Prof. Dr. Roger Alberto - A Special Collection of articles honouring an outstanding scientist, collaborator, and friend.
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Rhenium(I) and technetium(I) complexes with megazol derivatives: towards the development of a theranostic platform for Chagas disease.
Dalton Trans
December 2024
Bioactive Compounds Development Research Group, Federal University of Triângulo Mineiro, Av. Dr. Ran-dolfo Borges 1400, Uberaba 38025-440, MG, Brazil.
The diagnosis and treatment of Chagas disease (CD) in the chronic phase remains a challenge. With that in mind, a potential theranostic device based on the trypanocidal agent known as megazol and the -M(CO) (M = Re or Tc) fragment is proposed in the present work. The peripheral structure of megazol (L) was modified to obtain the compounds L (R1 = H, R2 = Me and R1 = R2 = Me), which were used in the syntheses of complexes of composition [ReBr(CO)L].
View Article and Find Full Text PDFSynthesis, Characterization, and Biological Evaluation of Novel [M(η-arene)] (M = Re, Tc) Hosted Terpyridines and Copper Complexes Thereof.
Inorg Chem
September 2024
University of Zurich, Department of Chemistry, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
We report the synthesis, characterization, and in vitro biological activities of [Re(η-arene)]-terpyridine conjugates and their Cu complexes. The terpyridine (terpy) chelators were attached to the [Re(η-arene)] scaffold via secondary amine linkers allowing for heteroleptic mono- and homoleptic bis-terpyridine-substituted chelators. Complexation with CuCl afforded the respective square pyramidal [Cu(terpy)Cl] complexes hosted on the [Re(η-arene)] scaffold.
View Article and Find Full Text PDFDirect Anchoring of Molybdenum Sulfide Molecular Catalysts on Antimony Selenide Photocathodes for Solar Hydrogen Production.
ACS Energy Lett
August 2024
Department of Chemistry, University of Zurich, Zurich, 8057, Switzerland.
Molybdenum sulfide serves as an effective nonprecious metal catalyst for hydrogen evolution, primarily active at edge sites with unsaturated molybdenum sites or terminal disulfides. To improve the activity at a low loading density, two molybdenum sulfide clusters, [MoS] and [MoS], were investigated. The MoS molecular catalysts were heterogenized on SbSe with a simple soaking treatment, resulting in a thin catalyst layer of only a few nanometers that gave up to 20 mA cm under one sun illumination.
View Article and Find Full Text PDFOptimizing Photocatalytic H Production by Introduction of Pyrazinyls to WRCs and a New tris-Rhenium Photosensitizer.
Chemistry
August 2024
Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Switzerland.
Article Synopsis
- - The study demonstrates that replacing pyridyl with pyrazinyl in cobalt water reducing catalysts leads to more positive reduction potentials.
- - The new combination with a trinuclear Re photosensitizer results in significantly enhanced photocatalytic performance, achieving up to 65 kTONs at a minimal catalyst concentration.
- - One of the catalysts shows impressive stability under electrocatalytic conditions, consistently producing hydrogen over 21 days in DMF and 14 days in HO.
Light-Driven Ring Slippage in [Re(η-CH)(η-CH)] and the Inertness of Its Technetium Homologue.
Inorg Chem
February 2024
Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland.
Here, we present the light-driven reactions of [Re(η-CH)(η-CH)] () with nitriles, phosphines, and isocyanides, which are added to via a ring slippage of the tropylium cation from η to η, forming [Re(η-CH)(η-CH)(L)] (L= acetonitrile ; 2-phenylacetonitrile ; 1,3,5-triaza-5-phosphoadamantane (PTA) ; -butyl isocyanide ; benzyl isocyanide ) and [Re(η-CH)(η-CH)(L)] with L = (ethane-1,2-diyl)bis(diphenylphosphane) (dppe) . To compare the reactivities of rhenium and technetium, we also investigated the synthesis of [Tc(η-CH)], its substitution of naphthalene with cyclohepta-1,3,5-triene to obtain [Tc(η-CH)(η-CH)], and its reactivity (or lack thereof) with light.
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