两种砷钼杂化多酸盐的合成、 结构及变色性质

分别以2种V形羧酸1,3-苯二甲酸(H₂BDC)和5-羟基-1,3-苯二甲酸(H₂OIP)]与钼酸铵进行反应, 得到了 2种有机酸根与无机酸根缩合构成的杂化砷钼酸盐： (NH₄)₁₇H₄(AsMo₆O₂₁)₂(AsMo₆O₂₃)(BDC)₄]·28H₂O(1)和 (NH₄)₅Cs₈H₆(AsMo₆O₂₁)₃(OIP)₅]·40H₂O(2). 利用单晶X射线衍射对2种化合物进行了结构分析, 发现二者均为三聚结构. 对2种化合物的光致变色及热致变色性质进行了研究, 发现在氙灯照射下2种化合物均可在5 min内变色. 当将2种化合物的样品加热到373 K时, 均出现颜色变化, 并随着温度升高颜色逐渐加深. 光致变色与热致变色过程前后的EPR检测结果均提示化合物的颜色变化与Mo^VI转化为Mo^V有关.

Synthesis,Structure,and Allochroic Property of Two Hetro-arsenomolybdates Hybrid Polyoxometalates

Benzene-1，3-dicarboxylic acid（H₂BDC） and 5-hydroxy-1，3-benzene dicarboxylic acid（H₂OIP） have been employed to synthesis two organic-inorganic hybrid arsenomolybdates， （NH₄）₁₇H₄［（AsMo₆O₂₁）₂（AsMo₆O₂₃）（BDC）₄］·28H₂O（1） and （NH₄）₅Cs₈H₆［（AsMo₆O₂₁）₃（OIP）₅］·40H₂O（2）. X-Ray crystallographic study indicated that both of the two compounds are trimers. The photochromic properties have been studied. Under the irradiation of a Xe-lamp， the two compounds changed their colors within 5 min. The thermochromic study of the two compounds indicated that they changed color at 373 K， and their color deepened on the increase of temperature.