Regiospecific synthesis of lanthanum(III) and neodymium(III) triple-decker (tetrakis-meso-(3-bromophenyl)-porphyrinato)(crownphthalocyaninates)
Abstract
The triple-decker complexes of symmetrical type [mBr4TPP]Ln[(15C5)4Pc]Ln[mBr4TPP] (Ln-mTD; Ln = La, Nd; [(15C5)4Pc] = tetra-(15-crown-5)-phthalocyaninato-ligand; [mBr4TPP] = tetrakis-meso-(3-bromophenyl)-porphyrinato-ligand) are synthesized for the first time with 43% and 36% yield. The applicability of the previously developed selective one-step synthetic approach for the preparation of the mentioned complexes is demonstrated and the limitations, determined by meta-substitution of meso-aryl-fragments, are revealed. The spectral features of the obtained complexes is determined by means of UV-vis and NMR spectroscopy. The hindered rotation of porphyrin meso-substituents in the obtained complexes and formation of statistical set of atropisomers are demonstrated.
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