We have prepared the amphiphilic molecular catalyst [Co(L)(pyrr)]ClO (1), where L is the deprotonated form of N, N'-[4,5-bis(octadecyloxy)-1,2-phenylene]dipicolinamide. Species 1 can be anchored onto a carbon black support to yield the assembly 1@CB, which can catalyze water oxidation at an affordable onset overpotential of 0.32 V, with a current density of 10 mA/cm at 0.37 V. Moreover, 1@CB displays TOF = 3850 h. A mechanism is proposed based on the experimental and density-functional-theory-calculated data.

2801ment is quite satisfactory. Similar data for solutions up to 0.1 M have been discussed by Scatchard.28The writer wishes to express his indebtedness and gratitude to the Elizabeth Thompson Science Fund for providing mechanical aid in the calculations. SummaryA report is made of the determination of the freezing points of aqueous solutions of hydrochloric acid up to a concentration of 1.0 molal, making use of a platinum thermometer as a temperature measuring device.The activity coefficients are calculated and compared with those derived from electromotive force measurements.