Crystal Growth and Thin Film Laboratory, School of Physics, Bharathidasan University, Tiruchirappalli 620 024, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Nov;82(1):91-6. doi: 10.1016/j.saa.2011.07.004. Epub 2011 Jul 8.
The organic material 4-chloro-4'-chlorobenzylidene aniline (CCBA) was synthesized and confirmed by NMR and FTIR spectral analyses. CCBA crystal was grown from chloroform by slow evaporation at room temperature and the single crystal cell parameters were determined by single crystal X-ray diffraction method. The perfection of the grown crystal was analyzed by high resolution X-ray diffraction rocking curve analysis. Fluorescence spectrum indicated violet emission at 428 nm. The range of optical absorbance was ascertained by recording UV-vis-NIR spectrum. Load dependant microhardness measurements on this crystal revealed the mechanical behavior of the material. Stiffness constant, Meyer index and yield strength of CCBA crystal were calculated. Dielectric studies were carried out to estimate the dielectric parameters of the grown crystal in the frequency range from 100 Hz to 100 kHz. The thermal behavior of CCBA was investigated using differential scanning calorimetry (DSC) and no phase transition was identified in the temperature region 30-100°C. Further, the CCBA crystal was subjected to open aperture Z-scan studies in order to investigate the third order nonlinear optical (NLO) properties of CCBA crystal.
有机材料 4-氯-4'-氯苯亚甲基苯胺（CCBA）通过 NMR 和 FTIR 光谱分析进行了合成和确认。CCBA 晶体从氯仿中通过室温下的缓慢蒸发生长，并通过单晶 X 射线衍射法确定了单晶胞参数。通过高分辨率 X 射线衍射摇摆曲线分析对生长晶体的完整性进行了分析。荧光光谱表明在 428nm 处发出紫色发射。通过记录 UV-vis-NIR 光谱确定了光学吸收率的范围。对该晶体进行的负载相关显微硬度测量揭示了材料的机械性能。计算了 CCBA 晶体的刚性常数、Meyer 指数和屈服强度。进行了介电研究，以估算在 100Hz 至 100kHz 的频率范围内生长晶体的介电参数。使用差示扫描量热法（DSC）研究了 CCBA 的热行为，在 30-100°C 的温度范围内未发现相变。此外，对 CCBA 晶体进行了开孔径 Z 扫描研究，以研究 CCBA 晶体的三阶非线性光学（NLO）性质。
