This book is suitable for graduate and post graduate students, professors and research scientists. It discusses classic coordination chemistry as well as present-day coordination chemistry. After an introduction to fundamentals of complexes, the book covers the relevant topics in a good comprehensive style. Metal complexes have gained importance not only in many branches of chemistry but also in some branches of biology & medicines. This book describes precisely the chemical and physical properties of the complexes & their applications. IUPAC nomenclature of complexes is also included with illustrations. This book condenses the essence of chemistry and significance of complexes. It presents basic principles of Coordination Chemistry with coverage of its all key dimensions. It covers concepts of Metal Complex Compounds, Ligands and Its Classification, Chelates, Characterization of Chelates, Chelation Therapy and Chelating Agents. This book reflects the span of modern research in coordination chemistry and tries to fulfill the need for the both kinds of learners: primary and advanced learners. Spectroscopies, magnetic moment determination, etc. are also described in a lucid manner.