Issue 46, 2015

A new class of deep-blue emitting Cu(i) compounds – effects of counter ions on the emission behavior

Abstract

Three deep blue emitting Cu(I) compounds, [Cu(PPh3)tpym]PF6, [Cu(PPh3)tpym]BF4, and [Cu(PPh3)tpym]BPh4 (tpym = tris(2-pyridyl)methane, PPh3 = triphenylphosphine) featuring the tripodally coordinating tpym and the monodentate PPh3 ligands were studied with regard to their structural and photophysical properties. The compounds only differ in their respective counter ions which have a strong impact on the emission properties of the powder samples. For example, the emission quantum yield can be significantly increased for the neat material from less than 10% to more than 40% by exchanging BPh4 with PF6. These effects can be linked to different molecular packings which depend on the counter ion. In agreement with these results, it was found that the emission properties also strongly depend on the surrounding matrix environment which was elucidated by investigating photophysical properties of the compounds as powders, doped into a polymer matrix, and dissolved in a fluid solution, respectively. The observed differences in the emission behavior can be explained by different and pronounced distortions that occur in the excited state. These distortions are also displayed by density functional theory (DFT) calculations.

Graphical abstract: A new class of deep-blue emitting Cu(i) compounds – effects of counter ions on the emission behavior

Supplementary files

Article information

Article type
Paper
Submitted
08 Aug 2015
Accepted
09 Oct 2015
First published
09 Oct 2015
This article is Open Access
Creative Commons BY license

Dalton Trans., 2015,44, 20045-20055

A new class of deep-blue emitting Cu(I) compounds – effects of counter ions on the emission behavior

T. Gneuß, M. J. Leitl, L. H. Finger, H. Yersin and J. Sundermeyer, Dalton Trans., 2015, 44, 20045 DOI: 10.1039/C5DT03065J

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