appears from the limited data presented here that the grown oxides are fairly good substrates for ionic absorption. In the language of hard and soft acids,14 Al3+ is a very hard acid and prefers hard bases. This explains the preference for Al-OCN (rather than Al-NCO) and Al-NCS (rather than Al-SCN). It does not, however, completely explain the weak presence of Al-SCN and the complete absence of Al-CN. We infer from these data that ionic species can be stably adsorbed to A1203 from solution provided they present an external surface which may act as a hard base without modifying the ion.We may use the previous conclusions to address the second question posed. If one is to successfully incorporate transition metal complexes into Al-Al203-Pb diodes from fluid solution, it will be helpful to have one or more ligands which present a hard base "external surface." That is, one would expect the complex CH3Hg-SCN to be much more stable on, and adsorb better to, aluminum oxide than the complex (CH3)3Si-NCS. As to the stability of metal cyanide complexes, we have gained pertinent, though negative, information. Our results indicate that the cyanide ion is not dissociating from the metal to preferentially bond to the aluminum. This leaves two other possibilities which we are investigating: (a) the CNp referentially bonds to the "soft" lead top electrode, or (b) the decomposition is due to an oxidation-reduction process.This work has definitely identified the 2145-cm'1 band
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