Langmuir-Schafer Films of Functional Amphiphilic Nickel(II) and Zinc(II) Schiff Base Complexes

The synthesis of novel functional amphiphilic dipodal Ni(II) (1) and Zn(II) (2) Schiff base complexes and the preparation/characterization and optical properties of Langmuir-Schafer (LS) multilayer films are reported. The existence of stacked 31) aggregates is observed for all films, as established by the combination of reflection spectroscopy and Brewster angle microscopy. Although aggregate formation does not involve major electronic changes, as evidenced by analysis by absorption spectroscopy, fluorescence emission is Much more sensitive to the chemical environment, and complete quenching is observed in the multilayer LS aggregates. However, in the limit of negligible interchromophore interactions, achieved by means of mixed LS multilayer films the fluorescence is restored by using arachidic acid as a spacer diluent, and LS layers of 2 behave as related self-assembled monolayers. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) RI Sortino, Salvatore/E-4684-2011; Di Bella, Santo/A-5592-2008

The synthesis of novel functional amphiphilic dipodal Ni(II) (1) and Zn(II) (2) Schiff base complexes and the preparation/characterization and optical properties of Langmuir-Schafer (LS) multilayer films are reported. The existence of stacked 31) aggregates is observed for all films, as established by the combination of reflection spectroscopy and Brewster angle microscopy. Although aggregate formation does not involve major electronic changes, as evidenced by analysis by absorption spectroscopy, fluorescence emission is Much more sensitive to the chemical environment, and complete quenching is observed in the multilayer LS aggregates. However, in the limit of negligible interchromophore interactions, achieved by means of mixed LS multilayer films the fluorescence is restored by using arachidic acid as a spacer diluent, and LS layers of 2 behave as related self-assembled monolayers. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)