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Optical activity of chiral palladium complexes [Si-O-PdMe(S-/R-BINAP)] covalently bound to silica through grafting.
Molecules 31:4058 (2026)
The transfer of molecular chirality to solid surfaces is a focus of research due to its importancefor practical applications. While several chiral metal complexes have been anchored tometal oxide surfaces via linkers, the optical properties of those with a direct covalentbond between the metal center and the support’s surface oxygen remained unexplored.This study reports the separate synthesis of both enantiomers of palladium(II)-methyl-BINAP complexes (2,2′–Bis(diphenylphosphino)–1,1′–binaphthylmethylpalladium(II))on silicon dioxide. The precursors [PdMe2 (S-BINAP)] and [PdMe2 (R-BINAP)] weresynthesized, characterized, and grafted onto partially dehydroxylated SiO2 to form PdMe(S-BINAP)/SiO2 and PdMe(R-BINAP)/SiO2 . Solid-state NMR, infrared spectroscopy, andcircular dichroism spectroscopy are consistent with site isolation and the structures ofboth enantiomerically pure surface complexes. The grafted complexes exhibit mirror-image CD spectra with features distinct from their molecular precursors, indicating thatimmobilization modifies their chiroptical response. The thermal stability of the surfacecomplexes was studied by temperature-programmed experiments.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
1420-3049
e-ISSN
1420-3049
Journal
Molecules
Quellenangaben
Volume: 31,
Issue: 22,
Article Number: 4058
Publisher
MDPI
Publishing Place
Basel
Reviewing status
Peer reviewed
Institute(s)
Institute of Structural Biology (STB)