Schiff Base Metal Complexes for Second Order Nonlinear Optics

The research in the development of new materials suitable for NLO purposes has increased in the last few decades. Coordination metal complexes with tetradentate Schiff base ligands are a good target to aim to, since they are robust, chemically and physically stable, and the degrees of variability that can lead to an enhancement of the NLO responses are great. All the chemical variations on the molecular structures (changes of the ligand skeleton and metals) studied are here reported, without going into details, in order to underline the fundamental role of the metal centre in the NLO properties and all the possible developments in the research in this specific field.