title: Trianionic organoborate triangles.
abstract: The rigid, angular ligand 3,3,3',3'-tetramethyl-1,1'spirobisindane-5,5',6,6'-tetrol, LH4, in the form of its tetra-anion, L(4-), affords crystalline compounds containing the triangular macrocyclic boron derivative [B3L3](3-) with the counter cations, triethylammonium, imidazolium, tetraethylammonium, and protonated dabco (dabco = 1,4-diazabicyclo[2,2,2]octane). Within a triangular unit all three chiral L(4-) ligands have the same hand although the crystal does contain a racemic mixture of macrocycles. In all four compounds, one out of the three counter-cations per macrocycle is bound inside the macrocycle.
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010, Australia. bfa@unimelb.edu.au
authors.forename: Brendan F
authors.initials: BF
authors.lastname: Abrahams
authors.forename: Berin A
authors.initials: BA
authors.lastname: Boughton
authors.forename: Haozhen
authors.initials: H
authors.lastname: Choy
authors.forename: Oliver
authors.initials: O
authors.lastname: Clarke
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Grannas
authors.forename: David J
authors.initials: DJ
authors.lastname: Price
authors.forename: Richard
authors.initials: R
authors.lastname: Robson