An especially robust compound and its derivative
metal complexes that are approximately one hundred-fold superior in catalytic performance to the previously invented TAML analogs is provided having the formula (I) wherein Y1, Y2, Y3 and Y4 are
oxidation resistant groups which are the same or different and which form 5- or 6-membered rings with a
metal, M, when bound to D; at least one Y incorporates a group that is significantly more stable towards nucleophilic
attack than the organic amides of TAML activators; D is a
metal complexing donor atom, preferably N; each X is a position for addition of a labile Lewis acidic
substituent such as (i) H, denterium, (ii) Li, Na, K, alkali metals, (iii) alkaline earth metals, transition metals,
rare earth metals, which may be bound to one or more than one D, (iv) or is unoccupied with the resulting
negative charge being balanced by a nonhonded counter-action; at least one Y may contain
a site that is labile to acid dissociation, providing a mechanism for shortening complex lifetime. The new complexes deliver catalytic performances that promise to revolutionize multiple oxidation technology spaces including water purification.