Anion- and solvent-induced single-crystal-to-single-crystal transformation within an iron(II) triazole system has been generated from {[Fe(TPPT)Cl]·CHCl} (1a) to [Fe(TPPT)(CO)Cl(HO)] (1b). Luminescence studies indicated that the resultant 1b can be considered as a promising luminescent probe for CrO and cyano molecules.
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