Crystallographic studies and physicochemical properties of π-electron compounds. XVII. The structure of p-nitrophenylacetic acid

2-Nitrophenylacetic acid: hydrogen-bonded sheets of R 2 2(8) and R 4 4(18) rings

“…In particular, C-HÁ Á Á(arene) hydrogen bonds and aromaticstacking interactions are both absent. The structure of the isomeric 4-nitrophenylacetic acid, (II), was reported some years ago [Cambridge Structural Database (Version of November 2005;Allen, 2002) refcode SEMTAF; Grabowski et al, 1990]. The authors reported the formation of a centrosymmetric hydrogen-bonded dimer, but further aggregation of the dimers was not reported.…”

“…A stereoview of part of the crystal structure of (II), showing the formation of a sheet of -stacked hydrogen-bonded dimers. The original atomic coordinates (Grabowski et al, 1990) have been used. For the sake of clarity, H atoms bonded to C atoms have been omitted.…”

A monoclinic polymorph of 2-(4-nitrophenyl)acetic acid

“…An orthorhombic polymorph of 4-nitrophenylacetic acid was crystallized from ethanol solution and structurally described by Grabowski et al (1990). The new polymorph described herein, (I), features a molecular structure with a nitro group that is essentially coplanar with the aromatic ring [dihedral angle = 3.9 (3) ] and a carboxylic acid group that approaches the perpendicular with respect to the aromatic ring [dihedral angle = 86.9 (3) ], see Fig.…”

Synthesis and structure of phenylbismuth bis(4-nitrophenyl)acetate and diphenylbismuth 2-nitrobenzoate

“…Bismuth atom in the crystal of compound II had a trigonal-bipyramidal coordination with apically located oxygen atoms of 2-nitrobenzoate substituents (Fig 3). [17,18].…”