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β‐[SbI 2 ][AlI 4 ] – A Second Polymorph of Diiodidoantimony‐Tetraiodido Aluminate with a Polymeric Structure
Author(s) -
Eich Andreas,
Bredow Thomas,
Beck Johannes
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800221
Subject(s) - monoclinic crystal system , crystallography , raman spectroscopy , square pyramid , triiodide , crystal structure , polyhedron , tetrahedron , materials science , pyramid (geometry) , chemistry , ion , physics , mathematics , combinatorics , electrode , dye sensitized solar cell , optics , electrolyte , organic chemistry
The reaction of antimony triiodide and aluminum triiodide at 160 °C yields orange crystals of β‐[SbI 2 ][AlI 4 ] ( 1 ) via gas phase deposition. This second polymorph of [SbI 2 ][AlI 4 ] crystallizes monoclinic in space group P 2 1 / n and is built of [SbI 2 ] + and [AlI 4 ] – ions connected via long Sb–I bonds. Sb is coordinated in form of a distorted square pyramid. These SbI 5 polyhedra are connected alternately by edges and corners by almost regular tetrahedral tetraiodido aluminate units to undulated [SbI 2 AlI 4 ] n chains. This stands in contrast to the molecular structure of the α polymorph consisting of molecular, tetranuclear units ([SbI 2 ][AlI 4 ]) 2 . The Raman vibrational spectra were calculated at density‐functional (DFT) level and compared to the experimental spectrum. Additionally, the normal modes were analysed.