Abstract Morpholine is an interesting moiety that used widely in several organic syntheses. The intermolecular charge-transfer (CT) complexity associated between morpholine (Morp) donor with (monoiodobromide “IBr”, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone “DDQ”, 2,6-dichloroquinone-4-chloroimide “DCQ” and 2,6-dibromoquinone-4-chloroimide “DBQ”) π–acceptors have been spectrophotometrically investigated in CHCl3 and/or MeOH solvents. The structures of the intermolecular charge-transfer (CT) were elucidated by spectroscopic methods like, infrared spectroscopy. Also, different analyses techniques such as UV-Vis and elemental analyses were performed to characterize the four morpholine [(Morp)(IBr)], [(Morp)(DDQ)], [(Morp)(DCQ)] and [(Morp)(DBQ)] CT-complexes which reveals that the stoichiometry of the reactions is 1:1. The modified Benesi-Hildebrand equation was utilized to determine the physical spectroscopic parameters such as association constant (K) and the molar extinction coefficient (ε).

中文翻译：

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吗啉供体分子与一些 π 受体的电子转移络合：合成和光谱表征

摘要 吗啉是一个有趣的部分，广泛用于多种有机合成。吗啉（Morp）供体与（单碘溴化物“IBr”、2,3-二氯-5,6-二氰基-1,4-苯醌“DDQ”、2,6-二氯醌- 4-氯酰亚胺“DCQ”和 2,6-二溴醌-4-氯酰亚胺“DBQ”）π-受体已在 CHCl3 和/或 MeOH 溶剂中进行了分光光度法研究。分子间电荷转移（CT）的结构通过光谱方法（如红外光谱）阐明。此外，还进行了不同的分析技术，如 UV-Vis 和元素分析，以表征四种吗啉 [(Morp)(IBr)]、[(Morp)(DDQ)]、[(Morp)(DCQ)] 和 [(Morp) )(DBQ)] CT 络合物显示反应的化学计量比为 1:1。