TY - JOUR
T1 - Free-base, copper(II) and zinc(II) derivatives of an azomethine bridged 'porphyrin-pyrene' dyad
T2 - Synthesis, spectroscopy and photochemistry
AU - Poddutoori, Prashanth Kumar
AU - Maiya, Bhaskar G.
PY - 2003/9
Y1 - 2003/9
N2 - Free-base, copper(II) and zinc(II) derivatives of a porphyrin-pyrene conjugate having an azomethine group separating the two photoactive subunits have been synthesized and fully characterized by mass (FAB), IR, UV/visible, 1H NMR and ESR spectroscopies and also by the cyclic- and differential pulse voltammetric methods. An analysis of the data reveals that the spectral and electrochemical properties of the individual chromophoric entities are retained and that there exists no specific π-π interaction between the porphyrin and pyrene subunits in these dyads. Excitation of CH2CI2 solutions of the free-base and zinc(II) derivatives at 550 nm results in no quenching of fluorescence due to the tetrapyrrolic moiety, but that at 290 nm results in a quenching of fluorescence due to the appended pyrene moiety. Excitation spectral data indicates that photons collected by the hydrocarbon subunit are effectively transferred to the porphyrin in both these donor-acceptor systems.
AB - Free-base, copper(II) and zinc(II) derivatives of a porphyrin-pyrene conjugate having an azomethine group separating the two photoactive subunits have been synthesized and fully characterized by mass (FAB), IR, UV/visible, 1H NMR and ESR spectroscopies and also by the cyclic- and differential pulse voltammetric methods. An analysis of the data reveals that the spectral and electrochemical properties of the individual chromophoric entities are retained and that there exists no specific π-π interaction between the porphyrin and pyrene subunits in these dyads. Excitation of CH2CI2 solutions of the free-base and zinc(II) derivatives at 550 nm results in no quenching of fluorescence due to the tetrapyrrolic moiety, but that at 290 nm results in a quenching of fluorescence due to the appended pyrene moiety. Excitation spectral data indicates that photons collected by the hydrocarbon subunit are effectively transferred to the porphyrin in both these donor-acceptor systems.
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M3 - Article
AN - SCOPUS:0345686438
SN - 0376-4710
VL - 42
SP - 2198
EP - 2204
JO - Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
JF - Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
IS - 9
ER -