New synthetic methodology and luminescent properties of lanthanide-cored supramolecular complexes based on metalloporphyrins for optical amplification

We have investigated the development of lanthanide-cored supramolecular complexes containing porphyrins to circumvent the solubility problem and improve the optical amplification property. The new synthetic methodology has been developed and accomplished through the ligand-exchange model reaction using ErCl3 to optimize its synthetic condition. First, we designed and synthesized the model compounds to investigate coordination property between the ligand and the lanthanide ion. In addition, with these synthetic results, lanthanide-cored supramolecular complexes based on porphyrins were synthesized and characterized. Highly coordinated lanthanide-cored model complexes (at least 8 to 10 coordination) showed the strong near infrared emission at 1525 nm, corresponding to the characteristic 4I13/2→ 4I15/2 transition of trivalent erbium ions.