Photophysical properties of near-infrared-emitting Ln(III) complexes with 1-(9-Anthryl)-4,4,4-trifluoro-1,3-butandione (Ln = Nd and Er).
We report the synthesis and photophysical properties of Nd(III) and Er(III) complexes with 1-(9-anthryl)-4,4,4-trifluoro-1,3-butandione (9-ATFB). The complexes of [Nd(9-ATFB)4]- and [Er(9-ATFB)4]- produced sensitized near-infrared (NIR) luminescence via the excitation of anthracene. This suggests that the intramolecular energy transfer occurred from the singlet excited state of anthracene to the resonance levels of the metal ions, since the phosphorescence of anthracene is forbidden under normal conditions. The observed quantum yield of the visible luminescence showed that the energy transfer is more efficient for [Nd(9-ATFB)4]- than for [Er(9-ATFB)4]-. The lifetimes of the NIR luminescence of the complexes were in the microsecond range. The quantum yields of the sensitized NIR of the complexes were estimated using the lifetime and the energy-transfer quantum yield.
Nah
Min-Kook
MK
Department of Chemistry, Chungnam National University, Daejeon 304-764, Korea.
Cho
Hyung-Gook
HG
Kwon
Hyun-Jung
HJ
Kim
Yeong-Joon
YJ
Park
Changmoon
C
Kim
Hwan Kyu
HK
Kang
Jun-Gill
JG
D000873:Anthracenes / Q000737:chemistry*; D004735:Energy Transfer; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010777:Photochemistry; D011789:Quantum Theory; D012680:Sensitivity and Specificity; D013053:Spectrophotometry; D019265:Spectroscopy, Near-Infrared / Q000379:methods
C522712:1-(9-anthryl)-4,4,4-trifluoro-1,3-butandione; D000873:Anthracenes; D028581:Lanthanoid Series Elements; D049408:Luminescent Agents; D009942:Organometallic Compounds