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Hoffmann, M.E.* ; Fehn, N.* ; Gnad, C.* ; Heiz, U.K.* ; Köhler, K.* ; Kartouzian. A.

Optical activity of chiral palladium complexes [Si-O-PdMe(S-/R-BINAP)] covalently bound to silica through grafting.

Molecules 31:4058 (2026)
Verlagsversion DOI
Open Access Gold
Creative Commons Lizenzvertrag
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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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
ISSN (print) / ISBN 1420-3049
e-ISSN 1420-3049
Zeitschrift Molecules
Quellenangaben Band: 31, Heft: 22, Seiten: , Artikelnummer: 4058 Supplement: ,
Verlag MDPI
Verlagsort Basel
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Structural Biology (STB)