Applications Transition metal complexes of acylhydrazones and related N, O donor Schiff bases and their metal complexes have attracted considerable attention during recent years because of their applications in several bio-chemical, industrial and analytical processes. Some of the applications of these compounds are mentioned below: As biological probes As optical devices As catalyst Mesogenic behavior As sensing material As DNA cleaving agents Super oxide dismutase-mimic activity In analytical processes Other uses The hydrazones have been used as plasticizers and stabilizers for polymers [Kuhn et al. (2001), Gupta et al. (2007)], polymerization initiators and antioxidants etc. Hydrazone compounds have the ability to control the release of volatile aldehydes and ketones [Levrand et al. (2006)]. The phenyl derivative Schiff bases have been used as corrosion inhibitors for aluminium in hydrochloric solution [Unaleroglu et al. (2001)]. It is apparent from the above applications that the selected field of transition metal complexes of N, O donor ligands is very useful and multi-dimensional. Each new ligand/ new complex or new study gives a new direction to the area of research.