title: Stoichiometrically controlled revocable self-assembled "spiro" versus quadruple-stranded "double-decker" type coordination cages.
abstract: The simple combination of Pd(II) with the tris-monodentate ligand bis(pyridin-3-ylmethyl) pyridine-3,5-dicarboxylate, L, at ratios of 1:2 and 3:4 demonstrated the stoichiometrically controlled exclusive formation of the "spiro-type" Pd1L2 macrocycle, 1, and the quadruple-stranded Pd3L4 cage, 2, respectively. The architecture of 2 is elaborated with two compartments that can accommodate two units of fluoride, chloride, or bromide ions, one in each of the enclosures. However, the entry of iodide is altogether restricted. Complexes 1 and 2 are interconvertible under suitable conditions.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036 (India); Department of Chemistry, University of Montreal, Montreal QC H3T-IJ4 (Canada).
authors.forename: Sreenivasulu
authors.initials: S
authors.lastname: Bandi
authors.forename: Amlan K
authors.initials: AK
authors.lastname: Pal
authors.forename: Garry S
authors.initials: GS
authors.lastname: Hanan
authors.forename: Dillip Kumar
authors.initials: DK
authors.lastname: Chand
keywords: anions; metal-to-ligand ratios; molecular double-decker; palladium; self-assembly