Exchange of an H2O ligand on [(CO)3Mn(H2O)3]+ is much more rapid than on the analogous [(CO)3Mn(H2O)3]+. The activation volume (change in volume on formation of the activated complex) is -4.5 ± 0.4 cm3mol-1. The Mn complex has infrared bands at 2051 and 1944 cm-1 that can be attributed to C – O stretching vibrations. (See U. Prinz, A. E. Merbach, O. Maas, K. Hegetschweiler, Inorg. Chem. , 2004 , 43 , 2387.)
a. Suggest why the Mn complex reacts more rapidly than the analogous Re complex.
b. Is the activation volume more consistent with an A (or Ia) or a D (or Id) mechanism? Explain.
c. On the basis of the IR spectrum, is the reactant more likely a fac or mer isomer?
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