Reversible photo-isomerization of: cis -[Pd(L-κ S, O)2] (HL = N, N -diethyl- N ′-1-naphthoylthiourea) to trans -[Pd(L-κ S, O)2] and the unprecedented formation of trans -[Pd(L-κ S, N)2] in solution

Henry A. Nkabyo, Barbara Procacci, Simon B. Duckett, Klaus R. Koch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Upon ex situ UV-visible light irradiation, complex cis-bis(N,N-diethyl-N′-naphthoylthioureato)-palladium(ii), cis-[Pd(L-κS,O)2], undergoes isomerization in acetonitrile-d3 and chloroform-d to yield trans-[Pd(L-κS,O)2] which then rearranges thermally to novel trans-[Pd(L-κS,N)2] prior to reverting thermally to the cis isomer in the absence of light. The thermal isomerization rate is highly solvent dependent and harnessed to enable each of these three geometric isomers to be isolated and characterized by 1H NMR spectroscopy, X-ray crystallography, melting point and thermal analysis. The formation of the trans-[Pd(L-κS,N)2] isomer as part of this isomerization has only been observed with the sterically demanding cis-bis(N,N-diethyl-N′-(naphthoylthioureato)palladium(ii) precursor based on our knowledge to date. In situ irradiation with monochromatic laser light (λ = 355 nm) coupled to 1H NMR spectroscopy of solutions of cis-[Pd(L-κS,O)2] in acetonitrile-d3 supports the ex situ photo-induced isomerization experiments.

Original languageEnglish
Pages (from-to)17241-17251
Number of pages11
JournalDalton Transactions
Issue number46
Early online date7 Nov 2019
Publication statusE-pub ahead of print - 7 Nov 2019

Bibliographical note

© The Royal Society of Chemistry 2019. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

Cite this