title: Na[Li(NH2BH3)2]--the first mixed-cation amidoborane with unusual crystal structure.
abstract: We describe the successful synthesis of the first mixed-cation (pseudoternary) amidoborane, Na[Li(NH(2)BH(3))(2)], with theoretical hydrogen capacity of 11.1 wt%. Na[Li(NH(2)BH(3))(2)] crystallizes triclinic (P1) with a = 5.0197(4) Å, b = 7.1203(7) Å, c = 8.9198(9) Å, α = 103.003(6)°, β = 102.200(5)°, γ = 103.575(5)°, and V = 289.98(5) Å(3) (Z = 2), as additionally confirmed by Density Functional Theory calculations. Its crystal structure is topologically different from those of its orthorhombic LiNH(2)BH(3) and NaNH(2)BH(3) constituents, with distinctly different coordination spheres of Li (3 N atoms and 1 hydride anion) and Na (6 hydride anions). Na[Li(NH(2)BH(3))(2)], which may be viewed as a product of a Lewis acid (LiNH(2)BH(3))/Lewis base (NaNH(2)BH(3)) reaction, is an important candidate for a novel lightweight hydrogen storage material. The title material decomposes at low temperature (with onset at 75 °C, 6.0% mass loss up to 110 °C, and an additional 3.0% up to 200 °C) while evolving hydrogen contaminated with ammonia.
authors.affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland.
authors.forename: Karol J
authors.initials: KJ
authors.lastname: Fijalkowski
authors.forename: Radostina V
authors.initials: RV
authors.lastname: Genova
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Filinchuk
authors.forename: Armand
authors.initials: A
authors.lastname: Budzianowski
authors.forename: Mariana
authors.initials: M
authors.lastname: Derzsi
authors.forename: Tomasz
authors.initials: T
authors.lastname: Jaroń
authors.forename: Piotr J
authors.initials: PJ
authors.lastname: Leszczyński
authors.forename: Wojciech
authors.initials: W
authors.lastname: Grochala