複選題28. Exchange of an H2O ligand on [(CO)3Mn(H2O)3]+is much more rapid than on [(CO)3Re(H2O)3]+. The activation volume for the Mn case is -4.5 ± 0.4 cm3mol-1. The Mn complex has infrared bands at 2051and 1944 cm-1 that can be attributed to C-O stretching vibrations. Which of the following are correct? (A) First row transition metal complexes are generally more substitutionally labile, thus more "weak-field" than second and third row complexes. (B) The negative volume of activation is consistent with a D (or Id) mechanism. (C) Occurrence of two infrared bands of [(CO)3Mn(H2O)3]+ is more consistent with a fac isomer. (D) mer-[(CO)3Mn(H2O)3+ is isostructural with mer-[(CO)3Re(H2O)3]+. (E) The C-O stretching vibrations observed in [(CO)3Mn(H2O)3]+should have higher vibrational frequencies as compared to free CO.