An Ir(IV)-containing polyoxometalate.

Sergey A Adonin,Paul Kögerler,Natalya V Izarova,Claire Besson,Pavel A Abramov,Maxim N Sokolov,Beatrix Santiago-Schübel,Vladimir P Fedin

doi:10.1039/c4cc09271f

Abstract

[HIr(IV)W6O24](7-), representing the first Ir-containing Anderson-Evans-type polyanion and the first structurally characterized Ir(IV)-based polyoxometalate, has been isolated as its hydrated sodium salt and characterized by single-crystal X-ray diffraction, mass spectrometry, and IR, UV-Vis and EPR spectroscopy. Cyclic voltammetry indicates that the Ir(IV) ions in [HIrW6O24](7-) can undergo reversible one-electron reduction and oxidation, resulting in Ir(III) and Ir(V) derivatives.

Highlights

Cyclic voltammetry indicates that the IrIV ions in [HIrW6O24]7À can undergo reversible one-electron reduction and oxidation, resulting in IrIII and IrV derivatives
We report the preparation of [HIrIVW6VIO24]7À (IrW), the first polyoxometalate incorporating IrIV, and its characterization by single-crystal X-ray analysis, mass spectrometry, IR, UV-Vis and EPR spectroscopy, as well as cyclic voltammetry
Heating of the solution led to a gradual color change from brown-green to blue and to purple

Summary

Introduction

[HIrIVW6O24]7À, representing the first Ir-containing Anderson– Evans-type polyanion and the first structurally characterized IrIV-based polyoxometalate, has been isolated as its hydrated sodium salt and characterized by single-crystal X-ray diffraction, mass spectrometry, and IR, UV-Vis and EPR spectroscopy. We report the preparation of [HIrIVW6VIO24]7À (IrW), the first polyoxometalate incorporating IrIV, and its characterization by single-crystal X-ray analysis, mass spectrometry, IR, UV-Vis and EPR spectroscopy, as well as cyclic voltammetry.

Results

Conclusion