Exploring the Limits of High Potential Oxidizers Prediction, Validation and Preparation of Unusual Molecules at the Edge of Stability

Informations projet

HighPotOx

N° de convention de subvention: 818862

DOI

10.3030/818862

Projet clôturé

Date de signature de la CE 18 Février 2019

Date de début 1 Janvier 2020

Date de fin 31 Decembre 2025

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 1 988 280,00

Contribution de l’UE

€ 1 988 280,00

Coordonné par

FREIE UNIVERSITAET BERLIN
Germany

Periodic Reporting for period 3 - HighPotOx (Exploring the Limits of High Potential OxidizersPrediction, Validation and Preparation of Unusual Molecules at the Edge of Stability)

Période du rapport: 2023-01-01 au 2024-06-30

Résumé du contexte et des objectifs généraux du projet

Unusual species show unusual reactivity! The HighPotOx project aims at the prediction, validation as well as molecular isolation and bulk preparation of high to extreme potential oxidizers, which in most cases correlate with their existence in high oxidation states. That is why both aspects cannot be studied independently. However, additional factors unrelated to a physical oxidation state influence the oxidizing strength. As known, the electron affinity, which can be used as a scale for the oxidizing strength, increases from its anionic via neutral to the cationic nature of the compounds, while their oxidation state remains constant. Furthermore, the acidity of the solvent also plays a key role in synthetic strategies. Basic solvents prefer the formation of anions, while an acidic environment leads to the stabilization of cations. Keeping this concept in mind, it will be more advantageous to investigate and stabilize bulk quantities of compounds in extreme oxidation states in their neutral or anionic form. The formation of cations is undoubtedly more challenging.
Due to their potential interest and due to their industrial applications, the HighPotOx project aims as well at the investigation of oxygen-containing potential oxidizers and their oxidation states. Its bonding characteristic to the central atom can be characterized, e.g. based on vibrational spectroscopy and quantum-chemical methods.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

The ERC project HighPotOx investigated a plethora of new fundamental oxidizers via matrix-isolation spectroscopy in conjunction with quantum-chemical methods such as CN+, MF6, HgO3 to mentioned only a few. One of the fundamental achievements in this series is the discovery and characterization of a new oxidation state of rhodium in Rh(VII)O3+. This new species is also expected to be a potential strong oxidizer. Further scientific achievements have been made by bulk preparation. The application of the polychloride ionic liquid as oxidizing reagent to prepare the so far unknown and surprising [SCl6]2- dianion is one of the highligths. A further achievement is the synthesis and characterization of the perfluorinated trityliumion. Which can now be prepared in larger quantities and can be handled at room temperature. This novel oxidizer will be a useful reagent in further chemistry applications. represents a breakthrough into a possible synthetic chemistry of the so far unknown transition metal ozonides and perhaps a new class of compounds with surprising properties.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

In the HighPotOx project we propose to combine different techniques to systematically investigate high potential fluorinated and non-fluorinated oxidizers as well as molecular species bearing elements in high oxidation states. The results, which we gain by a combination of sophisticated experimental and theoretical methods will guide us in the discovery of new trends and concepts towards an understanding of prototype problems encountered with high potential oxidants at the frontiers of chemistry.

Structure of the HighPotOx project