The chemisorption of methylhydrazine on PdrAl O : evidence 2 3 for the preparation of surface bound alkyldiazenato CH `NNq/fragments

Qualitative transmission infrared evidence is presented to show that the adsorption of methylhydrazine H3C`NH`NH2. on PdrAl2O3 at 325 K leads to the formation of a methyldiazenato H3C`NNq.surface fragment. Although methylhydrazine contains only single bonds, its adsorption at 325 K leads to the appearance of a vibrational peak near 1950 cmy1 where peaks for triple bonds are uniquely found. This proposed structural change is consistent with organometallic chemistry literature reports that describe the products of similar alkylhydrazine reactions with metal complexes as alkyldiazenato ligands. Literature reports of similar surface reactivity exclude alternate interpretations. This result illustrates how interesting stoichiometric processes on surfaces can be identified through the study of precedents within the organometallic chemistry literature. q2000 Elsevier Science B.V. All rights reserved.