C7H8N4S3) were measured in the spectral range of 3700-100 cm(-1) and 4000-200 cm(-1) with a resolution of 4 and 0.5 cm(-1), respectively. Room temperature 13C NMR and (1)H NMR spectra from room temperature down to -60 °C were also recorded. As a result of internal rotation around C-N and/or C-S bonds, eighteen rotational isomers are suggested for the MAMPC molecule (Cs symmetry). DFT/B3LYP and MP2 calculations
在3700-100 cm(-1)的光谱范围内测量了固体5-甲基-
氨基-4-
氰基-3-(甲
硫基)-1H-
吡唑-1-碳
二硫酸酯(M
AMPC,
C7H8N4S3)的拉曼光谱和红外光谱和4000-200 cm(-1),分辨率分别为4和0.5 cm(-1)。还记录了从室温到-60°C的室温13C NMR和(1)H NMR光谱。由于围绕CN和/或CS键的内部旋转,建议对M
AMPC分子使用18个旋转异构体(Cs对称性)。DFT / B3LYP和MP2的计算最多进行了6-311 ++ G(d,p)基集,以包括极化和扩散函数。结果在固相(实验)和气相(理论上)有利于构象异构体1。对于构象异构体1,两个-
CH3基团指向氮原子(
吡唑环)和CS,-NH2基团保留sp2杂交,C-CN键为准线性。为了支持NMR光谱分配,使用标准不变原子轨道(GIAO)方法预测了B3LYP / 6-311 + G(2d,p)
水平的
化学位