[(H_(3)DIBA)_(2)Cl]·[HGeMo_(12)O_(40)]的合成、表征、光催化和电化学性质

Synthesis,characterization,photocatalytic and electrochemical properties of[(H_(3)DIBA)_(2)Cl]·[HGeMo_(12)O_(40)]

利用水热法合成了一种新的基于Keggin型杂多酸的无机-有机杂化物[(H_(3)DIBA)_(2)Cl]·[HGeMo_(12)O_(40)],(HDIBA=3,5-二(1H--咪唑-1-基)苯甲酸).单晶X-射线衍射测试表明,该化合物为三斜晶系,P-1空间群,a=1.27831(4)nm,b=1.29723(4)nm,c=1.98978(5)nm;α=94.51°,β=102.61°,γ=117.99°,V=2.77968(14)nm 3,Z=2.结构研究表明,在该化合物中HDIBA被质子化,配体与游离的Cl-之间通过氢键相互作用形成了一维超分子链状结构,Keggin型[GeMo_(12)O_(40)]^(4-)多酸阴离子与[H_(3)DIBA]^(2+)之间通过氢键作用将相邻的一维超分子链连接形成三维超分子结构.该化合物可以光催化降解有机染料孔雀石绿,150 min内降解率达到99.99%;另外,该化合物具有电催化还原BrO_(3)^(-)和电催化氧化抗坏血酸(AA)的性质.总之,该化合物可以作为一种有效处理废水中污染物的异相光、电催化剂.

A new inorganic-organic hybrid[(H_(3)DIBA)_(2)Cl]·[HGeMo_(12)O_(40)](HDIBA=3,5-bis(1H-imidazol-1-yl)benzoic acid)based on Keggin-type polyoxometalate anion was synthesized by hydrothermal synthesis,in which HDIBA was a tridentate organic ligand containing two imidazole and one carboxyl groups.The results showed that the compound is triclinic,space group P-1,a=1.27831(4)nm,b=1.29723(4)nm,c=1.98978(5)nm,α=94.51°,β=102.61°,γ=117.99°,V=2.77968(14)nm 3,and Z=2.The HDIBA in the compound is protonated,and a one-dimensional supramolecular chain is formed by hydrogen bonding interactions between the organic ligand and free Cl^(-).There are hydrogen bonding interactions between[GeMo_(12)O_(40)]^(4-)polyoxoanions and[H_(3)DIBA]^(2+),which connect the adjacent one-dimensional supramolecular chains into a three-dimensional supramolecular structure.The compound can degrade the organic dye Malachite green by photocatalysis,and the degradation rate reaches 99.99%in 150 min.In addition,electrochemical studies found that the compound has the properties of electrocatalytic reduction of BrO_(3)^(-)and electrocatalytic oxidation of ascorbic acid.In brief,the compound is an effective heterogeneous photocatalyst and electrocatalyst for the treatment of pollutants in wastewater.