title: Aquabis[1-hydroxy-2-(imidazol-3-ium-1-yl)-1,1'-ethylidenediphophonato-κO,O']zinc(II) dihydrate.
abstract: In the title complex, [Zn(C(5)H(9)NO(7)P(2))(2)(H(2)O)]·2H(2)O, the zinc atom is coordinated by two zoledronate anions [zoledronate = (2-(1-imidazole)-1-hydr-oxy-1,1'-ethyl-idenediphophonate)] and one water mol-ecule. The coordination number is 5. There is one half-mol-ecule in the asymmetric unit, the zinc atom being located on a twofold rotation axis passing through the metal centre and the coordinating water O atom. 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. Inter-molecular O-H⋯O hydrogen bonds link the mol-ecules. An N-H⋯O inter-action is also present.
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