4] X-ray structural analyses on a Stoe-IPDS diffractometer with Mo,, (i = 0.71073 A): data collection and refinement for C,,,H,,,P,Ag,Te, 1 at 190 K : yellow plate, 0.55 x 0.55 x 0.02 mm, trigonal, space group R3, u =14.255(1). c = 56.896(4)& V = 1 0 0 1 3 ( l ) A 3 , Z = 3,p,.,,, =1.896gcm-', p = 33.30 cm I . 2$,,, = 45.0". 9702 reflections collected, 5062 independent (R,,, = 0.0642) and 4629 observed [F,>4a(Fo)]. The structure was solved by direct methods and refined on F2 using SHELXTL software. Data were corrected for Lorentz and polarization effects. No absorption correction was applied. All Ag. Te. and P atoms were refined anisotropically and hydrogen atoms were not included (177 parameters). Final R = 0.0678 and UR, = 0.1899 with GOF =1.077 and an absolute structure parameter = -0.06 (7). Largest difference peak and hole =1.62 and -0.94 e k ' , respectively. support and Professor A. H. Maki for helpful discussions. [**I We thank the National Science Foundation (grant no. CHE 9321 257) for 1179 ~. Anpeu' c h P m . Inr Ed E n d 1997. 36. N o . I f (3 VCH Verlugsgesellscha/t mbH, 0-69481 Weinheim, 1997 0.570-0833/97/3611-lJ79 $ 17.50+ .50/0