Complete Ag4M2(DMSA)4 (M = Ni, Pd, Pt, DMSA = Dimercaptosuccinic Acid) Cluster Series: Optical Properties, Stability, and Structural Characterization

Scott R. Biltek, Arthur C. Reber, Shiv N. Khanna, Ayusman Sen

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Abstract

The cluster series Ag4M2(DMSA)4 (M = Ni, Pd, Pt) has been synthesized and the optical spectra and stability have been examined as a function of the metal, M. We have also obtained the structure of Ag4Ni2(DMSA)4 using X-ray crystallography, confirming the previously calculated structure. In the optical spectrum, there is a significant blue shift as the substituted metal M progresses down the periodic table. Theoretical calculations suggest that the blue shift is due to the lowering in energy of the d orbitals of the transition metal, M; however the expected metal-metal excitations are optically weak, and the spectra are dominated by metal-ligand excitations. The Ag4Pd2(DMSA)4 species has exceptionally high stability relative to the previously reported Ni and Pt analogues.

Original languageEnglish (US)
Pages (from-to)5324-5331
Number of pages8
JournalJournal of Physical Chemistry A
Volume121
Issue number28
DOIs
StatePublished - Jul 20 2017

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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