Preparation and Properties of Gadolinium Homoleptic Double-and Triple-Decker Complexes Containing Tetrabenzoporphyrin Ligand

Abstract:

Two novel gadolinium sandwich-type complexes containing tetrabenzoporphyrin (TBP) ligands-Gd (TBP)₂ and Gd (TBP)₃ were prepared from porphyrin 1 and Gd (acac)₃. nH₂O under Ar by boiling 1, 2, 4-Tcb for 15~17h and 45~48 h respectively. Their structures are characterized by Uv-Vis, HR-MS and IR. The spectroscopic studies show that their longest-wavelength visible and near-IR absorption bands are obviously red-shifted due to the extension of the π conjugated systems in the TBP ring. The magnetic studies indicate that the observed value of χ_MT for Gd (TBP)₂ is close to the combined value of Gd (III) and porphyrin radical anion at room temperature and that antiferromagnetic interaction possibly results from the intramolecular spin exchange between the porphyrin π-radical electron and that the gadolinium f unpaired electrons dominates its magnetic properties over the whole temperature range while there is no magnetic interactions between two Gd (III) ions in Gd (TBP)₃ in the range from room temperature down to 20K and very weak antiferromagnetic coupling exsits between two Gd (III) ions below 20K.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 1816-1821
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.1816
• Online since: August 2013
• Authors: Qi Feng Liu
• Keywords: Double-Deckers, Gadolinium Metal, Sandwich-Like Complexes, Tetrabenzoporphyrin (TBP), Triple-Deckers

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