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For a quaternary ammonium salt, the observed mass-spectrometry ion may represent the organic cation rather than the intact salt
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Li Y, Chu TS (2017) DFT/TDDFT Study on the Sensing Mechanism of a Fluorescent Probe for Hydrogen Sulfide: Excited State Intramolecular Proton Transfer Coupled Twisted Intramolecular Charge Transfer
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