The effect of increasing chain length on the excited-state properties of two series of covalently linked zinc porphyrin oligomers has been investigated. One series has a 1,4-phenylene bridge, (PB)n with n = 1, 2, 3, and 5, and the other series has a 1,4-butadiynylene bridge, (yPy)n with n = 1-6. The two series differ dramatically in the nature of the porphyrin-porphyrin interaction. Flash-photolysis time-resolved microwave conductivity measurements (FP-TRMC) show that the excited singlet state (S1) of the (PB)n oligomers has a very small excess polarizability (
Materials by design for sustainable solutions in the energy, medical, transport, and engineering sectors
