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Infrared study of intercomponent interactions in a switchable hydrogen-bonded rotaxane

机译：氢键型轮烷中组分间相互作用的红外研究

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The macrocycle in rotaxane 1 is preferentially hydrogen bonded to the succinamide station in the neutral form, but can be moved to the naphthalimide station by one-electron reduction of the latter. The hydrogen bonding between the amide NH groups of the macrocycle and the C=O groups in the binding stations in the thread was studied with IR spectroscopy in different solvents in both states. In addition, the solvent effect on the vibrational frequencies was analyzed; a correlation with the solvent acceptor number (AN) was observed. The conformational switching upon reduction could be detected by monitoring the hydrogen-bond-induced shifts of the v(CO) frequencies of the C=O groups of the succinamide and the reduced naphthalimide stations. The macrocycle was found to shield the encapsulated station from the solvent: wavenumbers of v(CO) bands of the C=O groups residing inside the macrocycle cavity remain unaffected by the solvent polarity.
机译：轮烷1中的大环优选以氢以中性形式键合至琥珀酰胺站，但是可以通过后者的单电子还原将其转移至萘二甲酰亚胺站。通过红外光谱研究了两种状态下不同溶剂中大环酰胺NH基团与线中键合站中C = O基团之间的氢键。另外，分析了溶剂对振动频率的影响。观察到与溶剂受体数（AN）的相关性。还原时的构象转换可以通过监测琥珀酰胺和还原的萘二甲酰亚胺位的C ＝ O基团的氢键诱导的v（CO）频率的位移来检测。发现大环化合物可将包封的工作站与溶剂隔离开：驻留在大环化合物腔体内的C = O基团的v（CO）带​​的波数不受溶剂极性的影响。

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