title: Hydrogen-bonded network in the trichloroacetate salts of 2-amino-5-chloropyridinium and 2-methyl-5-nitroanilinium monohydrate.
abstract: In the crystal structures of 2-amino-5-chloropyridinium trichloroacetate, C(5)H(6)ClN(2)(+).C(2)Cl(3)O(2)(-), (I), and 2-methyl-5-nitroanilinium trichloroacetate monohydrate, C(7)H(9)N(2)O(2)(+).C(2)Cl(3)O(2)(-).H(2)O, (II), the protonated planar 2-amino-5-chloropyridinium [in (I)] and 2-methyl-5-nitroanilinium [in (II)] cations interact with the oppositely charged trichloroacetate anions to form hydrogen-bonded one-dimensional chains in (I) and, together with water molecules, a three-dimensional network in (II). The crystals of (I) exhibit nonlinear optical properties. The second harmonic generation efficiency in relation to potassium dihydrogen phosphate is 0.77. This work demonstrates the usefulness of trichloroacetic acid in crystal engineering for obtaining new materials for nonlinear optics.
authors: Institute of Low Temperatures and Structures Research, Polish Academy of Sciences, PO Box 1410, 50-950 Wrocław, Poland. j.janczak@int.pan.wroc.pl
authors: Jan
authors: J
authors: Janczak
authors: Genivaldo Julio
authors: GJ
authors: Perpétuo
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D011726:Pyridinium Compounds / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D014867:Water
chemical_list: C542995:2-amino-5-chloropyridinium; C542994:2-methyl-5-nitroanilinium monohydrate; D011726:Pyridinium Compounds; D000644:Quaternary Ammonium Compounds; D014867:Water