title: Guanidinium ion as a symmetrical template in the formation of cubic hydrogen-bonded borate networks with the boracite topology.
abstract: Reaction between boric acid and guanidinium salts in methanolic solution at room temperature in the presence of various bases and anions gives well-formed solvated crystals of composition {[B(OCH3)4]3[C(NH2)3]4}+X-. The products in which X- = Cl- and PF6- are characterized by single-crystal X-ray diffraction. The tetramethoxyborate and guanidinium components form a highly symmetrical (cubic) hydrogen-bonded 3D network having the "boracite topology" [i.e., the (63)(6284) topology]. Highly disordered solvent molecules and anions occupy methyl-surfaced cavities and channels that represent more than 30% of the space.
authors.affiliation: School of Chemistry, University of Melbourne, Victoria 3010, Australia.
authors.forename: Brendan F
authors.initials: BF
authors.lastname: Abrahams
authors.forename: Marissa G
authors.initials: MG
authors.lastname: Haywood
authors.forename: Richard
authors.initials: R
authors.lastname: Robson