PROPERTIES OF LANGMUIR MONOLAYERS OF NEWLY SYNTHESIZED SENSITIZER-DONOR DYADS CONTAINING A NAPHTHALENE AND A FERROCENE MOIETY

Two sets of amphiphilic sensitizer (S)-donor (D) dyad molecules and th eir reference compounds were newly synthesized by a new synthetic rout e. In the S-D dyads, two functional moieties were linked together with a saturated hydrocarbon chain containing the number of carbons of 4. In these compounds, a naphthalene and a ferrocene moiety act as S and D, respectively. The naphthalene or the ferrocene moiety was further l inked to another alkyl chain terminated with a carboxyl group,-COOH, t o form amphiphilic S-D dyads. The carboxyl group dissociates into a ca rboxylate anion and acts as a hydrophilic anionic head group. The stab ility of the monolayers of these anionic amphiphiles was increased by polyion complexation with a polycation added in the aqueous subphase i n comparison with calcium salt formation. Ion complexation (1:1) of ea ch anionic amphiphile with a cationic surfactant, octadecyl ammonium, was also performed at the air-water interface by spreading a chlorofor m solution of a 1:1 surfactant mixture. The resulting mixed monolayer was also substantially stable.