Contrasting Effect of Additives on Photoinduced Reactions of SmI2

Amey Nimkar, Sandeepan Maity, Robert A. Flowers, Shmaryahu Hoz

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The work described herein compares the effect of additives (HMPA, methanol, ethylene glycol, pinacol, N-methylethanolamine) on thermal and photochemical reactions of samarium diiodide (SmI2). In thermal reactions, additives that coordinate to SmI2 induce a significant increase in reaction rate. In photochemical reactions, the presence of an electronegative atom with a highly localized negative charge on the substrate leads to a rate deceleration. In order to benefit from the columbic interaction with the positively charged samarium cation, these substrates react preferentially by an inner sphere reduction mechanism. The addition of ligands prevents this close interaction causing rate retardation. Furthermore, studies demonstrate that excited state quenching of SmII by ethylene glycol and other additives indicate that it is unlikely to be the major cause for the observed rate retardation. This effect provides a simple diagnostic tool to distinguish between an inner and an outer sphere reduction mechanism.

Original languageEnglish
Pages (from-to)10499-10504
Number of pages6
JournalChemistry - A European Journal
Issue number44
StatePublished - 6 Aug 2019

Bibliographical note

Funding Information:
R.A.F. is grateful to the National Science Foundation (CHE 1565741) for support of this work. SH thanks Israel Science Foundation (grant no. 583/15) for the funding.

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


  • electron transfer
  • kinetics
  • reaction mechanism
  • reduction
  • samarium


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