title: Complete Series of Alkali-Metal M(BH3NH2BH2NH2BH3) Hydrogen-Storage Salts Accessed via Metathesis in Organic Solvents.
abstract: We report a new efficient way of synthesizing high-purity hydrogen-rich M(BH3NH2BH2NH2BH3) salts (M = Li, Na, K, Rb, Cs). The solvent-mediated metathetic synthesis applied here uses precursors containing bulky organic cations and weakly coordinating anions. The applicability of this method permits the entire series of alkali-metal M(BH3NH2BH2NH2BH3) salts (M = Li, Na, K, Rb, Cs) to be obtained, thus enabling their comparative analysis in terms of crystal structures and hydrogen-storage properties. A novel polymorphic form of Verkade's base (C18H39N4PH)(BH3NH2BH2NH2BH3) precursor was also characterized structurally. For all compounds, we present a comprehensive structural, spectroscopic, and thermogravimetric characterization (PXRD, NMR, FTIR, Raman, and TGA/DSC/MS).
authors.affiliation: Faculty of Chemistry, University of Warsaw , ul. Pasteura 1, 02-093 Warsaw, Poland.
authors.forename: Rafał
authors.initials: R
authors.lastname: Owarzany
authors.affiliation: Centre of New Technologies, University of Warsaw , ul. Zwirki i Wigury 93, 02-089 Warsaw, Poland.
authors.forename: Karol J
authors.initials: KJ
authors.lastname: Fijalkowski
authors.affiliation: Centre of New Technologies, University of Warsaw , ul. Zwirki i Wigury 93, 02-089 Warsaw, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Jaroń
authors.affiliation: Centre of New Technologies, University of Warsaw , ul. Zwirki i Wigury 93, 02-089 Warsaw, Poland.
authors.forename: Piotr J
authors.initials: PJ
authors.lastname: Leszczyński
authors.affiliation: Faculty of Chemistry, University of Warsaw , ul. Pasteura 1, 02-093 Warsaw, Poland.
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Dobrzycki
authors.affiliation: Faculty of Chemistry, University of Warsaw , ul. Pasteura 1, 02-093 Warsaw, Poland.
authors.forename: Michał K
authors.initials: MK
authors.lastname: Cyrański
authors.affiliation: Centre of New Technologies, University of Warsaw , ul. Zwirki i Wigury 93, 02-089 Warsaw, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Grochala