Opto-electroactive amino- and pyridyl-terminated monolayers of ruII-terpyridyl complexes and their usage as Hg2+ sensors

• Verfasst von: Mondal, Prakash Chandra [VerfasserIn]
• Verfasst von: Jeyachandran, Yekkoni Lakshmanan [VerfasserIn]
• Verfasst von: Zharnikov, Michael [VerfasserIn]
• Titel: Opto-electroactive amino- and pyridyl-terminated monolayers of ruII-terpyridyl complexes and their usage as Hg2+ sensors
• Verf.angabe: Prakash Chandra Mondal, Vikram Singh, Yekkoni L. Jeyachandran, and Michael Zharnikov
• E-Jahr: 2019
• Jahr: 21 February 2019
• Umfang: 9 S.
• Fussnoten: Gesehen am 22.07.2019 ; Im Titel ist "II" und "2+" hochgestellt
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2019
• Band/Heft Quelle: 123(2019), 10, Seite 6121-6129
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/acs.jpcc.9b00894
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1669535991

Abstract

Robust opto-electroactive monolayers of three different RuII-terpyridyl complexes with amino and pyridyl termination are fabricated on SiOx-based substrates using siloxane-based attachment chemistry and either pyridyl or amine linkage to the preliminary prepared template. The UV-vis spectra of these monolayers display the characteristic metal-to-ligand charge-transfer bands, with a bathochromic shift compared to the spectra of the respective metalloligands dissolved in acetonitrile solution. This shift is notably larger for the pyridyl-linked monolayers compared to the amino-linked film, correlating qualitatively with the molecular grafting density. Cyclic voltammograms of the monolayers covalently attached onto indium tin oxide electrodes show reversible switching between the two redox states (Ru2+ to Ru3+ and vice versa), with a typical one-electron redox behavior. The sensing response of the monolayers to a series of different metal ions was tested, with the amino-decorated films showing a particularly high sensitivity to Hg2+ and a close-to-linear response to this analyte in the ppm concentration range.