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Université de Fribourg

A magnetic iron(III) switch with controlled and adjustable thermal response for solution processing

Gandolfi, Claudio ; Morgan, Grace G. ; Albrecht, Martin

In: Dalton Transactions, 2012, vol. 41, no. 13, p. 3726-3730

Spin crossover requires cooperative behavior of the metal centers in order to become useful for devices. While cooperativity is barely predictable in solids, we show here that solution processing and the covalent introduction of molecular recognition sites allows the spin crossover of iron(III) sal₂trien complexes to be rationally tuned. A simple correlation between the number of molecular...

Université de Fribourg

Polyoxometalate-based N-heterocyclic carbene (nhc) complexes for palladium-mediated C-C coupling and chloroaryl dehalogenation catalysis

Berardi, Serena ; Carraro, Mauro ; Iglesias, Manuel ; Sartorel, Andrea ; Scorrano, Gianfranco ; Albrecht, Martin ; Bonchio, Marcella

In: Chemistry, A European Journal, 2010, vol. 16, no. 35, p. 10662–10666

Better together: A novel hybrid N-heterocyclic carbene (NHC) palladium complex, integrating a totally inorganic and polyanionic decatungstate unit, has been synthesized following a convergent strategy. The interplay of the Pd binding domains with the inorganic scaffold is instrumental in accessing multi-turnover catalysis in C-C cross-coupling and aromatic dehalogenation reactions under...

Université de Fribourg

Organization of spin- and redox-labile metal centers into Langmuir and Langmuir–Blodgett films

Gandolfi, Claudio ; Miyashita, Naoko ; Kurth, Dirk G. ; Martinho, Paulo N. ; Morgan, Grace G. ; Albrecht, Martin

In: Dalton Transactions, 2010, vol. 39, p. 4508-4516

New sal₂(trien) ligands that contain alkoxy substituents of various length in meta position of the phenolate entities were coordinated to electronically and magnetically active iron(III) and cobalt(III) centers. The electrochemical and spectroscopic properties of these amphiphilic complexes are virtually unaffected upon alteration of the alkoxy substituents, thus providing a system...

Université de Fribourg

Chelating NHC ruthenium(II) complexes as robust homogeneous hydrogenation catalysts

Gandolfi, Claudio ; Heckenroth, Marion ; Neels, Antonia ; Laurenczy, Gbor ; Albrecht, Martin

In: Organometallics, 2009, vol. 28, no. 17, p. 5112–5121

A series of ruthenium(II) complexes have been prepared by using bidentate chelating N-heterocyclic carbene (NHC) ligands that feature different donor groups E (E = olefin, thioether, carboxylate, and NHC). Rigid coordination of all donor sites was concluded from NMR spectroscopy, and the electronic impact of the donor group was evaluated by electrochemical analyses. The chelating donor group had...