Síntesi de complexos de ruteni amb lligands heterocíclics de tipus N- i C- donors per a processos catalítics d'acoblament d'alcohols
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During this final degree project, different synthetic routes have been carried out with the aim of
obtaining new ruthenium complexes with different types of ligands. The set of syntheses
performed have a common objective of preparing compounds capable of catalyzing alcohol
coupling reactions.
Five ruthenium compounds have been synthesized. Compound [1], [RuCl2(dmso)4], was
synthesized from RuCl3 and dimethylsulfoxide by refluxing. Once this complex is obtained, the
second synthesis is carried out, where [1] reacts with the previously synthesized ligand bpea to
form cis,fac-[RuCl2(bpea)(dmso)], compound [2]. On the other hand, [RuCl3(bpea)], compound
[3], has been synthesized from RuCl3·2.53H2O and the ligand bpea. Both compound [2] and
compound [3] are precursor complexes of compound [4], trans,fac-[RuCl(Cb-Me)(bpea)] (PF6),
which can be obtained by reacting these precursors with the bidentate ligand Cb-Me under
different conditions. Finally, starting from compound [4] in an aqueous medium and adding
AgNO3, the last synthesized complex is obtained, the aquacomplex [5], trans,fac-[Ru(Cb Me)(bpea)(OH2)](PF6)2.
To characterize and study the different properties of the compounds obtained during the
synthesis, spectroscopic, spectrometric, and electrochemical techniques such as 1H-NMR, UV Vis, ESI-MS, and cyclic voltammetry have been used.
Compounds [2], [3], [4], and [5] have been evaluated as catalysts in alcohol coupling reactions,
using a primary alcohol, such as benzyl alcohol, and a secondary alcohol, such as 1-
phenylethanol. The studied catalyzes have been carried out under temperature (thermal
catalysis) or by activation with white light (photocatalysis). The coupling product has been
quantified using 1H-NMR, and the corresponding conversion percentage and turnover number
(TON) of catalytic cycles have been calculated. The effectiveness of the different complexes has
been compared by considering the different conditions and the structure or oxidation state of
the catalysts