title: Lanthanoid "bottlebrush" clusters: remarkably elongated metal-oxo core structures with controllable lengths.
abstract: Large metal-oxo clusters consistently assume spherical or regular polyhedral morphologies rather than high-aspect-ratio structures. Access to elongated core structures has now been achieved by the reaction of lanthanoid salts with a tetrazole-functionalized calixarene in the presence of a simple carboxylate co-ligand. The resulting Ln19 and Ln12 clusters are constructed from apex-fused Ln5O6 trigonal bipyramids and are formed consistently under a range of reaction conditions and reagent ratios. Altering the carboxylate co-ligand structure reliably controls the cluster length, giving access to a new class of rod-like clusters of variable length.
authors.affiliation: Department of Chemistry, Curtin University , Bentley, Western Australia 6102, Australia.
authors.forename: Daniel
authors.initials: D
authors.lastname: D'Alessio
authors.forename: Alexandre N
authors.initials: AN
authors.lastname: Sobolev
authors.forename: Brian W
authors.initials: BW
authors.lastname: Skelton
authors.forename: Rebecca O
authors.initials: RO
authors.lastname: Fuller
authors.forename: Robert C
authors.initials: RC
authors.lastname: Woodward
authors.forename: Nigel A
authors.initials: NA
authors.lastname: Lengkeek
authors.forename: Benjamin H
authors.initials: BH
authors.lastname: Fraser
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Massi
authors.forename: Mark I
authors.initials: MI
authors.lastname: Ogden