Molecular assemblies based on DNA-mimetics: Effect of monolayer matrix on photopolymerization of diacetylene-containing nucleobase monolayers

Pressure-area isotherm of a ternary component monolayer of nucleobase amphiphiles, diacetylene-containing adenine and thymine amphiphiles (DA-Ade and DA-Thy), and octadecylcytosine (C₁₈-Cyt), on the aqueous dT₃₀ subphase was changed by addition of poly(G) into the subphase. Photopolymerization of the ternary monolayers on the aqueous dT₃₀ solution was almost identical with that of a binary monolayer (DA-Ade/DA-Thy) on the same subphase. Addition of poly(G) into the subphase suppressed photopolymerization of the ternary monolayer. Since the DA-Ade/DA-Thy pairs complexed with dT₃₀ were clustered in the C₁₈-Cyt matrix, both intra- and inter-complex polymerization were occurred on the dT₃₀ subphase. The inter-complex polymerization was restrained by mixing with C₁₈-Cyt / poly(G) matrix.