1,5-Type nonbonded O⋯S and S⋯S interactions in (acylimino) and (thioacylimino)benzothiazoline systems. Crystal structures and theoretical calculations
摘要:
Intramolecular nonbonded interactions have been observed in the crystalline structures of 6-ethoxy-2-trifluoroacetylimino-benzothiazoline (4) ((SO)-O-... close contact) and 6-ethoxy-2-trifluorothioacetyliminobenzothiazoline (5) ((SS)-S-... close contact). Density functional B3LYP/6-311G** calculations were performed for all conformers and tautomers of 4 and 5 in order to explain the preference for the (SO)-O-... and (SS)-S-... close contact structures. The calculations agree with the observed crystallographic structures only when solvent effects are included via a continuum model, thus showing the importance of the solvent effects to establish the correct relative energies. (C) 2003 Elsevier Ltd. All rights reserved.