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Université de Fribourg

Solid-state structure and anti­microbial and cytotoxicity studies of a cucurbit[6]uril-like Cu6L4 constructed from 3,5-bis­[(1H-tetra­zol-5-yl)meth­yl]-4H-1,2,4-triazol-4-amine

Vasylevskyi, Serhii ; Holzheu, Anja ; Fromm, Katharina M.

In: Acta Crystallographica Section C: Structural Chemistry, 2018, vol. 74, no. 11, p. 1413–1419

3,5-Bis[(1H-tetra­zol-5-yl)meth­yl]-4H-1,2,4-triazol-4-amine (H2L) associates under deprotonation with CuSO4 in aqueous medium to form a new waisted barrel-shaped M6L4 cluster, namely hexa­aqua­tetra­kis­{μ4-3,5-bis­[(1H-tetra­zol-5-yl)meth­yl]-4H-1,2,4- triazol-4-amine}-μ4-sulfato-hexa­copper(II) sulfate hydrate, [Cu6(SO4) (C6H6N12)4(H2O)6]SO4·nH2O (n = ∼23) (1). Cluster 1...

Université de Fribourg

Beyond global charge: role of amine bulkiness and protein fingerprint on nanoparticle–cell interaction

Burnand, David ; Milosevic, Ana ; Balog, Sandor ; Spuch-Calvar, Miguel ; Rothen-Rutishauser, Barbara ; Dengjel, Jörn ; Kinnear, Calum ; Moore, Thomas L. ; Petri-Fink, Alke

In: Small, 2018, vol. 14, no. 46, p. 1802088

Amino groups presented on the surface of nanoparticles are well‐known to be a predominant factor in the formation of the protein corona and subsequent cellular uptake. However, the molecular mechanism underpinning this relationship is poorly defined. This study investigates how amine type and density affect the protein corona and cellular association of gold nanoparticles with cells in...

Université de Fribourg

Mononuclear silver(I) complexes with 1,7-phenanthroline as potent inhibitors of Candida growth

Savić, Nada D. ; Vojnovic, Sandra ; Glišić, Biljana Đ. ; Crochet, Aurélien ; Pavic, Aleksandar ; Janjić, Goran V. ; Pekmezović, Marina ; Opsenica, Igor M. ; Fromm, Katharina M. ; Nikodinovic-Runic, Jasmina ; Djuran, Miloš I.

In: European Journal of Medicinal Chemistry, 2018, vol. 156, p. 760–773

Mononuclear silver(I) complexes with 1,7-phenanthroline (1,7-phen), [Ag(NO3-O,O′) (1,7-phen-N7)2] (1) and [Ag(1,7-phen-N7)2]X, X = ClO4− (2), CF3SO3− (3), BF4− (4) and SbF6− (5) were synthesized and structurally characterized by NMR (1H and 13C), IR and UV–Vis spectroscopy and ESI mass spectrometry. The crystal structures of 1, 3 and 4 were determined by single-crystal X-ray...

Université de Fribourg

Heptacoordinate Co(II) catalyst for light-driven hydrogen production in fully aqueous medium

Lucarini, Fiorella ; Ruggi, Albert

In: CHIMIA International Journal for Chemistry, 2018, vol. 72, no. 4, p. 203–206

Photocatalytic hydrogen production is an appealing way to store solar energy as chemical fuel. The most studied molecular catalysts for H2 production are based on earth-abundant metals such as Ni, Co and Fe. Efforts have been recently focused on the design of Co complexes with distorted octahedral geometries induced by tetra- or pentapyridyl ligands. We synthesized a new Co(II) complex based...

Université de Fribourg

Origin of the enhanced photoluminescence quantum yield in mapbbr3 perovskite with reduced crystal size

Droseros, Nikolaos ; Longo, Giulia ; Brauer, Jan C. ; Sessolo, Michele ; Bolink, Henk J. ; Banerji, Natalie

In: ACS Energy Letters, 2018, vol. 3, no. 6, p. 1458–1466

Methylammonium lead bromide perovskite (MAPbBr3) has been widely investigated for applications in visible perovskite light-emitting diodes (LEDs). Fine-tuning of the morphology and of the crystal size, from the microscale down to the quantum confinement regime, has been used to increase the photoluminescence quantum yield (PLQY). However, the physical processes underlying the PL emission of...

Université de Fribourg

Dissociative electron attachment and electronic excitation in Fe(CO)5

Allan, Michael ; Lacko, M. ; Papp, P. ; Matejčík, Š. ; Zlatar, Matija ; Fabrikant, Ilya I. ; Kočišek, J. ; Fedor, Juraj

In: Physical Chemistry Chemical Physics, 2018, vol. 20, no. 17, p. 11692–11701

In a combined experimental and theoretical study we characterize dissociative electron attachment (DEA) to, and electronically excited states of, Fe(CO)5. Both are relevant for electron-induced degradation of Fe(CO)5. The strongest DEA channel is cleavage of one metal–ligand bond that leads to production of Fe(CO)4−. High- resolution spectra of Fe(CO)4− reveal fine structures at the...