125-Tellurium and 77-selenium multinuclear magnetic resonance studies of Te64+, Te4–nSen2+, Te2Se42+, and Te3Se32+ polyatomic cations

Abstract

High-resolution ¹²⁵Te and ⁷⁷Se Fourier transform n.m.r. spectroscopy has been used to characterize the previously known Te₆⁴⁺, Te₄²⁺, Se₄²⁺, and Te₂Se₄²⁺ cations for the first time and several new mixed species in the +1/2 (Te₃Se²⁺, cis- and trans-Te₂Se₂²⁺, and TeSe₃²⁺) and +1/3 (Te₃Se₃²⁺) oxidation states; the ¹²⁵Te^–123Te, ¹²⁵Te–⁷⁷Se, and ⁷⁷Se–⁷⁷Se spin–spin couplings have been observed in both natural abundance and 94·4%⁷⁷Se enriched preparations and used to assign the structures.