Solvothermal synthesis of self-assembled free-based porphyrin wires

A family of well-defined prophyrin wires, 5,10,15,20-tetrakis(4-N-ethylpyridyl)porphyrin salts [H 2 TEPyP 4+ .A] (A = 2CdI 4 2- 1; 6I - 2; 4I - 3), has been synthesized by hydrothermal methods and was structurally characterized by X-ray single-crystal diffraction. Controlling the packing of π-π stacking backbones was achieved by means of adjusting the counterbalanced anions: tetragonal packing for 1 and 2; hexagonal-like for 3. The optical properties related to the packing structures were studied by solid-state diffuse reflectance spectra. The blue-shift of Soret band demonstrated the H-aggregate form in the porphyrin wires.