Polymorphism, Weak Interactions and Phase Transitions in Chalcogen-Phosphorus Heterocycles.

Polymorphism, Weak Interactions and Phase Transitions in Chalcogen-Phosphorus Heterocycles.
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DOI:
10.1002/chem.201800978
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发表时间:
2018-08-01
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Ashbrook SE
Ashbrook SE
中科院分区:
其他
文献类型:
--
作者:
Camacho PS;Stanford MW;McKay D;Dawson DM;Athukorala Arachchige KS;Cordes DB;Slawin AMZ;Woollins JD;Ashbrook SE

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合成了一系列具有芳香骨架的含P−E杂环化合物(E=chalcogen),并通过单晶、粉末XRD、微量分析和质谱分析对其进行了表征。溶液和固态31P和77Se核磁共振谱显示了溶液和固态核磁共振参数之间的显著差异,这与分子的构象变化有关。许多化合物显示出许多不同的多晶结构(通过单晶XRD识别),尽管固体核磁共振光谱研究的大块材料通常只包含一种主要的多晶结构。对于未氧化的杂环,也通过DFT计算研究了弱分子间J偶联的存在。
A series of P−E‐containing heterocycles (E=chalcogen) with aromatic backbones were synthesised and characterised by single‐crystal and powder XRD, microanalysis and mass spectrometry. Solution‐ and solid‐state 31P and 77Se NMR spectroscopy revealed significant differences between the NMR parameters in solution and in the solid state, related to conformational changes in the molecules. Many compounds were shown to exhibit a number of different polymorphic structures (identified by single‐crystal XRD), although the bulk material studied by solid‐state NMR spectroscopy often contained just one major polymorph. For the unoxidised heterocycles, the presence of weak intermolecular J couplings was also investigated by DFT calculations.
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