Fig. 1

Chemical structures of a iron phthalocyanine and b iron-tetra-2,3-pyridinoporphyrazine (FeAzPc-4N). c Schematic image of a carbon nanotube with molecularly adsorbed FeAzPc-4N

Chemical structures of a iron phthalocyanine and b iron-tetra-2,3-pyridinoporphyrazine (FeAzPc-4N). c Schematic image of a carbon nanotube with molecularly adsorbed FeAzPc-4N