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Hines DA, Darzi ER, Hirst ES, et al. Carbon Nanohoops: Excited Singlet and Triplet Behavior of Aza[8]CPP and 1,15-Diaza[8]CPP. J Phys Chem A. 2015;119(29):8083-9doi: 10.1021/acs.jpca.5b04404.
Hines, D. A., Darzi, E. R., Hirst, E. S., Jasti, R., & Kamat, P. V. (2015). Carbon Nanohoops: Excited Singlet and Triplet Behavior of Aza[8]CPP and 1,15-Diaza[8]CPP. The journal of physical chemistry. A, 119(29), 8083-9. https://doi.org/10.1021/acs.jpca.5b04404
Hines, Douglas A, et al. "Carbon Nanohoops: Excited Singlet and Triplet Behavior of Aza[8]CPP and 1,15-Diaza[8]CPP." The journal of physical chemistry. A vol. 119,29 (2015): 8083-9. doi: https://doi.org/10.1021/acs.jpca.5b04404
Hines DA, Darzi ER, Hirst ES, Jasti R, Kamat PV. Carbon Nanohoops: Excited Singlet and Triplet Behavior of Aza[8]CPP and 1,15-Diaza[8]CPP. J Phys Chem A. 2015 Jul 23;119(29):8083-9. doi: 10.1021/acs.jpca.5b04404. Epub 2015 Jul 10. PMID: 26126017.
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J Phys Chem A. 2015 Jul 23;119(29):8083-9. doi: 10.1021/acs.jpca.5b04404. Epub 2015 Jul 10.

Carbon Nanohoops: Excited Singlet and Triplet Behavior of Aza[8]CPP and 1,15-Diaza[8]CPP.

The journal of physical chemistry. A

Douglas A Hines, Evan R Darzi, Elizabeth S Hirst, Ramesh Jasti, Prashant V Kamat

Affiliations

  1. §Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States.

PMID: 26126017 DOI: 10.1021/acs.jpca.5b04404

Abstract

The excited state properties of two nitrogen-doped cycloparaphenylene molecules, or carbon nanohoops, have been studied using steady-state and time-resolved absorption and emission spectroscopies. Quantum yield of fluorescence (Φf = 0.11 and 0.13) and intersystem crossing (Φisc = 0.45 and 0.32) were determined for aza[8]CPP and 1,15-diaza[8]CPP, respectively. We also present the proton transfer reaction between trifluoroacetic acid and the nitrogen-doped nanohoops, which resulted in significant modifications to the steady-state absorption and emission spectra as well as the triplet-triplet absorption spectra. From fluorescence quenching data we determine the equilibrium constant for the proton transfer reaction between aza[8]CPP (Keq = 1.39 × 10(-3)) and 1,15-diaza[8]CPP (Keq = 2.79 × 10(-3)) confirming that 1,15-diaza[8]CPP is twice as likely to be protonated at a particular concentration of trifluoroacetic acid.

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