Issue 17, 2025

Decomposition of organometallic precursor tricarbonyl(trimethylenemethane)ruthenium Ru(C4H6)(CO)3+/0 in the gas phase investigated by thermal desorption spectrometry

Abstract

Thermal decomposition of an organometallic precursor Ru(C4H6)(CO)3+/0 was observed using gas-phase thermal desorption spectrometry. It was found that the CO ligands were readily released, forming Ru(C4H6)+ at 600 K. Then, Ru(C4H4)+ and Ru(C2H2)+ were produced as a result of sequential H2 and C2H2 release above 800 K. The activation energies of the ligand losses were estimated from the temperature dependences, and were consistent with the available internal energies obtained by DFT calculations. Based on experimental and computational results, Ru(C4H4)+ was identified as a ruthenium complex with unsubstituted cyclobutadiene, [η4-(C4H4)Ru]+. For the thermal decomposition of neutral Ru(C4H6)(CO)3, the appearance of photoionized Ru(C4H6)(CO) is evidence of CO loss from Ru(C4H6)(CO)2 at 740 K. The decomposition further proceeds above 800 K, forming Ru(C4H6).

Graphical abstract: Decomposition of organometallic precursor tricarbonyl(trimethylenemethane)ruthenium Ru(C4H6)(CO)3+/0 in the gas phase investigated by thermal desorption spectrometry

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Article information

Article type
Paper
Submitted
15 led 2025
Accepted
08 dub 2025
First published
08 dub 2025
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2025,27, 9244-9251

Decomposition of organometallic precursor tricarbonyl(trimethylenemethane)ruthenium Ru(C4H6)(CO)3+/0 in the gas phase investigated by thermal desorption spectrometry

K. Miyajima, T. Nagata, F. Mafuné, T. Tsugawa and R. Harada, Phys. Chem. Chem. Phys., 2025, 27, 9244 DOI: 10.1039/D5CP00200A

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