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. Author manuscript; available in PMC: 2018 Jul 15.
Published in final edited form as: Nat Methods. 2018 Jan 15;15(3):194–200. doi: 10.1038/nmeth.4578

Figure 2. Chemical strategies for Raman frequency expansion of polyynes.

Figure 2

(a) Frequency modulation on the unified polyyne scaffold by conjugation elongation, isotope doping and end-capping variations. (b) Frequency coarse-tuning with bond-selective 13C isotope labeling (in red). (c) Frequency fine-tuning with electron-donating and electron-withdrawing groups (in blue). The red dashed spectra are the 2119 cm−1 and 2141 cm−1 peaks from (b).