Structure and Stability of Small Nitrile Sulfides and Their Attempted Generation from 1,2,5-Thiadiazoles
作者:Tibor Pasinszki、Tamás Kárpáti、Nicholas P. C. Westwood
DOI:10.1021/jp010830e
日期:2001.6.1
and spectroscopic identification of nitrile sulfides by thermolysis of 1,2,5-thiadiazole precursors was attempted, but in all cases the thiadiazoles were found to produce sulfur and the corresponding nitrile. This prompted an investigation by ab initio and density functional calculations for the equilibrium geometries, stabilities, and decomposition mechanisms of several nitrile sulfides (XCNS, where
尝试通过 1,2,5-噻二唑前体的热解来气相生成和光谱鉴定腈硫化物,但在所有情况下发现噻二唑会产生硫和相应的腈。这促使对几种腈硫化物(XCNS,其中 X = H、F、Cl、CN、CH3)的平衡几何形状、稳定性和分解机制进行从头算和密度泛函计算研究。从 B3LYP、MPn(n = 2−4)、QCISD、QCISD(T)、CCSD 和 CCSD(T) 水平的计算中获得的平衡几何形状具有中等到大的基组,表明分子具有线性重原子几何形状。氟衍生物是个例外,它的弯曲计算得到的线性障碍为 889 cm-1 (B3LYP/cc-pVTZ)。B3LYP 方法预测腈硫化物在稀气相中是稳定的,而在凝聚相中,由于双分子分解,它们被认为是非常不稳定的。这种损失过程的机制...