Abstract As part of our continuing efforts to develop second generation photodynamic therapeutic agents [1], we synthesized three pentacyclic azine dyes that were designed with the aid of MNDO calculations to absorb visible light having wavelengths longer than 600 nm. Photophysical measurements for the azine dyes 1, 4, 8, 11-tetraethyl-1, 2, 3, 4, 8, 9, 10, 11, 13-nonahydrodipyrazino [2, 3-b: 2′, 3′-i] phenazinium acetate, 13, 1, 4, 8, 11-tetraethyl- ...
