Catalysis is a fascinating opportunity for chemists to unbolt new reaction pathways in mild conditions. Among promising fields of catalysis, photoredox catalysts have shown good reactivity. However, mostly-used photocatalysts are still mainly based on precious metals such as iridium and ruthenium. Efforts to develop more abundant metals photoactive complexes brought some examples using iron,...
Le protactinium connaît actuellement un regain d’intérêt en raison d’une application potentielle dans différents domaines en marge du nucléaire civil (réacteur à combustible thorium, accumulation de 231Pa dans les résidus miniers d’uranium) : détermination du rapport 231Pa/230Th en océanographie et du rapport 231Pa/235U en criminalistique nucléaire ou géochronologie, irradiation de 231Pa ou...
The transition from the exploitation of fossil fuels to the efficient use of sustainable energies is the main goal of the researchers of the 21st century. Hydrogen has emerged as a clean fuel alternative to fossil energies, due to its absence of carbon dioxide emission when used. [1]
However, the production of green hydrogen has been very challenging and is today a focus of the scientific...
The cyclonatetraenyl (Cnt) anion is nine-membered ring that was first synthesize in 1963 by Katz and Garrat.1 This compounds features two isomers: the cis,cis,cis,cis- Cnt and the cis,cis,cis,trans-Cnt as depicted in Figure 1. At that time, scientist observed spontaneous isomerization from the trans form to the cis one. Given the aromatic character of the fully cis form, it was considered the...
Divalent lanthanide complexes are attractive single-electron reductants as their reactivity can be tuned by the nature of both the Ln(II) metal centre and the ligand. In this context, Ln(II) complexes have been actively investigated for the activation and transformation of small molecules. In particular, homogeneous complexes allowing the activation and valorisation of CO under mild conditions...
Aromatic ligands have provided a wealth of interesting organometallic complexes of f-elements, namely featuring cyclopentadienyl (Cp, C5H5-) or cyclooctatetraenyl (Cot, C8H82-) frameworks.[1,2] In recent years, this area has been expanded to include the cyclononatetraenyl (Cnt, C9H9-) ligand, which exhibits unique coordination modes to late lanthanide centres of the general form Ln(Cnt)3 (Ln...
Résumé: Developed in the 1980s, dendrimer chemistry has opened up new perspectives in fields as diverse as catalysis, molecular electronics and artificial photosynthesis.[1] Surprisingly, however, magnetic dendrimers are not common in the literature due to puzzling difficulties in their synthesis and characterization.[2] In this context, the design of such multimetallic and monodisperse...
The chemistry of organometallic palladium complexes is largely dominated by the 0 and +II metal’s oxidation states due to their central relevance in cross-coupling transformations.[1] However, higher oxidations states of the metal are being explored in the effort to access previously precluded transformations and to unveil unprecedented reactivity at the metal centre.[2,3]
The coordination of...
