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In this work, we have prepared and characterized some gold compounds wearing a N-heterocyclic carbene (NHC) ligand as well as alkynyl derivatives with different substituents. The study of their electrochemical behavior reveals that these complexes show an irreversible wave at potentials ranging between −2.79 and −2.91 V, referenced to the ferrocenium/ferrocene pair. DFT calculations indicate that the reduction occurs mainly on the aryl−C≡C fragment. The cyclic voltammetry experiments under CO2 atmosphere show an increase in the faradaic current of the reduction wave compared to the experiments under argon atmosphere, indicating a possible catalytic activity towards the carbon dioxide reduction reaction (CO2RR). [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • First report of a MW assisted syntheses of a ligands and its complexes. • All the reactions are carried out MW assisted, with high yields. • The characterization of the complexes includes photophysics and electrochemistry. • The complexes are phosphorescent. • Complete spectroscopic characterization also for starting materials. Abstract The synthesis of 3-(2pyridyl)pyrazole (pypzH) by conventional methods requires refluxing at high temperatures during more than 16 h, but this is reduced to two consecutive steps of 2 h at 100 °C, and of 10 min at 50 °C in a microwave (MW) assisted synthesis. Its coordination as chelating ligand to the " fac -ReIBr(CO) 3 " and "RuII(bipy) 2 " fragments also occurs MW assisted in 5 or 10 min, respectively. A new MW assisted synthetic method is also described for the synthesis of the starting material [Ru(bipy) 2 Cl 2 ]·2H 2 O. Both pypzH complexes are characterized by X-ray crystallography, and the study of their photophysical properties support their phosphorescence. The electrochemistry of the Ru complex indicates that electrochemical oxidation is followed by a chemical process. [ABSTRACT FROM AUTHOR]