SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A NEW LANTHANUM OXYCHLOROSULFIDE LA5TI6S3CL3O15

A new oxychlorosulfide compound La5Ti6S3Cl3O15 has been prepared from the reaction of LaOCl with a mixture of La2S3 and TIS2. Single crystal X-ray diffraction steadies show that this compound crystallizes in th e space group Im-3 (# 204) of the cubic system (a=12.4156(6) Angstrom, Z=4). Data collection was obtained using a CAD4 Enraf Nonius diffract ometer. Structural refinement was made with the program SHELXTL using 783 independent reflections. The final refinement resulted in conventi onal R factors, R-1=0.038 for 563 reflections, with F > 4 sigma(F), R= 0.069, and Rw (F-2)=0.126 for all reflections. The structure contains two types of La atoms with coordinations of 10 and 12, and Ti is in a distorted octahedral coordination to five oxygen atoms and one sulfur or chlorine atom. (C) 1998 Academic Press.