Asserting its independence: A single organic molecule containing pyrene and rhodamine B chromophores separated by a peptide spacer formed a mechanochromic material whose fluorescence could be switched from blue to bluish-green and reddish by grinding. Modulation of the overlapped packing pattern of the pyrene excimer for blue emission was crucial for the reversible tricolored switching observed.
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Ma et al. (2013) studied this question.
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