Transition metal compounds chemical electron-sharing bonds

It has struck many workers in the field that the transition metals and near-transition metals are the best catalysts for many gas reactions (78), and it was suggested (79) that probably the covalent bonds between the chemisorbed atoms and the metal were formed by sharing of an electron of the atom with a d electron of the metal. It is, indeed, not improbable that d electrons of the metals play an important role in these chemisorption phenomena. It is known from their role in the bond strengths of complex chemical compounds that pairing of other electrons with d electrons leads to strong bonds. An incorporation of d elec-... 

---