In the crystal structure of the title compound, 2C(6)H(4)N(2)·C(6)H(2)Cl(2)O(4)·2C(2)H(3)N, the two symmetry-related pyridine-3-carbonitrile mol-ecules are linked to either side of a chloranilic acid (systematic name: 2,5-dichloro-3,6-dihydr-oxy-1,4-benzoquinone) mol-ecule via inter-molecular O-H⋯N hydrogen bonds, giving a centrosymmetric 2:1 unit. The dihedral angle between the pyridine ring a...

The crystal structures of the 1:2 compounds of chloranilic acid (systematic name: 2,5-di-chloro-3,6-dihy-droxy-1,4-benzo-quinone) with 2-pyridone, 3-hy-droxy-pyridine and 4-hyroxypyridine, namely, bis-(2-pyridone) chloranilic acid, 2C5H5NO·C6H2Cl2O4, (I), bis-(3-hy-droxy-pyridinium) chloranilate, 2C5H6NO+·C6Cl2O42-, (II), and bis-(4-hy-droxy-pyridinium) chloranilate, 2C5H6NO+·C6Cl2O42-, (III), ...

In dioxan-chloroform medium the acceptor chloranilic acid forms 1:1 molecular complexes with the alkaloids atropine, pilocarpine and strychnine, with maximum absorption at 535, 527.5 and 535 nm respectively. Conformity with Beer's law allows the use of the complexes for the assay of these drugs.

The title salt, 2C(16)H(15)F(3)N(3)OS(+)·C(6)Cl(2)O(4) (2-), is composed of two independent cations of a lansoprazole {systematic name 2-([3-methyl-4-(2,2,2-trifluoroethoxy)pyridin-2-yl]methylsulfinyl)-1H-benzo[d]imidazole} inter-mediate and a dianion of chloranilic acid. In the cations of the lansoprazole inter-mediate, the dihedral angles between the least-squares planes of the pyridine and b...

A rapid, sensitive and accurate spectrophotometric method for the determination of ambroxol was described in this study. The current method was developed based on charge transfer complexation of ambroxolol (AMB) with the chloranilic acid (CAA). The formed intensed Colored complex was measured at 430 nm and used for determination of AMB and its formulations.Under optimized experimental condition...

The crystal structure of chloranilic acid, C(6)H(2)Cl(2)O(4), was first described by Andersen in 1967 [Andersen, E. K. (1967). Acta Cryst. 22, 188-191] at room temperature using visually estimated intensities. Taking into account the importance of the title compound, we have redetermined the structure at 100 (1) K. The approximately planar mol-ecule [the maximum deviation from the mean plane th...

The crystal structure of four lutidinium chloranilates, (CH3)2C6H3NH + C6HO4Cl2 , was determined by single crystal X-ray diffraction at room temperature. 2,4-lutidinium chloranilate (I): triclinic, P1̄ (#2), Z = 2, a = 11.401(2), b = 11.639(2), c = 5.1588(8) Å, = 91.899(15) , = 90.104(14) , and = 83.355(16) , 2,5-lutidinium chloranilate (II): monoclinic, P21/c (#14), Z = 4, a = 7.709(2), b = 11....