Angular ring distortions in benzene derivatives: the effect of the NO₂and COOH substituents

A redetermination of 2-nitrobenzoic acid

“…1). The pattern of bond lengths and bond angles is consistent with those reported in previous structural investigations concerning the effect of the nitro and the carboxy groups on the geometry of polysubstituted benzene rings (Colapietro et al, 1984;Domenicano et al, 1989). Analysis of the crystal packing of (I), (Fig.…”

“…For the previous structure determination, see: Kurahashi et al (1967); Sakore et al (1967); Tavale & Pant (1973). For the effect of nitro and carboxy substitution on the geometry of polysubstituted benzene rings, see: Colapietro et al (1984); Domenicano et al (1989). For the formation of hydrogenbonded dimers in monocarboylic acids, see: Leiserowitz (1976).…”

Interplane Distances Modulation in Lanthanide-Based Coordination Polymers

“…The torsion angles of the three independent carboxylate groups (defined as the angle between the aromatic plane and the carboxylate plane) are roughly 6.37°, 9.52°, and 20.36° and very similar to the ones of the terbium compound already reported (6.99°, 11.06°, and 27.95°) − No crystallization water molecule has been found, and the view shown in Figure explains this fact. The channels created along the c⃗ axis are not large enough to allow the insertion of free water molecules.…”

“…33 Note however that the anion is less planar than the neutral carboxylic acid. [45][46][47] No crystallization water molecule has been found, and the view shown in Figure 2 explains this fact. The channels created along the c b axis are not large enough to allow the insertion of free water molecules.…”

Structure of benzenepentacarboxylic acid

“…As far as we know, the structures of nine of the twelve benzenecarboxylic acids have been determined by X-rays. Thus the structures of benzoic acid (Sim, Robertson & Goodwin, 1955;Bruno & Randaccio, 1980;Feld, Lehmann, Muir & Speakman, 1981), 1,2-benzenedicarboxylic acid (Nowacki & Jaggi, 1957;Kiippers, 1981;Ermer, 1981), 1,3-benzenedicarboxylic acid (Alcal~t & Martinez-Carrera, 1972;Derissen, 1974), 1,4benzenedicarboxylic acid (Bailey & Brown, 1967;Colapietro, Domenicano, Marciante & Portalone, 1984), 1,2,3-benzenetricarboxylic acid (Fornies-Marquina, Courseille, Busetta & Hospital, 1972;Mo & Adman, 1975), 1,2,4-benzenetricarboxylic acid (Takusagawa, Hirotsu & Shimada, 1973), 1,3,5-benzenetricarboxylic acid (Duchamp & Marsh, 1969;Herbstein & Marsh, 1977;Herbstein & Kapon, 1978), 1,2,4,5benzenetetracarboxylic acid (Takusagawa, Hirotsu & Shimada, 1971) and mellitic acid (Darlow, 1961) have been reported. The corresponding structures of 1,2,3,5-benzenetetracarboxylic, 1,2,3,4-benzenetetracarboxylic and benzenepentacarboxylic acids have not been determined by X-rays.…”