Metallo complexes of meso-phenothiazinylporphyrins: Synthesis, linear and nonlinear optical properties

Herein we described the synthesis and the structural characterization of series of metallo-meso-(phenothiazin-3yl)porphyrins containing Ni(II), Cu(II), Zn(II) or Pd(II) coordinated in the central cavity of the macrocycle and an increasing number of peripheral phenothiazine units (from one up to four). Their photophysical properties including UV-vis linear (one photon) and nonlinear (two photons) absorption and fluorescence emissions were investigated in solution or solid state. Fluorescence lifetimes of the new metallo-phenothiazinylporphyrins in the solid state were measured using a time correlated single-photon counting method. Nonlinear optical properties were observed using a Titanium: Sapphire femtosecond laser. Two-photon excited fluorescence emissions of red light for selected Zn(II)-, Cu(II)- and Pd(II)-meso-phenothiazinylporphyrins, as well as second harmonic generation in the case of some Cu(II)- and Pd(II)-meso-phenothiazinylporphyrins are reported. (C) 2015 Elsevier Ltd. All rights reserved.