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Equivalence of Ethylene and Azo-Bridges in the Modular Design of Molecular Complexes: Role of Weak Interactions

机译:分子配合物模块设计中的乙烯和偶氮桥的当量:弱相互作用的作用

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摘要

Structural equivalence is a general tool applied in crystal engineering for the predictable construction of molecular assemblies. In the present contribution we analyzed the equivalence of azo (-N=N-) and ethylene (-C=C-) bridges in the modular design of organic assemblies by studying 22 molecular complexes of 4,4'-azopyridine and 1,2-bis(4-pyridyl)ethene, of which 12 are novel. Unit cell similarity index (II), as a numerical descriptor, was used to rationalize the observed equivalence/ variance in the crystal packing of related complexes. A combined structural chemistry, database analysis and computational methods unveil the fact that the identity of the primary synthons alone does not ensure isostructurality; instead a concurrent effect of the contributions from both strong and weak/dispersive forces determines the structural equivalence. A statistical analysis based on a Cambridge Structural Database survey features an apparent inverse correlation that exist between N center dot center dot center dot I and I I bond distances; a group of data points, however, deviate from this linear relation and was accounted on the basis of electrostatic potential distribution and interaction types.
机译:结构等效性是晶体工程中用于预测分子组装的通用工具。在本论文中,我们通过研究22种4,4'-偶氮吡啶和1,2的分子配合物,分析了有机组装模块设计中偶氮(-N = N-)和乙烯(-C = C-)桥的等效性-双(4-吡啶基)乙烯,其中12个是新颖的。作为数值描述符的单位晶胞相似性指数(II)用于合理化相关配合物晶体堆积中观察到的当量/方差。结构化学,数据库分析和计算方法的结合揭示了这样一个事实,即仅主要合成子的身份不能确保同构性。相反,强和弱/分散力共同作用的结果决定了结构的等效性。基于剑桥结构数据库调查的统计分析的特征在于,N个中心点,中心点中心点I和I I键距之间存在明显的反相关关系。但是,一组数据点偏离了此线性关系,并根据静电势分布和相互作用类型进行了计算。

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