Hydrogen-Bond Interactions of Nicotine and Acetylcholine Salts: A Combined Crystallographic, Spectroscopic, Thermodynamic and Theoretical Study
作者:Virginie Arnaud、Michel Berthelot、Michel Evain、Jérôme Graton、Jean-Yves Le Questel
DOI:10.1002/chem.200600808
日期:2007.2.2
experimental HB basicity of the cations despite its potential multisite HB acceptor properties. The preferred HB interaction site of the ammonium picrate salts was determined from a survey of crystallographic data found in the Cambridge Structural Database (CSD) and is supported by theoretical calculations. Two distinct classes of ammonium groups were characterised depending on the absence (quaternary ammonium)
尼古丁和乙酰胆碱(ACh)的单电荷活性形式的氢键(HB)相互作用已通过使用密度泛函理论(DFT)计算从理论上进行了比较,并在晶体学观察和溶液中平衡常数的测量基础上进行了实验比较。尽管有潜在的多位HB受体特性,但使用2,4,6-三硝基苯酚(苦味酸)抗衡离子确定阳离子的实验HB碱性。根据在剑桥结构数据库(CSD)中发现的晶体学数据确定了优选的苦味酸铵HB相互作用位点,并得到了理论计算的支持。根据是否存在(季铵)或存在(三级,连接两个离子的N(+)HO氢键形成仲和伯铵盐)确定了烟酸烟碱的晶体结构,并将其与ACh进行了比较。该分析揭示了烟碱乙酰胆碱受体(nAChR)配体的铵部分对苦味酸根阴离子的特殊行为。已经开发出专用方法来分离阴离子和阳离子接受位点对溶液中测量的离子对的整体HB碱度的贡献。通过使用几种带有非碱性铵阳离子的模型离子对,在二氯甲烷溶液中测定了与两种不同铵类相关的苦味酸根阴离子的HB碱