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Synthesis and Crystal Structure of K 6 Ti 6 S 18 O: A New Coordination Compound Containing Discrete Ti 6 O Units in a Chalcogenide Environment
Author(s) -
Tillinski Ralf,
Näther Christian,
Winkler Björn,
Bensch Wolfgang
Publication year - 2001
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 - 10.1002/1521-3749(200112)627:12<2576::aid-zaac2576>3.0.co;2-a
Subject(s) - triclinic crystal system , crystal structure , crystallography , octahedron , chemistry , stoichiometry , materials science , stereochemistry
The new compound K 6 Ti 6 S 18 O was prepared by the reaction of stoichiometric amounts of K 2 S 5 , Ti, TiO, and S at 400 °C. It crystallises in the triclinic space group P1 with a = 9.602(2) Å, b = 9.682(2) Å, c = 9.856(2) Å, α = 104.78(1)°, β = 107.04(3)°, γ = 112.56(1)°, V = 735.6(3) Å 3 , Z = 1. The structure is comprised of discrete [Ti 6 S 18 O] 6– anions separated by K + cations. The main structural feature is a Ti 6 octahedron which is centred by an interstitial oxygen atom yielding the Ti 6 O unit. This unit is surrounded by a S 8 cube and every Ti atom is bound to terminal S 2– or S 2 2– anions. The anion may be described as {[Ti 6 (O)S i 8 ](S 2– ) a 2 (S 2 2– ) a 4 } 6– .