STUDIES ON THE ANION SENSITIVITY OF IMMOBILIZED METALLOPORPHYRINS FORAPPLICATION AS OPTOCHEMICAL SENSORS

Different metal complexes of tetra(4-aminophenyl)porphyrin and tetra(4 -N-methylpyridyl) porphyrin have been immobilized in thin films of Naf ion. The absorbance spectra of the immobilized metalloporphyrins are f ound to change while coordinating anions such as iodide and thiocyanat e and an organic nucleophile like pyridine. To study the potential of these layers for application as optochemical sensors, the properties o f the reaction have been investigated. The immobilized cobalt complex is found to be able to determine thiocyanate reversibly. No loss of re agent is found over four weeks under continuous operation.