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Spectroscopic characterization of C-4 substituted 3,5-dichloro-4H-1,2,6-thiadiazines

机译:C-4取代的3,5-二氯-4H-1,2,6-噻二嗪的光谱表征

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摘要

Three 3,5-dichloro-4H-1,2,6-thiadiazines, which differ according to the electron withdrawing nature of their substituent at C-4: (a) 3,5-dichloro-4-methylene-4H-1,2,6-thiadiazine (5a), (b) 3,5-dichloro-4H-1,2,6-thiadiazin-4-one (5b) and (c) 2-(3,5-dichloro-4H-1,2,6-thiadiazin-4-ylidene) malononitrile (5c), are characterized using resonance Raman (RR), absorption (UV/vis) and photoluminescence (PL) spectroscopies. These weakly aromatic and electron-deficient heterocycles are potential components as acceptors in donor-acceptor systems for organic electronics. Experimental results, which include the synthesis, characterization and single crystal X-ray structure of 3,5-dichloro-4-methylene-4H-1,2,6-thiadiazine (5a), combined with theoretical calculations of their orbitals and vibrational frequencies, provide an understanding of the optical properties, on the basis of molecular geometry and electron distribution.
机译:三个3,5-二氯-4H-1,2,6-噻二嗪,根据其在C-4处的取代基的吸电子性质而不同:(a)3,5-二氯-4-亚甲基-4H-1, 2,6-噻二嗪(5a),(b)3,5-二氯-4H-1,2,6-噻二嗪-4-酮(5b)和(c)2-(3,5-二氯-4H-1使用共振拉曼光谱(RR),吸收光谱(UV / vis)和光致发光光谱(PL)对1,2,6-噻二嗪-4-亚甲基丙二腈(5c)进行表征。这些弱芳族和缺电子杂环是有机电子供体-受体体系中作为受体的潜在组分。实验结果包括3,5-二氯-4-亚甲基-4H-1,2,6-噻二嗪(5a)的合成,表征和单晶X射线结构,以及它们的轨道和振动频率的理论计算根据分子的几何形状和电子分布,可以了解光学性质。

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