminescence at room temperature.CCDC:649569.
为应对突发灾害,城市需提供应急避难所保障人民群众生命安全,应急避难所的选址应充分考虑其合理性与适宜性.从地形因素、环境因素、公平性及可达性4个一级指标出发,选取了9个二级指标为应急避难所选址的评价指标.应用层次分析法确定评价指标的权重体系,应用逼近理想解排序法(Technique for Order Preference by Similarity to an Ideal Solution,TOPSIS)对长春市中心城区10处候选应急避难所选址进行了适宜性排序.结果表明:本文所构建的评价体系科学合理,便于数据的获取和量化,TOPSIS方法的应用能够系统地评估不同候选避难所的优劣;所选10处候选应急避难所优良级均为中等以上,其中两处为优.从而为城市管理者进行应急避难所选址提供了科学依据.
