Abstract
The quest to decode the evolution of homochirality of life on earth has stimulated research at the molecular level. In this study, handed mirror symmetry breaking, and molecular parity violation hypotheses of systematically designed π-conjugated rotamers possessing anthracene and bianthracene core were evinced via circularly polarized luminescence (CPL) and circular dichroism (CD). The CPL signals were found to exhibit a (−)-sign, and a handed dissymmetry ratio, which increased with viscosity of achiral solvents depending on the rotation barrier of rotamers. The time-resolved photoluminescence spectroscopy and quantum efficiency measurement of these luminophores in selected solvents reinforced the hypothesis of a viscosity-induced consistent increase of the (−)-sign handed CPL signals.
Highlights
Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0036, Japan
molecular parity violation (MPV) hypothesis is based on the idea of parity-violating weak neutral current (PV-WNC), owing to the electron–nuclei interaction facilitated by massive neutral Z0 -boson (91 GeV)
BA is a core moiety of DSBA and PP is regarded as an extension of multiple
Summary
The fundamental building blocks of life on planet earth are dominated by one of the enantiomer pairs, for instance, L-amino acids and D-sugars. They are supposed to be energetically equivalent to another enantiomer and should obey the parity conservation law of mirror symmetry [1,2,3,4,5]. Based on the MPV hypothesis, various reports have estimated that the ∆Epv between mirror-image enantiomers is extremely small
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