Tautomer Selective Photochemistry in 1-(Tetrazol-5-yl)ethanol
作者:A. Ismael、M. L. S. Cristiano、R. Fausto、A. Gómez-Zavaglia
DOI:10.1021/jp109215q
日期:2010.12.23
molecular structure and photochemistry of 1-(tetrazol-5-yl)ethanol [1-TE] was performed. The potential energy surface landscapes of the 1H and 2H tautomers of the compound were investigated and the theoretical results were used to help characterize the conformational mixture existing in equilibrium in the gas phase prior to deposition of the matrices, as well as the conformers trapped in the latter. In the
结合了基质分离FTIR和理论DFT / B3LYP / 6-311 ++ G(d,p)对1-(四唑-5-基)乙醇[1-TE]的分子结构和光化学进行了研究。研究了该化合物的1 H和2 H互变异构体的势能表面态势,并利用理论结果帮助表征了在沉积基质之前气相中处于平衡状态的构象混合物以及被捕获的构象异构体。在后者。在室温下的气相中,该化合物以12种构象异构体的混合物形式存在(5个1 H互变异构体和7个2 H互变异构体互变异构体)。化合物在10 K的氩气基质中沉积后,只有三种主要形式得以保留,因为用于构象异构化的低阻隔层允许在沉积过程中进行广泛的构象冷却。基质在30 K处的沉积导致构象混合物的进一步简化,其中每个1-TE互变异构体仅存在一个构象异构体。这些构象异构体对应于每个互变异构体的最稳定形式,它们带有不同类型的分子内H键:1 H -I具有NH···O氢键,而2 H -I具有OH···N氢键。在用紫外线(λ>
among the three most stable forms are lower than 4 kJ mol −1 . These conformers benefit from stabilising intramolecular hydrogen bonds-like interactions involving the 1 H of the tetrazole ring and the carbonyl oxygen of the saccharyl moiety. The photochemistry of 1-TE-BZT in solidargon was investigated and theoretical DFT/B3LYP/6-311++G(3df,3pd) calculations also helped in assignment of the experimental
摘要 复合基质分离 FTIR 和理论 DFT/B3LYP/6-311++G(3df,3pd) 研究了新型合成的四唑-糖基共轭物 2-[1-(1 H-tetrazol-5-yl)ethyl]-进行了 1,2-benzisothiazol-3(2 H )-one 1,1-dioxide [1-TE-BZT]。在气相中,在室温下,该化合物以六种异构形式(1 H 互变异构体的四种构象异构体和 2 H 互变异构体的两种构象异构体)的混合物形式存在。根据理论计算,构象异构体 1 H 是最稳定的,三种最稳定形式之间的相对能量低于 4 kJ mol -1 。这些构象异构体受益于稳定的分子内氢键样相互作用,涉及四唑环的 1 H 和糖基部分的羰基氧。研究了 1-TE-BZT 在固氩中的光化学和理论 DFT/B3LYP/6-311++G(3df, 3pd) 计算也有助于分配实验波段。在用 λ = 275 nm