Issue 73, 2016

Near-infrared luminescence of Nd3+ and Yb3+ complexes using a polyfluorinated pyrene-based β-diketonate ligand

Abstract

A new polyfluorinated β-diketonate ligand containing a pyrene chromophore, namely, 4,4,5,5,6,6,6-heptafluoro-3-hydroxy-1-(pyren-1-yl)hex-2-en-1-one (Hhfpyr) has been designed and employed for the development of a series of near-infrared (NIR) emitting lanthanide complexes (Nd3+ and Yb3+) in the absence and presence of an ancillary ligand, 4,7-diphenyl-1,10-phenanthroline (bath). The isolated NIR-emitting lanthanide complexes [Nd(hfpyr)3(H2O) 1, Nd(hfpyr)3(bath) 2, Yb(hfpyr)3(H2O) 3 and Yb(hfpyr)3(bath) 4] have been characterized by various spectroscopic techniques and evaluated their photoluminescence properties. The photophysical properties disclosed that the developed pyrene-based β-diketonate ligand is well suited for the sensitization of Nd3+ as well as Yb3+ emissions, thanks to the favourable position of the triplet state (T1) of the ligand (ΔE = T14F3/2 = 4700 cm−1 for Nd3+ and ΔE = T12F5/2 = 6200 cm−1 for Nd3+), as evidenced from the phosphorescence spectra of the corresponding Gd3+ complexes. Most importantly, the displacement of solvent molecules from the coordination sphere of the NIR emitting lanthanide binary complexes (1 and 3) with an ancillary ligand markedly enhances the quantum yields (Φoverall = 0.45 for 1 to 1.07% for 2 and from 1.69 for 3 to 3.08% for 4) and excited state lifetime values (τ = 2.80 for 1 to 6.16 μs for 2 and from 6.88 for 3 to 13.45 μs for 4). Notably, Yb3+ ternary compound 4 with promising NIR luminescence properties was embedded into PMMA matrices, giving rise to a series of PMMA-supported hybrid materials (PMMA@4), where the thermal stability and the film-forming properties were significantly enhanced.

Graphical abstract: Near-infrared luminescence of Nd3+ and Yb3+ complexes using a polyfluorinated pyrene-based β-diketonate ligand

Supplementary files

Article information

Article type
Paper
Submitted
11 Мам. 2016
Accepted
17 Шіл. 2016
First published
18 Шіл. 2016

RSC Adv., 2016,6, 69509-69520

Near-infrared luminescence of Nd3+ and Yb3+ complexes using a polyfluorinated pyrene-based β-diketonate ligand

T. M. George, S. Varughese and M. L. P. Reddy, RSC Adv., 2016, 6, 69509 DOI: 10.1039/C6RA12220E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements