Radical and Photochemical Reactions on Diamond Surfaces

Aryl radicals may also be prepared from the respective diazonium salts by electrochemical reduction. The radicals obtained from this single electron transfer then react with the diamond surface, arylating it in the course of the process. Varying a bit with the reagent chosen, the resultant surface covering is about 13% of a monolayer. Depending on the substitution pattern of the aromatic compound, the most different functionalizations of diamond films can be achieved this way. For example, doubly meta-chlorinated or para-nitrated diazonium salts can be 

The major advantage of an arylation or alkylation lies in the very strong covalent bonding of the functional group to the diamond surface by way of a C-C-bond, which also reflects in the high stability of diamond films functionalized in this manner. 

Elsevier 2001), (b) EEL-spectra of diamond films reacted with different concentrations of 1,3-butadiene ( Oyo Butsuri Gakkai 1999). 

---