Sensitized Near-Infrared Luminescence From NdIII, YbIII and ErIII Complexes by Energy-Transfer From Ruthenium 1,3-Bis([1,10]Phenanthroline-[5,6-d]-Imidazol-2 -yl)Benzene

• Published in: Journal of fluorescence 2013-11, Vol.23 (6), p.1167-1172
• Main Authors: Singaravadivel, Subramanian, Velayudham, Murugesan, Babu, Eththilu, Mareeswaran, Paulpandian Muthu, Lu, Kuang-Lieh, Rajagopal, Seenivasan
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Attachment; Biochemistry; Biological and Medical Physics; Biomedical and Life Sciences; Biomedicine; Biophysics; Biotechnology; Original Paper
• ISSN: 1053-0509; 1573-4994
• DOI: 10.1007/s10895-013-1247-1

The luminescent ruthenium 1,3 -bis([1,10]phenanthroline-[5,6 -d]- imidazol-2 -yl)benzene (bpibH 2 ) complex, a potentially useful bridging ligand with a vacant diimine site, has been used as ‘ metallo ligand ’ to make heterodinuclear d–f complexes by attachment of a {Ln(dik) 3 } fragment (dik = 1,3-diketonate) at the vacant site. When Ln = Nd, Yb, or Er the lanthanide centre has low-energy f–f excited states capable of accepting energy from the 3 MLCT excited state of the Ru(II) centre, there is quenching in the 3 MLCT luminescence of the Ru(II) centre, that affords sensitized lanthanide(III) based luminescence in the near-IR region. Nd(III) was found to be the most effective at quenching the 3 MLCT luminescence of the ruthenium component because of the high density of f–f excited states of the appropriate energy which make it as effective energy-acceptor compared to Er and Yb complexes.