Copper(II) Coordination to Ligands Immobilized on Photoluminescent Porous Silicon

Abstract

Increased preorganization can be achieved by immobilizing ligands on solid supports. Photoluminescent porous silicon, which can undergo facile hydrosilylation, was used as a support for open chain neutral N- and O-donor ligands. The abilities of these ligands to bind the divalent metal ions Ni(2+), Cu(2+), Zn(2+), and Pb(2+) are examined. Immobilized ligands selectively complexed Cu(II) over the other metal ions studied. Ligands immobilized on photoluminescent porous silicon also removed a significant amount, up to 98%, of Cu(II) from copper(II)-spiked, organic-rich, seawater samples.

Formation of Tetra(ethylene oxide) Terminated Si−C Linked Monolayers and Their Derivatization with Glycine: An Example of a Generic Strategy for the Immobilization of Biomolecules on Silicon

“…Achieving specific interaction between the surface and a sample analyte requires recognition molecules to interact with the species of interest while the remaining surface resists nonspecific adsorption of other sample components. With regard to the first feature, specific interaction with a species of interest, Si−C linked organic monolayer modified surfaces have shown considerable initial promise thus far, with recognition elements for DNA hybridization detection, ,, immobilization of saccharides, peptides, enzymes, biomaterial applications, drug delivery, mass spectrometry, metal−ion binding, , and other schemes developed for biomolecular conjugation. − Although these groups have made progress in the specific coupling of recognition elements, the second important criterion of the biorecognition interface, the ability to resist nonspecific adsorption of biomolecules, has received less attention. Self-assembled monolayers (SAMs) containing oligo(ethylene oxide) (OEO) moieties have been extensively studied and have been shown to resist protein adsorption, − and recently, hydrosilylation of OEO containing alkenes on silicon has been reported. − A study by Yam et al characterized the antifouling properties of differing lengths of OEO molecules (EO n , n = 3, 6, and 9) on Si(111) by contact angle and X-ray photoelectron spectroscopy.…”