Synthesis, spectroscopic characterizations, cyclic voltammetry investigation and molecular structure of the high-spin manganese(III) trichloroacetato meso-tetraphenylporphyrin and meso-tetra-(para-bromophenyl)porphyrin complexes

The synthesis of trichloroacetato manganese(III) complexes (1 and 2) with meso-porphyrins, namely 5,10,15,20-tetraphenylporphyrin (H2TPP) and the 5,10,15,20-tetra-(para-bromophenyl)porphyrin (H2TBrPP), are described. These two derivatives were characterized by UV/Vis, IR and 1H NMR spectra, which indicate that these Mn(III) complexes are high-spin (S=2). The cyclic voltammograms of 1 and 2, and two chloroacetato Mn(III) porphyrins are similar and resemble those of five-coordinated Mn(III) high-spin porphyrins. Notable, the molecular structures of 1 and 2 exhibit face to face π–π dimer formation with PC⋯PC distances of 3.69 and 3.88Å, and Mn⋯Mn distances of 5.57 and 4.80Å, respectively.