Ligand protected, atomically-precise metal nanoclusters (NCs) are an important class of compounds that acts as a junction between molecular chemistry and material science. Among these, the most important and studied sub-class is the one of gold nanoclusters (AuNCs), as a consequence of the unique characteristics given by gold. Very recently, N-heterocyclic carbenes have been discovered as a new class of ligands that is able to stabilize metal nanoclusters, and that can confer peculiar properties to these species thanks to their high degree of tailorability. The thesis project has involved the attempted or successful synthesis of pre-ligand imidazolium and bisimidazolium salts, several Au complexes, and their attempted or successful conversion into nanoclusters by means of direct reduction and stoichiometric co-reduction. The project has also included reactions between dinuclear gold complexes and phosphine-protected clusters. When feasible, isolation and characterization of the products have been performed.
I nanocluster metallici (NCs) protetti da leganti e dotati di precisione atomica sono un'importante classe di composti al confine tra la chimica molecolare e la scienza dei materiali. Tra di loro, la più importante e studiata sottoclasse è quella dei nanocluster di oro (AuNCs), come conseguenza delle caratteristiche uniche conferite da questo metallo. Molto recentemente i carbeni N-eterociclici sono stati individuati come nuova classe di leganti capaci di stabilizzare nanocluster metallici. Essi inoltre possono conferire peculiari proprietà ai nanocluster grazie alla loro elevata versatilità. Il progetto di tesi ha coinvolto la tentata o riuscita sintesi di sali di imidazolio e bis-imidazolio (pre leganti), di diversi complessi di oro, e la loro tentata o riuscita conversione in nanocluster mediante riduzione diretta e co-riduzione stechiometrica. Il progetto ha anche incluso reazioni tra complessi dinucleari di oro e cluster protetti da fosfine. Quando possibile, sono stati svolti l'isolamento e la caratterizzazione dei prodotti.
Strategie di sintesi per cluster molecolari di oro stabilizzati da carbeni N-eterociclici
FILIPPETTO, MASSIMO
2021/2022
Abstract
Ligand protected, atomically-precise metal nanoclusters (NCs) are an important class of compounds that acts as a junction between molecular chemistry and material science. Among these, the most important and studied sub-class is the one of gold nanoclusters (AuNCs), as a consequence of the unique characteristics given by gold. Very recently, N-heterocyclic carbenes have been discovered as a new class of ligands that is able to stabilize metal nanoclusters, and that can confer peculiar properties to these species thanks to their high degree of tailorability. The thesis project has involved the attempted or successful synthesis of pre-ligand imidazolium and bisimidazolium salts, several Au complexes, and their attempted or successful conversion into nanoclusters by means of direct reduction and stoichiometric co-reduction. The project has also included reactions between dinuclear gold complexes and phosphine-protected clusters. When feasible, isolation and characterization of the products have been performed.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/30685