Unravelling the photochemical transformations of chromium(I) 1,3 Bis(diphenylphosphino), [Cr(CO)4(dppp)]+, by EPR spectroscopy

Luckham, Stephen L. J., Folli, Andrea ORCID: https://orcid.org/0000-0001-8913-6606, Platts, James A. ORCID: https://orcid.org/0000-0002-1008-6595, Richards, Emma ORCID: https://orcid.org/0000-0001-6691-2377 and Murphy, Damien M. ORCID: https://orcid.org/0000-0002-5941-4879 2019. Unravelling the photochemical transformations of chromium(I) 1,3 Bis(diphenylphosphino), [Cr(CO)4(dppp)]+, by EPR spectroscopy. Organometallics 38 (12) , -. 10.1021/acs.organomet.9b00226

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Abstract

UV-induced photochemical transformations of the paramagnetic [Cr(CO)4(Ph2PCH2CH2CH2PPh2)]+ complex (abbreviated [Cr(CO)4(dppp)]+) in dichloromethane was investigated by CW EPR spectroscopy. Room-temperature UV irradiation results in the rapid transformation of [Cr(CO)4(dppp)]+ into trans-[Cr(CO)2(dppp)2]+. However, low-temperature (77–120 K) UV irradiation reveals the presence of an intermediate mer-[Cr(CO)3(κ1-dppp)(κ2-dppp)]+ complex which photochemically transforms into trans-[Cr(CO)2(dppp)2]+. The derived spin Hamiltonian parameters for these complexes were confirmed by DFT calculations. The photoinduced reaction is shown to be concentration-dependent, leading to a distribution of the three complexes ([Cr(CO)4(dppp)]+, mer-[Cr(CO)3(κ1-dppp)(κ 2-dppp)]+, and trans-[Cr(CO)2(dppp)2]+). A bimolecular photoinduced mechanism is proposed to account for the formation of mer-[Cr(CO)3(κ1-dppp)(κ2-dppp)]+ and trans-[Cr(CO)2(dppp)2]+.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Advanced Research Computing @ Cardiff (ARCCA)
Publisher:	American Chemical Society
ISSN:	0276-7333
Funders:	EPSRC
Date of First Compliant Deposit:	18 June 2019
Date of Acceptance:	29 May 2019
Last Modified:	16 Oct 2024 10:20
URI:	https://orca.cardiff.ac.uk/id/eprint/123541

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