The Magnetic Moments of Octahedral Complexes

There are three kinds of electronic structures that may be expected for the octahedral complexes MXfl of the iron-group transition elements (and also for those of the palladium and platinum groups). - 

In structures of the second kind, which occur only rarely, one of the 3d orbitals is used in bond formation, leaving four for occupancy by atomic electrons. It was mentioned in earlier editions of this book 

42 Pauling. Inc. tit. (5) also earlier edition of this book. 

Octahedral structures of the third kind are those in which d2sp bonds are formed with use of two of the 3d orbitals, leaving only three for occupancy by atomic electrons. Complexes with these structures were formerly described as essentially covalent here we shall describe them as hyperligated complexes (complexes with strong bonds). 

The value of the spin moment for iron-group ions rises to a maximum of 5.92, corresponding to five unpaired electrons, and then decreases, as shown in Table 5-1. 

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The magnetic moment of octahedral complexes can often be used to distinguish between those in which there are d sp octahedral bonds and... 

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