Add time:08/13/2019         Source:sciencedirect.com

The 1:1 complex of Co(ClO4)2 with the H2O-insoluble tridentate 2,6-di(1H-4,5,6,7-tetrahydroindazol-3-yl)pyridine (H21) was found to be an excellent catalyst for the hydrolysis of para-nitrophenyl acetate in aqueous buffers over the pH 7.05–7.90 range, with an estimated second-order rate constant of 0.50 M−1 s−1. The Co2+ complexes of the N,N′-di-1-dodecyl analogue in micellar media and the N,N′-di-(4-carboxyphenyl) analogue in aqueous media were much poorer catalysts, poorer than the free ligands. In all cases, the pH–rate profiles indicated that free base, deprotonated or hydroxo forms were the active species. The greater success with Co(H21)2+ indicated a catalytic role for N–H deprotonation.

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