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- Title
New ε-Polymorphic Modification of 4-Nitrophenyl-Substituted Nitronylnitroxyl.
- Authors
Fedyanin, I. V.; Samigullina, A. I.; Tretyakov, E. V.
- Abstract
A new ε-polymorph of 4,4,5,5-tetramethyl-2-(4-nitrophenyl)-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl is prepared and characterized by single-crystal XRD. The arrays of XRD data have been accumulated and the structures of known α–γ-polymorphs of this paramagnetic are solved under the same conditions. The Hirshfeld surfaces of the crystal structures of the studied polymorphs are analyzed qualitatively and quantitatively. It is shown that the known α–δ-polymorphs contain a supramolecular associate in the form of a centrosymmetric dimer whose molecules are connected by C–H⋯O hydrogen bonds. At the same time, only the ε-polymorph contains π-bonded infinite stacks of nitrophenyl substituents, which in turn determine the formation of short distances between oxygen atoms of nitroxide groups (3.508(2) Å and 3.627(2) Å).
- Subjects
X-ray diffraction; CRYSTAL surfaces; HYDROGEN bonding; SURFACE structure; CRYSTAL structure; NITROXIDES
- Publication
Journal of Structural Chemistry, 2024, Vol 65, Issue 3, p619
- ISSN
0022-4766
- Publication type
Article
- DOI
10.1134/S0022476624030168