Solutions of complex copper salts in low-transition-temperature mixture (LTTM)

Abstract

The structure and properties of diethanolamine complexes of copper(II) triflates dissolved in an excess of diethanolamine (DH₂) were studied. The copper containing substance was found to be a solution of copper(II) complex salt [Cu²⁺DH₂(DH⁻)]OTf⁻ in LTTM composition [(DH₂)₄H⁺](OTf⁻), where LTTM = low-transition-temperature mixture, OTf⁻ = triflate anion. According to the EXAFS data, the coordination number of copper(II) atoms in solution does not exceed four. Addition of even negligible amounts of acid significantly changes DH₂ volatility and decomposition conditions.