title: Hexaaquanickel(II) disulfato(1,4,8,11-tetraazacyclotetradecane)nickelate(II) dihydrate.
abstract: The title compound, [Ni(H(2)O)(6)][Ni(SO(4))(2)(C(10)H(24)N(4))].2H(2)O, is an unusual compound in that it is composed of a hexaaqua complex, formally a dication, and a mixed-donor complex (four N and two O atoms), formally a dianion, with substantial charge separation between the two nickel centres (6.536 A). The homoleptic dication complex consists of the weaker-field ligands, whilst the dianion retains the coordination of all the higher-field donors. Both nickel ions are located at centres of symmetry. This rare compound is placed in the context of previously reported structures which emphasizes its peculiarity.
authors.affiliation: ICM, University of Warsaw, Zwirki i Wigury 93, 02-089 Warszawa, Poland. achurch@icm.edu.pl
authors.forename: Andrew James
authors.initials: AJ
authors.lastname: Churchard
authors.forename: Michał Ksawery
authors.initials: MK
authors.lastname: Cyrański
authors.forename: Wojciech
authors.initials: W
authors.lastname: Grochala