A porphyrin-incorporated self-assembled monolayer (SAM) on gold, in which the macroplane of the porphyrin molecule assumes a nearly flat orientation with respect to the surface of the Au substrate, was prepared by formation of a 4-pyridinethiol SAM on gold followed by axial ligation of metalloporphyrin (CoTPP) to it. The porphyrin SAM was characterized by surface-enhanced Raman scattering (SERS) and electrochemical techniques.
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Zhang et al. (1999) studied this question.
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