Conformers of Allyl Isothiocyanate: A Combined Microwave Spectroscopy and Computational Study

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dc.contributor.authorStitsky, Joseph
dc.contributor.authorSilva, Weslley G. D. P.
dc.contributor.authorSun, Wenhao
dc.contributor.authorvan Wijngaarden, Jennifer
dc.date.accessioned2021-10-13T15:57:58Z
dc.date.available2021-10-13T15:57:58Z
dc.date.issued2020-04-21
dc.date.submitted2021-10-12T22:07:43Zen_US
dc.description.abstractThe pure rotational spectrum of allyl isothiocyanate (CH2=CHCH2-NCS) was collected from 4-26 GHz using Fourier transform microwave (FTMW) spectroscopy. Its analysis revealed the presence of two conformers that arise due to variation in the CCCN and CCNC dihedral angles. The observed spectrum is consistent with the accompanying potential energy surfaces derived using quantum chemical calculations at the B3LYP-D3(BJ) and MP2 levels of theory. Together, this experimental and theoretical study unequivocally identifies a new conformer (I) as the global minimum geometry. The spectral assignment of this new conformer is verified by the observation of transitions consistent with its 34S, 13C and 15N isotopologues and with the characteristic 14N quadrupole hyperfine patterns. For conformer I, the substitution (rs) and effective ground state (r0) structures were derived and reveal contributions from a large amplitude motion in the CCNC angle. The remaining geometric parameters compare well with the equilibrium structure (re) from B3LYP-D3(BJ)/cc-pVQZ calculations. The derived CNC bond angle of 152.6(3)o for conformer I of allyl-NCS is found to be ~15o larger than that of allyl-NCO (137.5(4)o), which is in line with a change in the hybridization at nitrogen from an orbital with more ~sp character in allyl-NCS to ~sp1.5 in allyl-NCO as determined via natural bond orbital analyses.en_US
dc.description.sponsorshipNSERC RGPIN/0653-2016en_US
dc.identifier.citationStitsky, J.; Silva, W. G. D. P.; Sun, W.; van Wijngaarden, J. Conformers of Allyl Isothiocyanate: A Combined Microwave Spectroscopy and Computational Study. J. Phys. Chem. A 2020, 124, 19, 3876–3885en_US
dc.identifier.doi10.1021/acs.jpca.0c02059
dc.identifier.urihttp://hdl.handle.net/1993/36040
dc.language.isoengen_US
dc.publisherThe Journal of Physical Chemistry Aen_US
dc.rightsopen accessen_US
dc.subjectmicrowave spectroscopyen_US
dc.subjectquantum chemistry calculationsen_US
dc.subjectisothiocyanatesen_US
dc.subjectstructure determinationen_US
dc.titleConformers of Allyl Isothiocyanate: A Combined Microwave Spectroscopy and Computational Studyen_US
dc.typePreprinten_US
local.author.affiliationFaculty of Scienceen_US
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