Microsecond Photoluminescence and Photoreactivity of a Metal-Centered Excited State in a Hexacarbene-Co(III) Complex

Summary, in English

The photofunctionality of the cobalt-hexacarbene complex [Co(III)(PhB(MeIm)3)2]+ (PhB(MeIm)3 = tris(3-methylimidazolin-2-ylidene)(phenyl)borate) has been investigated by time-resolved optical spectroscopy. The complex displays a weak (φ ∼10-4) but remarkably long-lived (τ ∼1 μs) orange photoluminescence at 690 nm in solution at room temperature following excitation with wavelengths shorter than 350 nm. The strongly red-shifted emission is assigned from the spectroscopic evidence and quantum chemical calculations as a rare case of luminescence from a metal-centered state in a 3d6 complex. Singlet oxygen quenching supports the assignment of the emitting state as a triplet metal-centered state and underlines its capability of driving excitation energy transfer processes.

• Author: Simon Kaufhold; Nils W. Rosemann; Pavel Chábera; Linnea Lindh; Iria Bolanõ Losada; Jens Uhlig; Torbjörn Pascher; Daniel Strand; Kenneth Wärnmark; Arkady Yartsev; Petter Persson
• Department/s: Centre for Analysis and Synthesis; Chemical Physics; NanoLund: Centre for Nanoscience; eSSENCE: The e-Science Collaboration; Computational Chemistry
• Publishing year: 2021
• Language: English
• Pages: 1307-1312
• Publication/Series: Journal of the American Chemical Society
• Links: http://dx.doi.org/10.1021/jacs.0c12151
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Physical Chemistry (including Surface- and Colloid Chemistry); Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0002-7863