Low-temperature study of the molecular and crystal structures of 2-(2′-tosylamino-5′-nitrophenyl)-4H-3,1-benzoxazin-4-one, an organic luminophore View Full Text


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Article Info

DATE

2001-03

AUTHORS

A. N. Utenyshev, O. S. Filipenko, B. M. Bolotin, V. I. Ponomarev

ABSTRACT

The crystal structure of 2-(2′-tosylamino-5′-nitrophenyl)-4H-3,1-benzoxazin-4-one (I) is studied by X-ray diffraction at 100 K (C21H15N3O6S, a = 20.899(2) Å, b = 10.948(1) Å, c = 8.260(1) Å, V = 1889.3(1) Å3, Z = 4, and space group Pbn21). The compound exhibits an anomalous Stokes shift. Upon cooling, the oxazineaminophenyl fragment of compound I acquires a quinoid structure and the linear parameters of the intramolecular N-H⋯N hydrogen bond increase (the distance between the heterocyclic nitrogen atom and the hydrogen atom of the tosylamino group becomes 1.92 Å). The complete optimization of the geometry of molecules in compound I and unsubstituted 2-(2′-tosylaminophenyl)-4H-3,1-benzoxazin-4-one in the ground singlet electronic state is performed by the semiempirical method with the MOPAC program. It is shown that the oxygen atoms in the sulfo group of molecule I are nonequivalent, because one of them is involved in the intermolecular C-H⋯O hydrogen bond. More... »

PAGES

225-229

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/1.1358398

DOI

http://dx.doi.org/10.1134/1.1358398

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004865287


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