Characterization of manganese tetraarylthiosubstituted phthalocyanines self assembled monolayers

Manganese tetraarylthiosubstituted phthalocyanines (complexes 1– 5) have been deposited on Au electrode surfaces through the self assembled monolayer (SAM) technique. SAM characteristics reported in this work are: ion barrier factor (∼1); interfacial capacitance (303–539 μF cm −2) and surface coverage (1.06 × 10 −10–2.80 × 10 −10 mol cm −2). Atomic force microscopy was employed in characterizing a SAM. SAMs of complexes 1– 5 were employed to detect l-cysteine (with limit of detection ranging from 2.83 × 10 −7 to 3.14 × 10 −7 M at potentials of 0.68–0.75 V vs. Ag|AgCl) and nitrite (limit of detection ranging from 1.78 × 10 −7 to 3.02 × 10 −7 M at potentials of 0.69–0.76 V vs. Ag|AgCl).