conformation of the COO·HOH species. The O(3W)···O hydrogen bond in the optimised half of a dimer structures is shorter in comparison with that in the crystal. In optimised structures of dimer the hydrogen bond lengths vary with the applied method and they are longer than those in the crystal. The O(3W)···O distances in dimer calculated by the B3LYP/6-31G(d,p) method are comparable (2.868 and 2.854 A) but in
摘要 通过 X 射线衍射、MP2 和 B3LYP 计算、FT-IR、拉曼、1H 和 13C NMR 光谱研究了 1-
甲基吡啶鎓-4-
羧酸盐一
水合物的结构。晶体为三斜晶系,空间群 Pī,a = 6.747(1), b = 7.6164(8), c = 7.709(1) A, α = 72.30(1)°, β = 72.26(2)°, γ = 89.81(1)°,V = 357.7(1) A3,Z = 2。两个 1-methylpyridinium-4-carboxylate 一
水合物分子通过晶体对称中心相关联,由一对
水分子通过两个 O 连接成二聚体(3W)–H...O 氢键长度为 2.786(2) 和 2.957(1) A. 计算的分子几何与 X 射线数据非常吻合,除了 COO·HOH 物种的构象。与晶体中的氢键相比,优化的二聚体结构的一半中的O(3W)...O氢键较短。在二聚体的优化结构中