Synthesis of 1-aroyl-3-methylsulfanyl-5-amino-1,2,4-triazoles and their analysis by spectroscopy, X-ray crystallography and theoretical calculations
作者:Rodolfo Moreno-Fuquen、María Mercedes Hincapié-Otero、Diana Becerra、Juan-Carlos Castillo、Jaime Portilla、Mario A. Macías
DOI:10.1016/j.molstruc.2020.129317
日期:2021.2
The vibrational spectral analysis was carried out using infrared spectroscopy in the range 4000−400 cm−1 for N-aroyl-1,2,4-triazoles TAM and TACl. The experimental spectra were recorded in the solid state. The fundamental vibrational frequencies and intensity of vibrational bands were evaluated using density functional theory (DFT) with the standard B3LYP/6-31G(d,p) method and basis set yielding fairly
摘要 通过 3-氨基-5-甲基硫烷基-1H-1,2,4-三唑与芳酰氯的高效 N-酰化反应,区域选择性地合成了 N-芳酰基-1,2,4-三唑 TAM 和 TACl,收率极佳。通过单晶X射线衍射研究了N-芳酰基-1,2,4-三唑的结构,观察到它们的晶体结构以通过N-H‧‧‧N键形成二聚体为特征。超分子组装取决于二聚体之间的连接类型,随着芳酰基上的对位取代基发生显着变化。直接计算的电离势 (IP)、电子亲和势 (EA)、电负性 (χ)、亲电指数 (ω)、硬度 (η) 和化学势 (μ) 与 HOMO 和 LUMO 轨道能量相关。而且,计算了两种分子的分子静电势图,显示 1,2,4-三唑环的 N2 原子处的负区域而不是环外氨基。使用红外光谱在 4000-400 cm-1 范围内对 N-芳酰基-1,2,4-三唑 TAM 和 TACl 进行振动光谱分析。实验光谱是在固态下记录的。使用密度泛函理论 (DFT)