Bioinorganic chemistry is a relatively new, vigorously pursued, vibrant research area.
However, the difference is subtle and which to use seems to be a matter of almost arbitrary choice. As the scope of the field is very wide, it would be difficult to adequately cover its entirety in a small volume like this. Therefore, an author has to make a choice as to what topics be covered, and this author rightly says that the book is illustrative rather than comprehensive. What the author decided to cover is as follows. Fundamentals of Inorganic Biochemistry Chapter 2.