Abstract
Palladium phthalocyanine (PdPc) covalently bonded to the internal framework of MCM-41 mesoporous structured silicates has been synthesized and studied by UV−vis steady-state absorption and fluorescence spectroscopy, and by pico- and femtosecond time-resolved emission spectroscopy in dichloromethane suspensions. We compare the results obtained for covalently bonded (MO-PdPc) and diffusion-formed (PdPc_MCM41) samples. A significant broadening of the diffuse transmittance spectra of both materials is observed. The effect is due to electrostatic and specific (through H-bonds) interactions of the guest with the host, but to some extent, formation of dimers also contributes to this broadening. However, only the MO-PdPc shows an additional absorption band around 708 nm. The static emission spectrum of MO-PdPc is different from that of PdPc, but it is similar to that of the metal-free phthalocyanine one. The results are explained in terms of confinement effect of the mesoporous material inducing deformation of th...
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