期刊
CRYSTAL GROWTH & DESIGN
卷 21, 期 10, 页码 5669-5677出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.1c00520
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资金
- Natural Science and Engineering Research Council (NSERC) of Canada [2014-05655]
- Canada Research Chairs program [950-230174]
- Canada Foundation for Innovation (CFI) John R. Evans Leaders Fund (JELF) [32866]
- Ontario Research Fund (ORF) [460548]
- Ontario Graduate Scholarship (OGS) [J5223]
- NSERC Undergraduate Student Research Award (USRA)
- Government of Nova Scotia
The solid-state structure of the neutral thiazyl radical F(2)HbimDTDA is determined by a variety of intermolecular interactions, including pancake bonding and hydrogen bonding. Computational analysis suggests that F(2)HbimDTDA is unlikely to have a morphology similar to its related compound HbimDTDA, with s-hole interactions playing a key role in its packing arrangement.
The solid-state structure of neutral thiazyl radical 4-[2'-(5,6-difluorobenzimidazolyl)]-1,2,3,5-dithiadiazolyl (F(2)HbimDTDA) is the result of a combination of structure-directing intermolecular interactions. Pancake bonding of radical molecules leads to stacks of [F(2)HbimDTDA](2) pairs along [100]. Polarization of the DTDA S atoms creates an area of positive electrostatic potential, forming contacts with electronegative F atoms of a neighboring molecule to define chains along [010]. Importantly, the first observation of H-bonding to DTDA N atoms is reported, with imidazolyl N-H donors. The variety of intermolecular interactions is similar to that observed in the related HbimDTDA, but the resulting solid-state structure of the F2HbimDTDA morphology reported here is quite different. Moreover, computational analysis of the two structures, using a combination of periodic-boundary and finite-molecule calculations, has allowed rationalization of the observed results, indicating that F(2)HbimDTDA is unlikely to occur in a morphology comparable to that reported for HbimDTDA and revealing s-hole interactions as the determining factor in the packing of F(2)HbimDTDA.
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