title: Z and E isomers of butenedioic acid with 2-amino-1,3-thiazole: 2-amino-1,3-thiazolium hydrogen maleate and 2-amino-1,3-thiazolium hydrogen fumarate.
abstract: Maleic acid and fumaric acid, the Z and E isomers of butenedioic acid, form 1:1 adducts with 2-amino-1,3-thiazole, namely 2-amino-1,3-thiazolium hydrogen maleate (2ATHM), C(3)H(5)N(2)S(+) x C(4)H(3)O(4)(-), and 2-amino-1,3-thiazolium hydrogen fumarate (2ATHF), C(3)H(5)N(2)S(+) x C(4)H(3)O(4)(-), respectively. In both compounds, protonation of the ring N atom of the 2-amino-1,3-thiazole and deprotonation of one of the carboxyl groups are observed. The asymmetric unit of 2ATHF contains three independent ion pairs. The hydrogen maleate ion of 2ATHM shows a short intramolecular O-H...O hydrogen bond with an O...O distance of 2.4663 (19) A. An extensive hydrogen-bonded network is observed in both compounds, involving N-H...O and O-H...O hydrogen bonds. 2ATHM forms two-dimensional sheets parallel to the ab plane, extending as independent parallel sheets along the c axis, whereas 2ATHF forms two-dimensional zigzag layers parallel to the bc plane, extending as independent parallel layers along the a axis.
authors.affiliation: Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, Tamil Nadu, India.
authors.forename: Jain
authors.initials: J
authors.lastname: John
authors.forename: T
authors.initials: T
authors.lastname: Balasubramanian
mesh_terms: D020148:Butyric Acid / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005650:Fumarates / Q000737:chemistry*; D006860:Hydrogen Bonding; D007536:Isomerism; D008298:Maleates / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D013844:Thiazoles / Q000737:chemistry*
chemical_list: D005650:Fumarates; D008298:Maleates; D013844:Thiazoles; D020148:Butyric Acid; C004483:2-aminothiazole; C032005:fumaric acid; C030272:maleic acid