Synthesis and solution multinuclear magnetic resonance studies of homoleptic copper(I) complexes of sulfur, selenium and tellurium donor ligands

Abstract

The complexes [CuL₄][O₃SCF₃](L = Me₂S, Me₂Se, Me₂Te, Ph₂S, Ph₂Se or Ph₂Te) and [Cu(L–L)₂]PF₆[L–L = RE(CH₂)₂ER (E = S or Se, R = Me or Ph); RE(CH₂)₃ER (E = S, Se or Te; R = Me or Ph)] have been prepared and characterised by analysis, IR, and in particular multinuclear NMR spectroscopy (¹H, ⁷⁷Se, ¹²⁵Te and ⁶³Cu). Variable-temperature NMR studies have been used to probe various exchange processes occurring in solution. For a limited number of complexes ⁶³Cu NMR resonances have been observed, the first examples from Group 16 donor complexes.