A new polymorph of 2,6-bis(trifluoromethyl)benzoic acid
نویسندگان
چکیده
The asymmetric unit of a second polymorph of the title compound, C(9)H(4)F(6)O(2), contains five independent mol-ecules, which form hydrogen-bonded O-H⋯O dimers about inversion centers. The most significant structural difference between this structure and that of the first polymorph [Tobin & Masuda (2009 ▶). Acta Cryst. E65, o1217] is the hydrogen-bonded, dimeric orientation of the carb-oxy-lic acid functionalities.
منابع مشابه
A new polymorph of 2,6-dimethoxybenzoic acid
A new crystalline form of 2,6-dimeth-oxy-benzoic acid, C(9)H(10)O(4), crystallizing in a tetra-gonal unit cell has been identified during screening for co-crystals. The asymmetric unit comprises a non-planar independent mol-ecule with a synplanar conformation of the carb-oxy group. The sterically bulky o-meth-oxy substituents force the carb-oxy group to be twisted away from the plane of the ben...
متن کاملN 1,N 2-Bis(2,6-dimethylphenyl)-N 1-hydroxyformamidine N,N′-bis(2,6-dimethylphenyl)-N-oxidoformamidinium dichloromethane solvate
The title compound, 2C(17)H(20)N(2)O·CH(2)Cl(2), was obtained by N-oxidation of the parent formamidine with m-chloro-peroxy-benzoic acid (m-CPBA). This is the first use of the above-mentioned synthetic route for the preparation of hydroxy-amidines. The title compound crystallizes as a cyclic dimer resulting from the presence of O-H⋯O and N-H⋯N hydrogen bonds.
متن کاملThe co-crystal N,N′-bis[(pyridin-1-ium-2-yl)methyl]ethanedithioamide bis(2,6-dinitrobenzoate)–2,6-dinitrobenzoic acid (1/4)
The asymmetric unit of title co-crystal, C14H16N4S2 (2+)·2C7H3N2O6 (-)·4C7H4N2O6, comprises a centrosymmetric dipyridinium dication, a 2,6-di-nitro-benzoate anion and two independent 2,6-di-nitro-benzoic acid mol-ecules. The pyridin-ium rings are each approximately perpendicular to the central di-thio-amide unit [dihedral angle = 80.67 (12)°]. The carboxyl-ate/carb-oxy-lic acid groups are appro...
متن کامل2,6-Bis(trifluoromethyl)benzoic acid
The title compound, C(9)H(4)F(6)O(2), contains two mol-ecules in the asymmetric unit, one of which exhibits disorder in both of its trifluoro-methyl groups. The dihedral angles between the benzene ring and the carboxyl group are 71.5 (2) and 99.3 (2)° in the two independent mol-ecules. The compound exhibits a catemeric structure resulting from inter-molecular O-H⋯O hydrogen bonding between the ...
متن کاملA monoclinic polymorph of N,N′-bis(2,6-diisopropylphenyl)formamidine
A new polymorph of N,N'-bis-(2,6-diisopropyl-phen-yl)formamidine, C(25)H(36)N(2), is reported, which is different from the previously reported ortho-rhom-bic structure. The mol-ecule crystallizes in the E-anti configuration, with tautomeric disorder of the N-bonded H atoms and no clear distinction between imine and amine functionalities. The mol-ecules form hydrogen-bonded dimers with inter-mol...
متن کامل