Investigation of calix[4]arene–porphyrin and its Palladium(II) and Zinc(II) complexes at air/water interface and in Langmuir–Blodgett film

Abstract

Calix[4]arene–porphyrin and its Palladium(II) and Zinc(II) complexes are synthesized and studied at air/water interface and in Langmuir–Blodgett film. Their properties are measured by pressure–area isotherm, UV–Visible and Fourier transform infrared spectroscopy. Molecular geometry of the calix[4]arene–porphyrin compound is optimized at ab initio RHF/STO-3G level. UV–Visible spectra of the three compounds confirm that the π–π interaction of porphyrin moieties induces H-aggregation of the calix[4]arene–porphyrin and its Palladium complex and J-aggregation of its Zinc complex in Langmuir–Blodgett film. The ordering of alkyl chain for the three compounds is discussed based on infrared data, which is confirmed by their pressure–area isotherms at aqueous subphase.