(Q57900521)

[L2Mn2(.mu.-O)2(.mu.-O2)](ClO4)2. The first binuclear (.mu.-peroxo)dimanganese(IV) complex (L = 1,4,7-trimethyl-1,4,7-triazacyclononane). A model for the S4 .fwdarw. S0 transformation in the oxygen-evolving complex in photosynthesis