title: catena-Poly[diaquabis(5-chloropyridinium-2-olato-kappaO)copper(II)]-mu-pyrazine-kappa2N:N'] diperchlorate].
abstract: In the title compound, [Cu(C(5)H(4)ClNO)(2)(C(4)H(4)N(2))(H(2)O)(2)](ClO(4))(2), the Cu atom, which lies on an inversion centre, has an octahedral environment. The pyrazine ligand also lies about an inversion centre and links adjacent Cu atoms into a chain running along the b axis; perchlorate anions occupy the space between the chains, and the chains use the coordinated water molecules to link to the anions, resulting in a hydrogen-bonded ribbon structure. The donor 5-chloro-2-hydroxypyridine ligand exists in the zwitterionic form, i.e. 5-chloropyridinium-2-olate.
authors.affiliation: Department of Chemistry, Wenzhou Normal College, Wenzhou 325027, People's Republic of China. hu1964615@263.net
authors.forename: Ji-Xin
authors.initials: JX
authors.lastname: Yuan
authors.forename: Mao-Lin
authors.initials: ML
authors.lastname: Hu
authors.forename: Ya-Qian
authors.initials: YQ
authors.lastname: Cheng
authors.forename: Li-Chun
authors.initials: LC
authors.lastname: Chen
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng