Preparation of the Binary Technetium Bromides: TcBr3 and TcBr4

摘要

TcBr3 (1) and TcBr4 (2) were synthesized by reaction of Tc metal with elemental bromine at 400 degrees C. Single crystal XRD measurements indicate that TcBr3 Crystallizes in the orthorhombic space group Pmmn (a = 11.0656(2) angstrom, b = 5.9717(1) angstrom, c = 6.3870(1) angstrom). The structure consists of infinite chains of face-sharing TcBr6 octahedra with a regular alternation of short and tong Tc-Tc distances (2.8283(4) angstrom, 3.1434(4) angstrom). TcBr4 crystallizes in the orthorhombic space group Pbca (a = 6.3237(5) angstrom, b = 12.1777(9) angstrom, c = 14.7397(11) angstrom). TcBr4 contains infinite chains of edge-sharing TcBr6 octahedra with no apparent metal-metal bond (Tc-Tc = 3.7914(4) angstrom). Technetium tribromide is isomorphous with RuBr3 and MoBr3, while TcBr4 is isomorphous with PtBr4 and OsBr4.