Abstract

<h2>Acta Crystallographica Section B</h2><h3>Structural Crystallography and Crystal Chemistry</h3><h3>0567-7408</h3> <h2>research papers</h2> Volume 26 Part 2 Pages 125-129 February 1970 <h2>The crystal structure of Ta 6 S</h2> H. F. Franzen and J. G. Smeggil 125 Acta Cryst. (1970). B26, 125 The Crystal Structure of Ta6S* BY H. F. FRANZEN AND J. G. SM~GGm Institute for Atomic Research and Department of Chemistry, Iowa State University, Ames, Iowa 50010, U.S.A. (Received 14 February 1969) The crystal structure of Ta6S has been determined from single-crystal X-ray diffraction data. The compound crystallizes in the monoclinic space group C2/c with unit-cell dimensions a = 14.16, b = 5"284, c= 14.79/~ and fl= 118.01 °. The unit cell contains eight formula units. Refinement of the structure with three-dimensional data was performed by a least-squares treatment of the positional parameters and the isotropic temperature factor coefficients. The metal grouping in the Ta6S structure is unlike that in other known metal-rich chalconide structures with the exception of TazS, to which it is closely related. The structure can be viewed as chains of body-centered pentagonal antiprisms of Ta atoms sharing faces in one direction and interconnected via sulfur atoms in the other two directions. The sulfur atoms are coordinated