Basicity constants for a series of 3,7-diazabicyclo[3.3.1]nonane derivatives in acetonitrile with a variation over 13 orders of magnitude have been determined using a spectrophotometric titration technique. An excellent correlation between basicity and calculated proton affinities obtained at PCM-B3LYP/6-31+G(d)//B3LYP/6-31G(d) level was found. The results are discussed in terms of substituent effects
已使用分光光度滴定技术确定了乙腈中一系列3,7-二氮杂双环[3.3.1]壬烷衍生物的碱性常数,其变化幅度超过13个数量级。发现在PCM-B3LYP / 6-31 + G(d)// B3LYP / 6-31G(d)水平下获得的碱度与计算的质子亲和力之间极好的相关性。根据取代基效应讨论了结果,并将其与15 N NMR化学位移进行了比较。