Separately, ~75 mg of CoBr2 was added to 10 mL of EtOH, which was heated on a hot plate to form a clear blue solution. This solution was then slowly added to the heated solution of hmba using a syringe to finally form a clear blue solution. The latter was left under N2 flow overnight to allow for evaporation and clear formation of blue-purple crystals in the solution. These crystals were filtered, washed using anhydrous diethyl ether, and finally dried on the filter by allowing further suction of N2 (see Figure ). We confirmed these crystals to be isostructural to the Co(hmba)3[CoBr4]×2EtOH crystals formed in previous studies. Similarly to these previous reports, upon storage at slightly above room temperature (~30-40 ºC) and high vacuum, the Co(hmba)3[CoBr4]×2EtOH structure was found to spontaneously release the bound EtOH molecules and form the Co(hmba)3[CoBr4] structure upon storage (see Figure ). Both crystalline structures were confirmed by XRD analysis (Figure ).