title: Crystal structure of the 1:2:2 adduct of piperazine, o-phthalic acid and water.
abstract: The adduct of piperazine, o-phthalic acid and water (1:2:2), C20H26N2O10, crystallizes in the monoclinic space group P21/c with a = 6.129(1), b = 12.810(2), c = 13.137(2)A, beta = 95.87(1) degrees, V = 1026.0(3)A3, Z = 2. The piperazinium adopts a chair comformer, and is tied with the hydrogen orthophthalate via a hydrogen bond of the N-H...O type. Because of bifurcated hydrogen bonding of C(sp3)H-O [3.0801(17) and 3.1408(18)A] and the shortest hydrogen bond of C(sp3)H-O [2.9758(17)A], C(sp3)H-O hydrogen bonds play important roles in stablizing the title adduct.
authors.affiliation: College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China. Zhimin-j@163.net
authors.forename: Zhi Min
authors.initials: ZM
authors.lastname: Jin
authors.forename: Yuan Jiang
authors.initials: YJ
authors.lastname: Pan
authors.forename: Ling
authors.initials: L
authors.lastname: He
authors.forename: Zu Guang
authors.initials: ZG
authors.lastname: Li
authors.forename: Kai Bei
authors.initials: KB
authors.lastname: Yu