Axial-bonding heterotrimers based on tetrapyrrolic rings: Synthesis, characterization, and redox and photophysical properties

作者：Giribabu Lingamallu^*; Kumar Challuri Vijay; Reddy Paidi Yella

来源：Chemistry-An Asian Journal, 2007, 2(12): 1574-1580.

DOI：10.1002/asia.200700202

• fluorescence spectroscopy
• oligomers
• photoinduced electron transfer
• phthalocyanines
• porphyrins

We prepared two heterooligomeric arrays based on free base/metalloporphyrins at axial positions and a metalloid phthalocyanine as a basal scaffolding unit by using the axial-bonding capabilities as well as the known oxophilicity of dihydroxytin(IV) phthalocyanine. Both heterotrimers were completely characterized by elemental analysis, MALDI-TOF MS, and H-1 NMR (one- and two-dimensional), UV/Vis, and fluorescence spectroscopy as well as cyclic voltammetry. The ground-state properties indicate that there is minimal pi-pi interaction between the macrocyclic units. The excited-state properties show that there is electronic energy transfer competing with photoinduced electron transfer from the singlet state of the axial porphyrin to the central metalloid phthalocyanine and a photoinduced electron transfer from the ground state of the axial porphyrin to the singlet state of the central metalloid phthalocyanine.

• 出版日期2007