Coordinate Links and Electron Donor-Acceptor Bonds

2 Coordinate Links and Electron Donor-Acceptor Bonds 

In his book on the electronic theory of valence that he first published in 1927 [67], N. V. Sidgwick began by classifying chemical bonds into three groups  

The polar or ionizable linkages between the oppositely charged ions in a salt 

Nonpolar, non-ionizable linkages, especially prevalent in organic compounds 

The coordinate links of Werner, capable of uniting apparently saturated 

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