Syntheses,crystal structures and near-infrared luminescent properties of holmium (Ho) and praseodymium (Pr) ternary complexes

摘要

A series of near-infrared (NIR) luminescent complexes Ho(dbm)3L and Pr(dbm)3L [where dbm = dibenzoylmethane;L = 1,10-phe-nanthroline (phen),2,2'-bipyridine (bipy),or triphenyl phosphate oxide (TPPO)] were synthesized. Their elemental analyses,crystal structures,fluorescence spectra and luminescent lifetimes were successfully investigated. After ligand-mediated excitation of the complexes,they all show the characteristic NIR luminescence of the corresponding Ln~(3+) ions (Ln = Ho,Pr),which can be attributed to efficient energy transfer from the ligands to the central Ln~(3+) ions,an antenna effect.