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:
影响因子:
--
通讯作者:
Ashbrook SE
中科院分区:
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
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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