1. Supported in part by the National Science Foundation under Grant No. 7034X
2. Address correspondence to this author at: Department of Chemistry, The Texas A and M University, College Station, Texas 77843
3. On leave from San Fernando Valley State College, 1971–72, as an N.S.F. Science Faculty Fellow
4. Cotton , F. A. and
Wilkinson , G. 1972. Advanced Inorganic Chemistry, 3rd Ed., 40–43. John Wiley-Interscience. Cf.