Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 18, 2011
Previous Article Next Article

Synthesis, structure, photophysical and electrochemiluminescence properties of Re(I) tricarbonyl complexes incorporating pyrazolyl–pyridyl-based ligands

Author affiliations

Abstract

Three rhenium carbonyl complexes 1–3 were synthesized by reaction of the appropriate bidentate pyrazolyl–pyridyl-based ligand L1, L2 (L1 = 2-[1-{4-(bromomethyl)benzyl}-1H-pyrazol-3-yl]pyridine; L2 = 1,4-bis(3-(2-pyridyl)pyrazol-1-ylmethyl)benzene) with [Re(CO)5Cl] in toluene. They were characterized by elemental analyses, ESI–MS, 1H spectroscopy, and X-ray crystallography for 1 and 2. Compounds 1–3 exhibit bright yellow–green luminescence in the solid state and in solution at 298 K with the lifetimes in the microsecond range. It is noteworthy that the luminescent quantum efficiencies of compounds 1–3 are between 0.040 and 0.051, which are much higher than that of the [Re(bpy)(CO)3Cl] complex (= 0.019) (M. M. Richter et al., Anal. Chem., 1996, 68, 4370; J. Van Houten et al., J. Am. Chem. Soc., 1976, 98, 4853). Electrogenerated chemiluminescence (ECL) was observed in solutions of these complexes in the absence or presence of coreactant tri-n-propylamine (TPrA) or 2-(dibutylamino)ethanol (DBAE) by stepping the potential of a Pt disk working electrode. The ECL spectra are identical to the photoluminescence spectra, indicating that the chemical reactions following electrochemical oxidation or reduction form the same 3MLCT excited states as that generated in the photoluminescence experiments. In most cases, the ECL quantum efficiencies of complexes 1–3 are comparable to that of the [Re(L)(CO)3Cl] (L = bpy or phen) system. Oxygen tends to substantially decrease ECL intensities of the three rhenium complexes–TPrA system, which could allow them to be used as oxygen sensors.

Graphical abstract: Synthesis, structure, photophysical and electrochemiluminescence properties of Re(i) tricarbonyl complexes incorporating pyrazolyl–pyridyl-based ligands

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 05 Jan 2011, accepted on 02 Mar 2011 and first published on 31 Mar 2011


Article type: Paper
DOI: 10.1039/C1DT00015B
Citation: Dalton Trans., 2011,40, 5078-5085
  •   Request permissions

    Synthesis, structure, photophysical and electrochemiluminescence properties of Re(I) tricarbonyl complexes incorporating pyrazolyl–pyridyl-based ligands

    Q. Wei, F. Xiao, L. Han, S. Zeng, Y. Duan and G. Chen, Dalton Trans., 2011, 40, 5078
    DOI: 10.1039/C1DT00015B

Search articles by author