Photoactivated linkage isomerism in single crystals of nickel, palladium and platinum di-nitro complexes: A photocrystallographic investigation

M.R. Warren, S.K. Brayshaw, L.E. Hatcher, A.L. Johnson, S. Schiffers, A.J. Warren, C.H. Woodall, P.R. Raithby, S.J. Teat, J.E. Warren

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Abstract

Low temperature, single crystal photocrystallographic studies have been carried out on four square planar Group 10 complexes Ni(PEt 3) 2(NO 2) 2] 1, [Pd(PPh 3) 2(NO 2) 2] 2, [Pd(AsPh 3) 2(NO 2) 2] 3 and [Pt(PPh 3) 2(NO 2) 2] 4 in which the two nitro groups adopt the trans configuration. Irradiation with UV light, at 100 K, of single crystals of complexes 1-3 photoisomerise from the from the η 1-NO 2 nitro form to the η 1-ONO nitrito form occurred. Complex 1 underwent 25% conversion to the nitrito form before crystal decomposition occurred. 2 and 3 underwent 46% and 39% conversion, respectively, to the nitrito form when a photostationary state was reached. While under the same experimental conditions 4 showed no isomerisation. The photocrystallographic results can be correlated with the results of DFT calculations and with the observed trends in the solution UV/visible absorption spectroscopy obtained for these complexes. The results suggest that while steric factors in the isomerization processes are important there may also be a kinetic effect relating to the lability of the metal involved.
Original languageEnglish
Pages (from-to)13173-13179
Number of pages7
JournalDalton Transactions
Volume41
Issue number42
DOIs
Publication statusPublished - 14 Nov 2012

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