Tautomeric equilibria of 2- and 4-thiouracil in gas phase and in solvent: A density functional study
作者:T. Marino、N. Russo、E. Sicilia、M. Toscano
DOI:10.1002/1097-461x(2001)82:1<44::aid-qua1020>3.0.co;2-6
日期:——
self-consistent reaction field approach by the polarizable continuum model. All calculations indicate that the most stable tautomer for both species, in the gas phase as well as in solution, has the oxo-thione form, in full agreement with the previous ab initio and experimental studies. The tautomeric stability orders obtained in the aqueous solution are sensibly different from that in the gas phase. At B3LYP/6-311++G(d
气相和水溶液中 2- 和 4-硫尿嘧啶的五种有利互变异构体的相对稳定性通过密度泛函理论采用 Becke、Lee、Yang 和 Parr (B3LYP) 交换相关势和三个 6- 31G(d,p)、6-311++G(d,p) 和三 zeta 价 (TZVP) 基组。还计算了零点振动校正。通过可极化连续介质模型在自洽反应场方法的框架内研究了本体溶剂效应。所有计算表明,两种物质在气相和溶液中最稳定的互变异构体都具有氧代硫酮形式,这与之前的从头计算和实验研究完全一致。在水溶液中获得的互变异构稳定性顺序明显不同于在气相中的互变异构稳定性顺序。在 B3LYP/6-311++G(d, p) 在气相中,2-和 4-硫尿嘧啶互变异构体的稳定性顺序分别为:S2U1>S2U2>S2U4>S2U5>S2U3 和 S4U1>S4U2>S4U3>S4U4>S4U5。水相中相应的趋势是S2U1>S2U3>S2U2>S2U