The adsorption and decomposition of BIS(Benzene)chromium on Ni(100)

Abstract

We have studied the bis(benzene) chromium/Ni(100) chenusorption system using TPD, AES, XPS, UPS, and exchange of isotopically labeled molecules. Low coverages of the metal complex are completely decomposed in TPD to produce C (a), Cr (a), and H 2(g). At higher coverages, molecular benzene desorption is observed at ≅ 480 K, and, at still higher coverages, multilayer and monolayer molecular bis(benzene)chromium desorption occur at ≅ 250 and 300 K, respectively. Post-dosed C 6D 6 exchanges with C 6H 6 into the monolayer desorption, indicating along with XPS evidence that monolayer bis(benzene)chromium undergoes ligand separation below 300 K. Uncomplexed benzene desorbs at ≅ 160 K from multilayer bis(benzene) chromium; explanations for this are discussed. UPS of monolayer and multilayer benzene and bis(benzene)chromium are compared.