One of the interesting properties of distibines R2Sb-SbR2 is the deep color of certain such derivatives with relatively compact R groups. For example, crystals of 2,2',5,5'-tetramethylbistibole (I) reflect iridescent purple-blue light and appear red to transmitted light, but they melt reversibly to a pale yellow oil at 99 °C.' X-ray diffraction studies on crystalline I indicate the presence of an antimony chain Sb-Sb-Sb-Sb-in which the short Sb-Sb distances are 2.835 Á and the long Sb-Sb distances are 3.625 Á. Extended HQckel molecular orbital calculations1 2 suggest that the presence of this chain is responsible for the thermochromic properties of I. This communication reports the first example of a tellurium complex, namely {Te2(S2PPh2)2]"
The analysis consisted of taking a known weight of the alloy and decomposing with water. An aliquot of the solution was titrated with standard acid for hydroxide ion. A second aliquot was treated with excess sodium tetraphenylborate. and the weight of the precipitated potassium and cesium tetraphenylborates determined (H. Flaschka and A. While reaction at -50 OC was deemed necessary to keep all the alloy in a liquid phase, reaction at this temperature for 1.5 h resulted in some 70% yield of 3, unreacted 1,1, I-triphenylethane, and unknown prcduct(s) rather than the nearly quantitative yield' of 3 found at -70 O C .(5) L. Hackspill. h o c .
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