硫脲掺杂马尿酸晶体的结构及性质研究

Investigations on characterization of thiourea-doped hippuric acid crystals

以丙酮/水(体积比为30∶20)为溶剂,采用溶剂挥发法合成了马尿酸单晶以及硫脲掺杂的马尿酸单晶,对未掺杂和硫脲掺杂的马尿酸单晶进行了晶相、光学透过性以及热性质研究。通过元素分析(EA)和粉末X射线衍射(XRD)证实硫脲已掺入到马尿酸晶格中;根据热重分析(TGA)、紫外反射光谱(UV-Vis)和吸湿性实验发现,掺杂后晶体的热降解点变低、熔程变宽、透光性加强、吸湿量减小。实验证明,2种晶体都是综合性能优异的有机非线性光学材料。

Taking acetone/water with a volume ratio of 30∶20 as solvent,hippuric acid crystals and thiourea-doped hippuric acid crystals are synthesized by solvent volatilization method.The crystalline phase,optical transmittance and thermal properties of hippuric acid crystals and thiourea-doped hippuric acid crystals are studied.It is verified through elemental analysis and powder X-ray diffraction that thiourea has incorporated into the crystal lattice of hippuric acid.It is indicated through TGA,UV reflection spectrum and hygroscopic experiments that compared with pure hippuric acid crystals,the doped crystals show lower thermal degradation point,wider melting range,stronger light transmittance and smaller moisture absorption.Two kinds of crystals,whether doped or not,are organic nonlinear optical materials with excellent comprehensive properties.