Charge-transfer interactions between piperidine as donor with different σ- and π-acceptors: Synthesis and spectroscopic characterization

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• 作者：Moamen S. Refat ; Hamdy Al. Didamony ; Khlood M. Abou El-Nour ; Lamia El-Zayat ; Abdel Majid A. Adam
• 关键词：Benesi– ; Hildebrand ; Charge transfer ; DDQ ; DCQ ; DDQ ; Piperidine and infrared spectra
• 刊名：Arabian Journal of Chemistry
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：4
• 期：1
• 页码：105-114
• 全文大小：935 K

文摘

Charge-transfer (CT) complexes formed between piperidine (Pip) as 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), as acceptors have been studied spectrophotometrically. The synthesis and characterization of piperidine CT-complexes of monoiodobromide, [(Pip)(IBr)], 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, [(Pip)(DDQ)], 2,6-dichloroquinone-4-chloroimide, [(Pip)(DCQ)] and 2,6-dibromoquinone-4-chloroimide, [(Pip)(DBQ)] were described. These complexes are readily prepared from the reaction of Pip with IBr, DDQ, DCQ and DBQ within CHCl₃ solvent. IR, UV–Vis techniques and elemental analyses (CHN), characterize the four piperidine charge-transfer complexes. Benesi–Hildebrand and its modification methods were applied to the determination of association constant (K), molar extinction coefficient (ε).