Inter-ring overlap integrals in dimer complexes of phthalocyanines and porphyrins

Water-soluble quaternized mercaptopyridine-substituted zinc-phthalocyanines: Synthesis, photophysical, photochemical and bovine serum albumin binding properties

“…The red-shifts are observed 15 nm between 5 and 7, and 6 nm between 8 and 10. The observed red spectral shifts are typical of Pcs with substituents at the non-peripheral positions and have been explained in the literature [53,54]. The red-shift was observed for octa-peripherally substituted complex (6) compared to tetra-peripherally substituted complex (7) due to increase in the number of 2-mercaptopyridine groups which increase the electron donation due to sulfur atoms on the phthalocyanine framework for octa substitution.…”

Water-soluble cationic gallium(III) and indium(III) phthalocyanines for photodynamic therapy

“…The red-shifts are 21 nm between np-GaPc and p-GaPc, 12 nm between Qnp-GaPc and Qp-GaPc, 19 nm between np-InPc and p-InPc, and 11 nm between Qnp-InPc and Qp-InPc. The observed red spectral shifts are typical of Pcs with substituents at the non-peripheral positions and have been explained in the literature [51,52]. The B-bands are broad due to the superimposition of the B 1 and B 2 bands in the 320 to 370 nm region.…”

Highly efficient dye-sensitized solar cells based on metal-free and copper(II) phthalocyanine bearing 2-phenylphenoxy moiety

“…The Q bands of the non-peripherally substituted Pcs 3 and 5 were red-shifted when compared to the corresponding peripherally substituted Pcs 4 and 6 in the solvents. The observed red-shifts, 15 nm between 3 and 4, and 16 nm between 5 and 6 in toluene were typical of Pcs with substituents at the non-peripheral positions due to the linear combination of the atomic orbitals (LCAO) coefficients at the non-peripheral positions of the highest occupied molecular orbital (HOMO) being greater than those at the peripheral positions as explained in the literature [38,39].…”