Structure de l`acide diphénylamino-2-carboxylique

Hydrogen-bonded dimer stacking induced emission of aminobenzoic acid compounds

“…The crystals of 2-(phenylamino)benzoic acid derivatives 1-4 were obtained by vacuum sublimation technique and their structures were characterized by single crystal X-ray diffraction analysis, including compound 1 whose structure has already been reported in literature.z 20 In 1, there are two crystallography independent molecules. Some notable structural features are summarized as follows: (1) the carbonyl group and nitrogen atom are nearly on the same plane due to the intramolecular N-HÁ Á ÁO hydrogen bond.…”

A Facile Synthesis of Substituted 1,4-Benzothiazepin-5(4H)-ones and Pyrido[3,2-f][1,4]thiazepin-5(4H)-ones − Crystal and Molecular Structure of 2-Ethylthio-4-methyl-5(4H)-oxopyrido[3,2-f][1,4]thiazepine-3-carbonitrile

“…The thiazepine ring assumes a boat conformation with approximated mirror symmetry; the mirror plane is defined by S1 atom and the median perpendicular to the C3ϪN1 bond. The April 1997 version of the Cambridge Structural Database [27] was searched for pyrido[3.2-f] [1,4]thiazepines (and other related 1,4-thiazepines, too) but only 5-(4-methyl-piperazinylpyrido[3,2-f] [1,4]benzothiazepine [28] as a compound with a suitable comparative structure was found. Its seven-membered ring conformation is close to that of 3b, the maximum difference of corresponding torsion angles in the two structures is less than 10°.…”

The Na—O bond in sodium fenamate

“…The first of them is the single molecule of fenamic acid. As it is known that in the solid state fenamic acid forms dimers characteristic of benzoic acids (Sbit et al, 1987;Zhou et al, 2009), the fenamic acid dimer (Cambridge Structural Database refcode QQQTBY01; Sbit et al, 1987) has been used as the second reference compound. In the structure of QQQTBY01 the cycle formed by the OHO hydrogen bonds is not symmetrical and for this reason two values for every bond in Table 3 are listed.…”