Discuss your observations regarding the acid/base chemistry ofthe Mn(IV) dimer, including stoichiometry, reversibility, andtemperature effects.

Protonation of[MnIV(salpn)(µ-O)]2omplex gets protonated? Where else couldyou have protonated the complex

• Dissolve 0.1 mmol (70 mg) of [MnIV(salpn)(O)]2 in 200 mL ofmethylene chloride. Divide the solution into 4 equal portions. Youmay want to reserve a small amount of this solution (approx. 10 mL)for color comparison. For each of the following steps, be sure tomake careful observations regarding the color of the solution. Thebest way to do this is to bring a little bit up in a pasteurpipette and use a flashlight (you may use your phone for thispurpose) to aid in seeing the color of the solution.

• To one portion, add one equivalent of triflic acid (25 µL of1.0 M solution in acetonitrile).

• To a second, add two equivalents triflic acid (50 µL of 1.0 Msolution).

• Cool the two remaining portions to –78 °C in a dry ice/acetonebath, and add one equivalent triflic acid to one portion and twoequivalents to the other. (Keep the flasks covered while cooling toavoid water condensation in the solutions.)

• Add 1 equivalent of triethylamine (7.2 M, so .025 mmol = 3.5µL: For convenience, dilute 100 µL to 1 mL in acetonitrile and use35 µL per equivalent) for each equivalent of triflic acid added toeach solution above