The 1:1 Complex Formed by 3-Picoline<i>N</i>-Oxide and<i>p</i>-Toluic Acid

Moreno-Fuquen, Rodolfo; Santos, Regina Helena de Almeida; Gambardella, Maria Teresa do Prado

doi:10.1107/s0108270197007890

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2011

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“…For a report of the unit-cell dimensions and space group of the title compound, see: Ellas & García-Blanco (1963). For comparisons with other hydrogen-bond donors, see: Moreno-Fuquen et al (1997, 2009. For related structures, see: Barcon et al (1997).…”

Section: Related Literaturementioning

confidence: 99%

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Redetermination of 3-methylbenzoic acid

2011

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The asymmetric unit of the title compound, C8H8O2, contains two crystallographically independent molecules, which form dimers linked by O⋯H—O hydrogen bonds. The benzene rings in the dimers are inclined at a dihedral angle of 7.30 (8)° and both methyl groups display rotational disorder. This redetermination results in a crystal structure with significantly higher precision than the original determination [Ellas & García-Blanco (1963 ▶). Acta Cryst. 16, 434], in which the authors reported only the unit-cell parameters and space group, without any detailed information on the atomic arrangement. In the crystal, dimers are connected by weak C—H⋯O interactions, forming R 2 2(10) and R 4 4(18) rings along [110] and an infinite zigzag chain of dimers along the [001] direction also occurs.

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Section: Related Literaturementioning

confidence: 99%

“…The title compound (I) was investigated in a continuation of our studies on the formation of molecular complexes from N-oxide derivatives with different hydrogen bond donors (Moreno-Fuquen et al, 1997, 2009. The structure of a similar molecule was taken to compare with the title molecule (Barcon et al, 1997).…”

Section: S1 Commentmentioning

confidence: 99%