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Synthesis and Crystal Structure of Bis(methyltriphenylphosphonium) Hexabromotellurate(IV)‐bis{dibromoselenate(II)}, [PMePh 3 ] 2 [TeBr 6 (SeBr 2 ) 2 ], the Salt of a Mixed‐valence Bromotellurate(IV)‐Selenate(II) Anion
Author(s) -
Janickis Vitalijus,
Herberhold Max,
Milius Wolfgang
Publication year - 2003
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.200390013
Subject(s) - bromine , chemistry , molecule , triclinic crystal system , bromide , stereochemistry , medicinal chemistry , crystal structure , crystallography , organic chemistry
Brown crystals of [PMePh 3 ] 2 [TeBr 6 (SeBr 2 ) 2 ] ( 1 ) were obtained when selenium and bromine (1:1) react in acetonitrile solution in the presence of tellurium(IV) bromide and methyltriphenylphosphonium bromide. The salt 1 crystallizes in the triclinic space group P1¯ with the cell dimensions a = 10.3630(14)Å, b = 11.5140(12)Å, c = 11.7605(17)Å, α = 108.643(9)°, β = 106.171(10)° and γ = 99.077(9)° (296 K). In the solid state the [TeBr 6 (SeBr 2 ) 2 ] 2— anion contains a nearly regular [TeBr 6 ] octahedron where the four equatorial bromo ligands each have developed a bond to the Se II atom of a SeBr 2 molecule. The contacts between the bridging bromo and the Se II atoms of the SeBr 2 molecules are observed in the range 3.11—3.21Å, and can be interpreted as bonds of the donor‐acceptor type with the bridging bromo ligands as donors and the SeBr 2 molecules as acceptors. The Te IV —Br distances are in the range 2.67—2.72Å, and the Se II —Br bond lengths in coordinated SeBr 2 molecules in the range 2.33—2.34Å.