Preparation and Characterization of Chromophores Pillared Zn-Al-LDH

A pair of chromophores with donor-acceptor properties, coumarin-3-carboxylic acid (3-CCA) and 9-anthracene carboxylic acid (9-ACA), were intercalated into the layered double hydroxide (LDH), ￡ n0.66Al0.34(OH)2￡ CO3) 0.17 ¤0.33H2O by the method of ion-exchange procedures in ethylene glycol. The co-intercalation compounds with different molar ratios of donor to acceptor in the solid products were obtained by controlling ion-exchange time, temperature, and the molar ratio of donor to acceptor in the solution. The obtained co-intercalation compounds were characterized by X-ray diffraction, infrared and thermogravimetry techniques. The photochemical properties of the obtained compounds were studied by UV-Vis absorption and fluorescence spectroscopy. These results indicate that the pair of chromophores, 3-CCA and 9-ACA within the interlayer region of the host can give rise to energy transfer processes because of the characteristics of their excited states.