title: Versatile host for metallo anions and cations.
abstract: The crystal structures of two metallo oxides, perrhenate and dichromate, are reported with a diprotonated tetraamido/diamino-based macrocycle, L, in which the floppy ligand assumes a folded conformation. When the four amides are deprotonated, this same ligand binds transition-metal ions in its tetraanionic form, H-4L. For the divalent metal ions Cu2+ and Ni2+, H-4L again folds and dinuclear complexes are formed. With trivalent metal ions Co3+ and Fe3+, the ligand wraps about the metal ions, resulting in mononuclear complexes.
authors.affiliation: Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA.
authors.forename: Sanjib
authors.initials: S
authors.lastname: Ghosh
authors.forename: Brian
authors.initials: B
authors.lastname: Roehm
authors.forename: Rowshan Ara
authors.initials: RA
authors.lastname: Begum
authors.forename: Jerry
authors.initials: J
authors.lastname: Kut
authors.forename: Md Alamgir
authors.initials: MA
authors.lastname: Hossain
authors.forename: Victor W
authors.initials: VW
authors.lastname: Day
authors.forename: Kristin
authors.initials: K
authors.lastname: Bowman-James