Soliman Ahmed M M, Abd El Aleem Ali Ali El-Remaily Mahmoud, Kamel Moumen S, El-Araby Alaa, Shokr E Kh
Department of Chemistry, Faculty of Science, Sohag University, Sohag, 82524, Egypt.
Department of Physics, Faculty of Science, Sohag University, Sohag, 82524, Egypt.
Sci Rep. 2025 Jan 10;15(1):1611. doi: 10.1038/s41598-024-83994-0.
Synthesized 3,4-Diaminothieno[2,3-b]thiophene-2,5-dicarbohydrazide (DTT) Schiff base derivatives newly were synthesized by attaching with different aldehydes, deposited in thin film form by thermal evaporation technique, and characterized by UV-Visible-NIR spectroscopy, FT-IR, NMR, and elemental analysis. It is revealed that compound 4 has the highest absorption peak intensity at 586 nm. The allied absorption, dielectric, and dispersion parameters have been calculated and discussed. The obtained results manifested that compound 4 and DTT have lower (1.92 eV), and higher (3.47 eV) energy band gap values, respectively, as a result of the conjugation number effect. The high nonlinear refractive index n and third-order nonlinear susceptibility χ of these organic thin films are comparable with those of chalcogenide and oxide materials, making them promising for nonlinear optical systems. Compound 4 displays high sensitivity towards metal ion detection (ex. Cu, Ni, Fe, Mn, Pb, Co), suggesting its ability to be applied as a metal ion sensor and quantifying their concentration levels by means of a suitable calibration curve.
通过与不同醛类连接新合成了3,4-二氨基噻吩并[2,3-b]噻吩-2,5-二碳酰肼（DTT）席夫碱衍生物，采用热蒸发技术以薄膜形式沉积，并通过紫外-可见-近红外光谱、傅里叶变换红外光谱、核磁共振和元素分析进行表征。结果表明，化合物4在586nm处具有最高的吸收峰强度。已计算并讨论了相关的吸收、介电和色散参数。所得结果表明，由于共轭数效应，化合物4和DTT分别具有较低（1.92eV）和较高（3.47eV）的能带隙值。这些有机薄膜的高非线性折射率n和三阶非线性极化率χ与硫族化物和氧化物材料相当，使其在非线性光学系统中具有应用前景。化合物4对金属离子检测（如铜、镍、铁、锰、铅、钴）显示出高灵敏度，表明其有能力用作金属离子传感器，并通过合适的校准曲线定量其浓度水平。
