Fig. 8. MALDI-TOF mass spectrum (positive-ion mode) of the polymeric material Ac-His-6-MBHA-1e obtained by reaction of Ac-His-6 with a ten-fold excess of compound 1e. The polymerization degree of the corresponding Ac-His molecule is reported for each monoisotopic mass peak along with the grafting degree (i.e. the number of naphthalene substituents for each Ac-His molecule) noted in parentheses.