The crystal structures of diphenyl (cycloheptylamido)phosphate, C19H24NO3P or (C6H5O)2P(O)(NHC7H13), (I), and diphenyl (dibenzylamido)phosphate, C26H24NO3P or (C6H5O)2P(O)[N(CH2C6H5)2], (II), are reported. The NHC7H13 group in (I) provides two significant hydrogen-donor sites in N—H...O and C—H...O hydrogen bonds, needed for a one-dimensional hydrogen-bond pattern along [100] in the crystal, while (II), with a (C6H5CH2)2N moiety, lacks these hydrogen bonds, but its three-dimensional supramolecular structure is mediated by C—H...π interactions. The conformational behaviour of the phenyl rings in (I), (II) and analogous structures from the Cambridge Structural Database (CSD) were studied in terms of flexibility, volume of the other group attached to phosphorus and packing forces. From this study, synclinal (±sc), anticlinal (±ac) and antiperiplanar (±ap) conformations were found to occur. In the structure of (II), there is an intramolecular C
ortho
—H...O interaction that imposes a +sc conformation for the phenyl ring involved. For the structures from the CSD, the +sc and ±ap conformations appear to be mainly imposed by similar C
ortho
—H...O intramolecular interactions. The large contribution of the C...H/H...C contacts (32.3%) in the two-dimensional fingerprint plots of (II) is a result of the C—H...π interactions. The differential scanning calorimetry (DSC) analyses exhibit peak temperatures (T
m) at 109 and 81 °C for (I) and (II), respectively, which agree with the strengths of the intermolecular contacts and the melting points.
报告了二苯基(环庚基氨基)磷酸酯 C19H24NO3P 或 (C6H5O)2P(O)(NHC7H13) (I) 和二苯基(二苄基氨基)磷酸酯 C26H24NO3P 或 (C6H5O)2P(O)[N(CH2C6H5)2] (II) 的晶体结构。(I)中的 NHC7H13 基团在 N-H...O 和 C-H...O 氢键中提供了两个重要的氢供体位点,这是晶体中沿 [100] 形成一维氢键模式所必需的;而 (II) 中的 (C6H5CH2)2N 分子缺乏这些氢键,但其三维超分子结构是由 C-H...π 相互作用介导的。我们从灵活性、与磷相连的另一个基团的体积和堆积力等方面研究了(I)、(II)中苯基环的构象行为以及剑桥结构数据库(CSD)中的类似结构。研究发现,存在同侧(±sc)、反侧(±ac)和反珀尔平面(±ap)构象。在 (II) 的结构中,分子内的 C
正
-H...O相互作用,使相关苯环形成+sc构象。对于来自 CSD 的结构,+sc 和 ±ap 构象似乎主要是由类似的 C
正交
-H...O分子内相互作用。在 (II) 的二维指纹图谱中,C...H/H...C 接触(32.3%)的巨大贡献是 C-H...π 相互作用的结果。差示扫描量热法(DSC)分析表明,(II) 的峰值温度(T
m)分别为 109 ℃ 和 81 ℃,这与分子间接触强度和熔点相吻合。