In this book, the authors present topical research in the study of the characteristics, properties and uses of transition metals. Topics discussed include the non-linear optical properties of transition metal nanoparticles synthesised by ion implantation; the structural and magnetic characterisation of Cu-Picolinate and Cu-Quinaldinate molecular systems; application of transition metals as active compounds in separation techniques; the reactivity of unstable chemicals in the presence of transition metals and the bioinorganic and redox reactions in biological systems of transition metals.