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dc.contributorWichita State University. Department of Chemistryen_US
dc.contributor.authorZheng, Greg Y.en_US
dc.contributor.authorWang, Youxiangen_US
dc.contributor.authorRillema, D. Paulen_US
dc.identifier.citationInorganic chemistry. 1996 Nov 20; 35(24): 7118-7123.en_US
dc.descriptionClink on the DOI link to access the article (may not be free)en_US
dc.description.abstractAcid-base properties for ruthenium(II) bis(2,2'-bipyridine) 3-carboxyl-2,2'-bipyridine reveal a ground state pK(a) of 0.82 +/- 0.07 and an excited state pK(a) of 2.31 +/- 0.05, a 1.5 pH unit increase from the ground state. The excited state pK(a) is temperature independent while the ground state pK(a)(0) increases with temperature and has DeltaH(0) and DeltaS(0) values of -990 +/- 149 cm(-)(1) and -4.57 +/- 0.48 cm(-)(1) K(-)(1), respectively. The acidic form of the complex emits at lower energy than the basic form at both 296 and 77 K. The emission energy maxima are solvent dependent and decrease in energy when the solvent changes from 4:1 (v/v) 2-MeTHF-CH(2)Cl(2) to water and when the pH decreases. Changes in excited state lifetimes with emission energy follow the energy gap law with an intercept of 49 +/- 1 and a slope of (2.11 +/- 0.09) x 10(-)(3). Emission quantum yields for protonated and deprotonated species in 4:1 (v/v) 2-MeTHF-CH(2)Cl(2) are 0.023 +/- 0.001 and 0.110 +/- 0.002, respectively. The temperature dependence of the emission lifetimes gives energy barriers of 270 cm(-)(1) for the complex in aqueous solution at pH -0.5, and 990 cm(-)(1) in aqueous solution at pH 4.5, and 1920 cm(-)(1) in 4:1 (v/v) 2-MeTHF-CH(2)Cl(2.)en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesInorganic chemistryen_US
dc.relation.ispartofseriesInorg Chemen_US
dc.titleAcid-base properties of the ground and excited states of Ruthenium(II) Bis(2,2'-bipyridine) 3-Carboxyl-2,2'-bipyridineen_US
dc.description.versionpeer revieweden_US
dc.rights.holderCopyright © 1996 American Chemical Societyen_US

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