1. Baker, L. C. W. In: Advances in the Chemistry of Coordination Compounds’ ,Kirschner S., Ed.; MacMillan: New York, 1961; p. 604.
2. d’Amour, H. Acta Crystallogr. 1976, B32, 729.
3. Dawson, B. Acta Crystallogr. 1953, 6, 113.
4. Wells, A. F. Structural Inorganic Chemistry ,Clarendon Press: Oxford, 1945; p. 344.
5. The case today in 1992 is only somewhat advanced from the conclusion of a 1976 workshop of experts who concluded that (in 1976) “no definitive proof of any structure of an oxide-supported catalysts has been reported”. 3a With modern methods such as EXAFS, some progress has been made in proposing poisoned catalyst structures (e.g. Rh(CO)2-Al2O3) 3b or crude catalyst “structures” con-structed from EXAFS distance information only (plus chemical intuition), but even that work has not been able to provide complete structures at the atomic level. 3c