A series of resorcinarene-PAMAM-porphyrin dendrimers was synthesized. The
nanostructures were characterized by IR, 1H and 13C NMR, UV-vis absorption, electrospray
ionization and MALDI-TOF mass spectrometry. The morphological properties were
characterized by High-Resolution Transmission Electron Microscopy (HRTEM). The distance
between the resorcinarene group and the porphyrin group was variable: two different
lengths of the dendritic branches were synthesized, which were found to play an important
role in influencing the fluorescence properties. It was also possible to observe by HRTEM
microscopy that the dendrimers were nearly monodisperse, retained their size and their
shape was roughly spherical. Experimental data confirmed that the PAMAM groups favored
the intense emission and red shift of the maximum wavelength. It is possible that
the fluorescence centers were perturbed by the inner influence between the PAMAM groups. These nanostructures
could be used for the conversion of photoenergy.
Keywords: Resorcinarene, PAMAM, porphyrin, dendrimers, nanostructured multiporphyrin, spectroscopic properties.
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