Novel salen type Schiff bases and their 3d metal complexes theoretical studies investigation on sensing optical biological and catalytic activities

Abstract

Salen-type ligands in the Schiff base family are formed by the newlinesimple condensation reaction of derivatives of salicylaldehyde with newlinedifferent diamines. Recently, a novel class of salen ligands were designed newlineby inorganic chemists by incorporating Lewis donor functionalities newlineespecially oxygen atom in the ortho position of the salicylaldehyde newlinemoieties. Theses class of ligand systems (N2O2 type) are widely used newlinenow a days not only because of its facile synthesis but also for their newlineplanar array of two covalent and coordinate sites which allow them to newlinecoordinate and stabilise a number of metal ions from main group and newlinetransition series. The fascinating attributes of these class of compounds newlinewill never end since these simple compounds offer high degree of newlinefunctionalities similar to that of macrocyclic porphyrins having single to newlinemulti compartments. newlineTo date, numerous N2O4 type salen Schiff base ligands have been newlinesynthesized by incorporating a hetero atom (oxygen) at the ortho position newlineof phenolic group and are used for the development of transition metal newlinecomplexes especially in the 3d family. These N2O4 donor Schiff base newlineligands can behave like bicompartmental ligands and much attention has newlinebeen given by chemists in developing heterometallic compounds of newlinedifferent topologies using these compartmental ligands. Instead of newlinesynthesising hetero or multi metallic compounds, we tried to investigate their use in different fields and the chapters are divided based on the newlineapplication studies. newlineThe salen ligands and their mononuclear Ni(II) compounds can newlinebe used as sensors for different analytes. In the first chapter, the newlinesynthesized salen Schiff bases are used for the effective recognition of newlinethe analyte L-arginine which is a diagnostic indicator for various human newlinediseases. We are able to achieve appreciable detection limit and naked newlineeye detection with in 12 to 15 minutes. Furthermore, the structural tuning newlineis possible in order to improve its efficiency and this fact is proved by newlinetheoretical studies.