Visible light induced formation of a tungsten hydride complex

When irradiated with blue light in the presence of a Lewis base (L), [CpW(CO)3]2 undergoes metal–metal bond cleavage followed by a disproportionation reaction to form [CpW(CO)3L]+ and [CpW(CO)3]. Here, we show that in the presence of pyridinium tetrafluoroborate, [CpW(CO)3] reacts further to form a metal hydride complex CpW(CO)3H. The rection was monitored through in situ photo 1H NMR spectroscopy experiments and the mechanism of light-driven hydride formation was investigated by determining quantum yields of formation. Quantum yields of formation of CpW(CO)3H correlate with I−1/2 (I = photon flux on our sample tube), indicating that the net disproportionation of [CpW(CO)3]2 to form the hydride precursor [CpW(CO)3] occurs primarily through a radical chain mechanism.

Isaacs, D. P., Gruninger, C. T., Huang, T., Jordan, A. M., Nicholas, G., Chen, C.-H., ter Horst, M. A., & Dempsey, J. L. (2023). Visible light induced formation of a tungsten hydride complex. Dalton Transactions, 52(10), 3210–3218.