New complexes based on tridentate bispyrazole ligand for optical gas sensing

The synthesis of four new complexes based on tridentate bispyrazole ligand by coordination of 4-[bis[(3,5-dimethyl-1H-pyrazol-1-yl)methyl]-amino]phenol with different transition metals such as Cu(NO(3))(2), NiCl(2), CoCl(2) and Cu(BF(4))(2) was reported. Their characterization by means of IR. UV-visible and mass spectroscopy was investigated. Their optical pollutant gases recognition capabilities as solid state thin layer on quartz were investigated. Different analytes have been studied such as SO(2), NO(2), CO, CH(4) and NH(3). The coordinated complex layer presents reversible system sensitivity towards SO(2) and NO(2) with good sequences in function with time. No influence on the optical properties was shown in the presence of CO, CH(4) and NH(3).