A COBALT- SELENIUM CLUSTER WITH TRIPHENYLPHOSPHINE: PREPARATION AND STRUCTURE OF CCo6Se8（PPh3）6·THF

摘要

＜正＞ Compound Co6Sc8（Ph3P）6 was obtained by mixing CoBr2, Ph3P, and Na2Se2 in DMF in high yield. It crystallizcs in triclinic system with space group Pland the following unit cell dimensions; a=15. 165（4） ,b= 16. 522 （4） ,c = 21. 274 （5） A .α= 92. 75（2）,β=90. 56（2）,γ=102.47（2）°,V = 5197. 4 A3.Z = 2,DC=1. 68g/cm3. The final refinement converged with R-. 048 and Rw =0. 059 for 8175 reflections with I≥3σ（I）. The molecular structure consists of a slightly distorted octahedral Co6-core. The Co-Co distances fall in the range of 2. 955 - 3. 032A.