有机-无机杂化物：合成·表征·光致变色特性

用溶液法合成2种新型结晶化的有机-无机杂化物La2K(PMo₁₂O₄₀)(EDTA)₄（1）和Ni(PW₁₂O₄₀)(EDTA)₂（2）.利用红外光谱（IR)、差热-热重分析（TG-DTA）、循环伏安（CV)、固体荧光光谱(FL)、紫外-可见漫反射光谱(UV-Vis DRS)、能谱分析(EDS)、X-射线粉末衍射(XRD)对杂化物的组成、结构特征、光致变色性能进行系统研究.2种杂化物均表现出良好的光致变色性，紫外光照射下杂化物1由黄色变为墨绿色，杂化物2由蓝绿色变为灰黑色.暗处室温下保存，变色后的杂化物1稳定，光致变色不可逆，而杂化物2空气中避光4 h 能恢复到原来的颜色，温度升高该逆反应速度加快，无氧条件下该逆反应不发生，即杂化物2在有氧条件下，表现出良好的光致变色可逆性.2种混配物都对光响应速度快，是潜在的光学材料.

Synthesis,Characterization and Photochromism of Inorganic-Organic Hybrid Complexes

Two novel crystalline inorganic-organic hybrid complexes La2K(PMo₁₂O₄₀)(EDTA)4 (1),Ni(PW₁₂O₄₀)(EDTA)₂ (2) have been successfully synthesized by solution method.The compositions，structure characteristics and photochromic properties of complexes have been systematically researched by infrared spectroscopy (IR),thermogravimetric-differential thermal analysis (TG-DTA),cyclic voltammetry (CV),fluorescent spectrum (FL),ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS) energy dispersive spectrometer (EDS)and X-ray power diffraction (XRD).The two hybrid complexes display excellent photochromism：under the ultraviolet light irradiation,the color of hybrid complex 1 quickly shifts from yellow to atrovirens，and complex 2 from blue-green to black-gray.Kept in dark at room temperature，the color-changing hybrid complex 1 is stable,showing irreversible photochromism;while complex 2 returns to its original color just for 4 h in dark place.The reverse reaction of complex 2 can be accelerated by increase in temperature.Without O₂ the reverse reaction of complex 2 will not happened，but in the existence of O₂,complex 2 exhibits excellent reversible photochromism.It can be concluded that the two complexes are all potential optical materials for their fast-responsiveness to light.