Extension of the Self-Consistent Spectrophotometric Basicity Scale in Acetonitrile to a Full Span of 28 p<i>K</i><sub>a</sub> Units: Unification of Different Basicity Scales
作者:Ivari Kaljurand、Agnes Kütt、Lilli Sooväli、Toomas Rodima、Vahur Mäemets、Ivo Leito、Ilmar A. Koppel
DOI:10.1021/jo048252w
日期:2005.2.1
self-consistent spectrophotometric basicity scale in acetonitrile (AN) was expanded to range from 3.8 to 32.0 pKa units, that is 28 orders of magnitude. Altogether 54 new relative basicity measurements (ΔpKa measurements) were carried out and 37 new compounds were introduced to the scale (it now includes altogether 89 bases). The relative basicity of any two bases in the scale can be obtained by combining
先前在乙腈(AN)中编写的自洽分光光度碱度标度范围扩大到3.8至32.0 p K a单位,即28个数量级。共54个新相对碱性的测量(ΔP ķ一个测量)进行了并引入37个新的化合物的比例(它现在包括一共89个碱基)。量表中任何两个基准的相对碱性可以通过组合至少两组独立的测量值来获得。多次重叠的测量使结果更可靠。测量的整体一致性(如前所述)为s = 0.03 p K a单位。我们所有的实验数据的深入分析(ΔP ķ一个的这个和早期作品)和实验的p值ķ一个数据AN在文献中获得(从库切和帕德马纳班,Kolthoff和Chantooni,Jr。的所述Schwesinger基,布伦”等和其他一些人的组工程,共进行了19篇论文)。在该分析的基础上,将标度吡啶的锚定点向上移动0.20 p K a单位,从而也可以修正标度上所有碱基的绝对p K a值。这样,我们的相对数据与绝对p K a之间的一致性很好获得了上