title: Piperazine-1,4-diium bis-(hexa-hydroxido-hepta-oxidohexa-borato-κ(3) O,O',O'')cobaltate(II) hexa-hydrate.
abstract: In the title hydrate, (C4H12N2)[Co{B6O7(OH)6}2]·6H2O, both the dication and dianion are generated by crystallographic inversion symmetry. The Co(2+) ion in the dianion adopts a fairly regular CoO6 octa-hedral coordination geometry arising from the two O,O',O''-tridentate ligands. In the crystal, the dianions and water mol-ecules are linked by O-H⋯O hydrogen bonds, generating a framework with large [100] channels, which are occupied by the organic dications. N-H⋯O and C-H⋯O hydrogen bonds consolidate the structure.
authors.affiliation: Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna Bizerte, Tunisia.
authors.forename: Nabil
authors.initials: N
authors.lastname: Jamai
authors.affiliation: Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna Bizerte, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Rzaigui
authors.affiliation: Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna Bizerte, Tunisia.
authors.forename: Samah Akriche
authors.initials: SA
authors.lastname: Toumi