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首页> 外文期刊>Crystal growth & design >The first phenyl- N -pyridinylcarbamate structures: Structural and conformational analysis of nine methoxyphenyl- N -pyridinylcarbamates
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The first phenyl- N -pyridinylcarbamate structures: Structural and conformational analysis of nine methoxyphenyl- N -pyridinylcarbamates

机译:第一个苯基-N-吡啶基氨基甲酸酯结构:九种甲氧基苯基-N-吡啶基氨基甲酸酯的结构和构象分析

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摘要

A 3 × 3 isomer grid of nine methoxyphenyl-N-pyridinylcarbamates (C_(13)H_(12)N_2O_3) as CxxOMe (x = para-/meta-/ortho-) represents the first phenyl-N-pyridinylcarbamate crystal structures to be reported. Structural relationships have been correlated in all nine crystal structures as derived from ab initio calculations and the solid-state using conformational analysis. N-H?N hydrogen bonds dominate as the primary interaction in all nine isomers. Two isomers (CmmOMe, CmoOMe) form unusual cyclic N-H?N trimer synthons as R~3 _3(15) with two distinct conformations isolated in the CmoOMe structure, whereas the three CoxOMe isomers form N-H?N hydrogen bonded dimers based on the R~2 _2(8) motif. For all isomers, C-H?O interactions assist in aggregation, and in most cases the methoxy group augments the hydrogen bonding. The solid state and modeled conformations are mismatched in three isomers where the methoxy groups and meta-methoxyphenyl rings (mOMe) (in the solid state) adopt metastable or unstable conformations compared to their optimized computational models. This is rationalized in terms of preferred solid state conformations and observed interactions as compared to the computational models.
机译:九个甲氧基苯基-N-吡啶基氨基甲酸酯(C_(13)H_(12)N_2O_3)作为CxxOMe(x =对-/间-/邻-)的3×3异构体网格表示第一个苯基-N-吡啶基氨基甲酸酯晶体结构为报告。从头算和使用构象分析得出的固态,所有九种晶体结构的结构关系都已相关。在所有九种异构体中,N-HHN氢键占主导地位。两个异构体(CmmOMe,CmoOMe)形成不寻常的环状NH?N三聚体,如R〜3 _3(15),在CmoOMe结构中分离出两个不同的构象,而三个CoxOMe异构体则基于R〜形成氢氮键2 _2(8)主题。对于所有异构体,C-H2O相互作用有助于聚集,并且在大多数情况下,甲氧基会增加氢键。固态和建模构象在三个异构体中不匹配,其中与优化的计算模型相比,甲氧基和间甲氧基苯环(mOMe)(处于固态)采用亚稳态或不稳定构象。与计算模型相比,这在优选的固态构型和观察到的相互作用方面是合理的。

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