Phthalocyanine
![Skeletal formula](/Images/godic/202502/05/Phthalocyanine.svg5610.png")
![Ball-and-stick model](/Images/godic/202502/05/Phthalocyanine-3D-balls5610.png")
![STM images of individual phthalocyanine molecules recorded at a bias of −2 V (left) and +1 V (right). Note that STM probes density of electrons in the HOMO/LUMO bands rather than atomic profiles.[5]](/Images/godic/202502/05/Phthalocyanine_STM5610.jpg")
![](/Images/godic/202502/05/Copper_phthalocyanine.svg5610.png")
Phthalocyanine is an intensely blue-green-coloured aromatic macrocyclic compound that is widely used in dyeing. Phthalocyanines form coordination complexes with most elements of the periodic table. These complexes are also intensely colored and also are used as dyes or pigments.