Homogeneous photocatalytic H2 production using a RuII bathophenanthroline metal-to-ligand charge-transfer photosensitizer

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dc.contributor.author Khnayzer, Rony S.
dc.contributor.author Olaiya, Babatunde S.
dc.contributor.author El Roz, Karim A.
dc.contributor.author Castellano, Felix N.
dc.date.accessioned 2017-11-07T08:03:22Z
dc.date.available 2017-11-07T08:03:22Z
dc.date.copyright 2016 en_US
dc.date.issued 2017-11-07
dc.identifier.issn 2192-6506 en_US
dc.identifier.uri http://hdl.handle.net/10725/6524
dc.description.abstract The prototypical [Ru(bpy)3]2+ (bpy=2,2′-bipyridine) photosensitizer has been previously demonstrated to be labile in aqueous photocatalytic solutions, especially in the presence of coordinating electron donors. Here, an alternative RuII molecular sensitizer, [Ru(dpp)3]2+ (dpp=4,7-diphenyl-1,10-phenanthroline or bathophenanthroline), is described, which is considerably more stable than its bpy congener, allowing enhanced photocatalysis metrics in conjunction with a cobalt glyoxime ([Co(dmgH)2pyCl], dmgH=dimethylglyoxime, py=pyridine) water reduction catalyst and N,N-dimethyl-p-toluidine (DMT) as the sacrificial donor in a 1:1 mixture of CH3CN/H2O. Photoluminescence studies revealed that DMT reductively quenches the excited state of [Ru(dpp)3]2+ with a bimolecular rate constant of kq=4.9×109 m−1 s−1. The rate constant measured for electron transfer from the reduced sensitizer to the [Co(dmgH)2pyCl] was found to be near the diffusion limit, kCo=2.4×109 m−1 s−1. H2 production by photocatalysis was independently monitored by using a high-throughput photochemical reactor equipped with pressure transducers, gas chromatogram, and a mass spectrometer for detection; this illustrated that the composition yields high turnover numbers (TONs), approaching 10 000 (H2/Ru) with respect to the sensitizer and deuteration studies using D2O confirmed that H2 is primarily produced from protons derived from water in these systems. en_US
dc.language.iso en en_US
dc.title Homogeneous photocatalytic H2 production using a RuII bathophenanthroline metal-to-ligand charge-transfer photosensitizer en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SAS en_US
dc.author.idnumber 200501196 en_US
dc.author.department Natural Sciences en_US
dc.description.embargo N/A en_US
dc.relation.journal ChemPlusChem en_US
dc.journal.volume 81 en_US
dc.journal.issue 10 en_US
dc.article.pages 1090-1097 en_US
dc.identifier.doi http://dx.doi.org/10.1002/cplu.201600227 en_US
dc.identifier.ctation Khnayzer, R. S., Olaiya, B. S., El Roz, K. A., & Castellano, F. N. (2016). Homogeneous Photocatalytic H2 Production Using a RuII Bathophenanthroline Metal‐to‐Ligand Charge‐Transfer Photosensitizer. ChemPlusChem, 81(10), 1090-1097. en_US
dc.author.email rony.khnayzer@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url http://onlinelibrary.wiley.com/doi/10.1002/cplu.201600227/full en_US
dc.orcid.id https://orcid.org/0000-0001-7775-0027 en_US
dc.author.affiliation Lebanese American University en_US

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