title: Synthesis and characterization of a new asymmetric bis-porphyrinato lanthanide complex presenting mixed hydrophilic-hydrophobic properties and its precursor form.
abstract: The synthesis and spectroscopic characterization of a new family of heteroleptic porphyrinate double-deckers are reported. The investigated compounds are represented by the formulae La(III)H(TPyP)(TPP) and [La(III)(TMePyP)(TPP)]I(3). UV-vis spectroscopy of the title complexes confirms the presence of a strong pi-pi interaction between the macrocycles in each derivative. With (1)H and 2-D NMR data, we were able to distinguish two major NMR regions: the endo, between the bonded macrocycles, and the exo, outside the macrocycles, which are characteristic features of porphyrinic double-deckers. Finally, the electrochemical study confirms the strong pi-pi interaction for La(III)H(TPyP)(TPP) and completes this first approach for the investigation of this new family of derivatives.
authors.affiliation: Chemistry Department, School of Sciences, University of Crete, PO Box 1470, 71409 Heraklion, Crete, Greece.
authors.forename: Georgios K
authors.initials: GK
authors.lastname: Tsikalas
authors.forename: Athanassios G
authors.initials: AG
authors.lastname: Coutsolelos