Dinuclear manganese chelates

The reaction between manganese(n) and terpy in DMSO has been shown to occur in two stages the rapid formation of a dinuclear intermediate is followed by a very slow reaction, which is attributed to final chelate-ring closure. The proposed mechanism is shown in Scheme 3. Analysis of the rate behaviour yielded the following rate constants ki — 1.64x 10 lmol s and k i = 46.1 s (both at 292.1 K) it3 = 2.58 xl0- s- (at 314.1 K). 

---