"This book is very well compiled and covers key information regarding small molecules that have an important impact in our environment. ... Relevant information is supported by high-quality illustrations and figures, allowing the reader to follow discussions about mechanisms of action, structure and function of metal-active sites, biological cycles or electron pathways. ... This book will be an excellent acquisition for chemistry libraries and for researchers and students interested on bioinorganic chemistry, biochemistry or inorganic chemistry." (Norah Barba-Behrens, Transition Metal Chemistry, Vol. 41, 2016)