title: Hydrides of Alkaline Earth-Tetrel (AeTt) Zintl Phases: Covalent Tt-H Bonds from Silicon to Tin.
abstract: Zintl phases form hydrides either by incorporating hydride anions (interstitial hydrides) or by covalent bonding of H to the polyanion (polyanionic hydrides), which yields a variety of different compositions and bonding situations. Hydrides (deuterides) of SrGe, BaSi, and BaSn were prepared by hydrogenation (deuteration) of the CrB-type Zintl phases AeTt and characterized by laboratory X-ray, synchrotron, and neutron diffraction, NMR spectroscopy, and quantum-chemical calculations. SrGeD4/3-xand BaSnD4/3-xshow condensed boatlike six-membered rings of Tt atoms, formed by joining three of the zigzag chains contained in the Zintl phase. These new polyanionic motifs are terminated by covalently bound H atoms with d(Ge-D) = 1.521(9) Å and d(Sn-D) = 1.858(8) Å. Additional hydride anions are located in Ae4tetrahedra; thus, the features of both interstitial hydrides and polyanionic hydrides are represented. BaSiD2-xretains the zigzag Si chain as in the parent Zintl phase, but in the hydride (deuteride), it is terminated by H (D) atoms, thus forming a linear (SiD) chain with d(Si-D) = 1.641(5) Å.
authors.forename: Henry
authors.identifier: http://orcid.org/0000-0002-8624-4617
authors.initials: H
authors.lastname: Auer
authors.forename: Robin
authors.initials: R
authors.lastname: Guehne
authors.forename: Marko
authors.initials: M
authors.lastname: Bertmer
authors.forename: Sebastian
authors.initials: S
authors.lastname: Weber
authors.affiliation: Department of Inorganic Solid-State Chemistry, Saarland University , Am Markt, Zeile 3, 66125 Saarbrücken, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Wenderoth
authors.affiliation: Institut Laue-Langevin , 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France.
authors.forename: Thomas Christian
authors.initials: TC
authors.lastname: Hansen
authors.forename: Jürgen
authors.initials: J
authors.lastname: Haase
authors.forename: Holger
authors.initials: H
authors.lastname: Kohlmann