title: Diaqua-bis[1-hydroxy-2-(imidazol-3-ium-1-yl)-1,1'-ethyl-idenediphophonato-κO,O']zinc(II).
abstract: In the title complex, [Zn(C(5)H(9)NO(7)P(2))(2)(H(2)O)(2)], the zinc atom is coordinated by two bidentate zoledronate [zoledronate = (2-(1-imidazole)-1-hydr-oxy-1,1'-ethyl-idenediphophonate)] ligands and two water mol-ecules. The coordination number is 6. There is one half-mol-ecule in the asymmetric unit with the zinc atom located on a crystallographic inversion centre. The anion exists as a zwitterion with an overall charge of -1; the protonated nitro-gen in the ring has a positive charge and the two phospho-nates groups each have a single negative charge. There are two intra-molecular O-H⋯O hydrogen bonds. The mol-ecules are linked into a chain by inter-molecular O-H⋯O hydrogen bonds. Adjacent chains are further linked by O-H⋯O hydrogen bonds involving the aqua ligands. An N-H⋯O inter-action is also observed.
authors.affiliation: Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica and, Escuela de Ciencia y Tecnología, Universidad Nacional General San Martín, Buenos Aires, Argentina.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Freire
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Vega