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二维钡钨双金属膦酸配位聚合物的合成、结构及荧光研究
Synthesis,Structure and Fluorescent Property of 2-D Diphosphonate Coordination Polymer with Bimetallic Ba(Ⅱ) and W(Ⅵ)
【摘要】 水热条件下,以2,2’-联吡啶(2,2’-bipy)为结构导向剂,利用Ba(II)盐,硅钨酸与1-羟基-2-(3-吡啶基)亚乙基-1,1-二膦酸(H5L=(H4C5N)CH2C(OH)(PO3H2)2)反应,得到二维钡钨双金属膦酸配位聚合物{[Ba2(L-H)(H2O)2(WO3)]·H2O}n(化合物1).该化合物为单斜晶系,C2/c空间群,晶胞参数:a=2.305(2)nm,b=0.7310(5)nm,c=2.033(1)nm,β=93.160(7)°,V=3.420(4)nm3,Z=8,R1=0.0293,ωR2=0.0702.单晶X-射线衍射分析表明其具有二维双金属无机层状结构.荧光测试结果表明,在236nm发射波长下,出现2个来自于膦酸分子内(λem=380.5nm,437.5nm)π*-π跃迁的荧光发射峰:λem=317nm,445.5nm.
【Abstract】 A coordination polymer example,{ [Ba2(L-H)(H2O)2(WO3) ]·H2O}n2 based on 1-hydroxy-2-(3-pyridyl) ethylidene-1,1-diphosphonate acid(H5 L =(H4C5N) CH2C(OH)(PO3 H2)2,HxL-H =(H4C5N-H) CH2C(OH)(PO3H2)2,x = 0 5),has been obtained by using hydrothermal technique. It is characterized by powder X-ray diffraction,elemental analysis,IR,TG-DTA. Complex 1 crystallizes in monoclinic,space group C2/c with a = 23. 05(2) 7)A,b = 7. 310(5) 7)A,c = 20. 33(1) 7)A,V = 3420(4) 7)A3,Z = 8,C7H13Ba2NO13P2W,Mr= 839. 65,Dc= 3. 261 Mg·m-3,μ = 11. 520 mm-1,F(000) = 3056,Rint=0. 0430,R = 0. 0293 and wR = 0. 0702. Fluorescent measurements reveal that the two maximum emission peaks of 1 are centered at 317 nm,445. 5 nm,mainly deriving from intraligand π*-π transition state of ligand H5 L(λem= 380. 5 nm,437. 5 nm) under the excited band of 235 nm.
【Key words】 alkaline-earth metal; phosphonate; crystal structure; fluorescence;
- 【文献出处】 淮阴师范学院学报(自然科学版) ,Journal of Huaiyin Teachers College(Natural Science Edition) , 编辑部邮箱 ,2017年04期
- 【分类号】O641.4
- 【下载频次】88