The trithiolato diruthenium(II)-arene compounds can also act as azide partner in click reactions. Azidefunctionalized compound 9 was synthesized following a two-step process (Scheme 3 (top)). The hydroxy group of 4 was activated by mesylation with MsCl in basic conditions (TEA, triethylamine), followed by the nucleophilic substitution with azide (NaN3); 9 was isolated in 66% yield over two steps. Attempts to synthesize 10 using other literature protocols were unsuccessful (either the azide was not obtained, or the conversion was lower).