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(a) Reaction between 2‐mercaptoethanol (Merc) and ethylenediamine (En), where the amine group deprotonates the thiol group and produces thiolate anions. (b) Molecular structure analysis of Merc, En and En‐Merc mixture by liquid‐phase Raman spectroscopy. (c) TGA and DTA traces of the Cu‐S molecular ink pre‐dried at 160 °C under nitrogen.
