title: K(6)Tl(2)Sb(3), a zintl phase with a novel heteroatomic (1)(infinity)[Tl4Sb(6)(12-)] chain.
abstract: The title compound with heteratomic anionic chains [Tl(4)Sb(6)(12)(-)] has been discovered in the K-Tl-Sb system. The phase is obtained from a range of compositions near K(3)TlSb(1.5) following reaction first at 750-850 degrees C and then at 550 degrees C for one week or more. It crystallizes in the monoclinic system in space group C2/c, Z = 8, a = 9.951(1) A, b = 17.137(3) A, c = 19.640(6) A, and beta = 104.26(3) degrees. Swing-like (Tl(4)Sb(6))(12)(-) units consisting of alternating Sb and Tl atoms in four- and eight-membered rings are linked through Tl-Tl bonds to form infinite one-dimensional chains along a. EHTB calculations and resistivity measurements show that the compound is a semiconductor.
authors.affiliation: Ames Laboratory-DOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: L
authors.initials: L
authors.lastname: Chi
authors.forename: J D
authors.initials: JD
authors.lastname: Corbett