Cyclic voltammograms (CVs) of 1-H2 are shown in Fig.1. The CVs
of 1a-H2, 1b-H2 and 1c-H2 are similar. In general, the CVs of metalfree
phthalocyanines are known to exhibit irreversible oxidation
and reduction potentials around 0.6 and, 0.7 V vs. the standard
hydrogen electrode (SHE), respectively.