Two
enantiomers with helical carbon frameworks (M-HCFa and P-HCFa) and
their conformational isomers (M-HCFb and P-HCFb) have been synthesized
and characterized. The single-crystal analysis revealed the novel
structures in which three propeller blades spiro-fused on two central
benzene rings. The optical properties were further investigated, and
stable bipolar electrochemiluminescence emissions were discovered
for the first time existing in helical carbon frameworks, which provide
new insights into the future development of high-performance molecular
luminescent devices.
Two homologous branched dodecaynes 1,3,5-{(4-<i>t</i>Bu)[2,3-(RC≡C)<sub>2</sub>]Ph(C≡C-C≡C)}<sub>3</sub>Ph (<b>2a</b>, R = H; <b>2b</b>, R = Ph) were synthesized and characterized in this work. According to steady-state spectroscopy, their electronic absorption and luminescent behaviors were investigated and compared. Simultaneously, as a typical structure of this class of dodecaynes, the molecular configuration of dodecayne <b>2a</b> was depicted by DFT simulation and the maximal absorption were supported by the subsequent TD-DFT calculations. In addition, the electrochemiluminescence (ECL) emission was also investigated. The experiment results showed that π-extended dodecayne <b>2b</b> with more distorted trigonal-planar possessed strong and stable ECL emission, indicating that it has potential application in ECL and luminescence fields.
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