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Journal articles
Acid/Base-Triggered Switching of Circularly Polarized Luminescence and Electronic Circular Dichroism in Organic and Organometallic Helicenes
Abstract : Electronic circular dichroism and circularly polarized luminescence acid/base switching activity has been demonstrated in helicene-bipyridine proligand 1 a and in its “rollover” cycloplatinated derivative 2 a. Whereas proligand 1 a displays a strong bathochromic shift (>160 nm) of the nonpolarized and circularly polarized luminescence upon protonation, complex 2 a displays slightly stronger emission. This strikingly different behavior between singlet emission in the organic helicene and triplet emission in the organometallic derivative has been rationalized by using quantum-chemical calculations. The very large bathochromic shift of the emission observed upon protonation of azahelicene-bipyridine 1 a has been attributed to the decrease in aromaticity (promoting a charge-transfer-type transition rather than a π–π* transition) as well as an increase in the HOMO–LUMO character of the transition and stabilization of the LUMO level upon protonation.
Cited literature [31 references]
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01090117
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Monday, December 9, 2019 - 1:10:24 PM
Last modification on : Tuesday, December 14, 2021 - 8:36:13 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 8:09:20 PM
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Monday, December 9, 2019 - 1:10:24 PM
Last modification on : Tuesday, December 14, 2021 - 8:36:13 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 8:09:20 PM
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