Phthalocyanine

<p>Phthalocyanine (H2Pc) is a large, <a href="/facts/Aromaticity/wK0DzRY6">aromatic</a>, <a href="/facts/Macrocycle/4GPougjf">macrocyclic</a>, <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula (C8H4N2)4H2 and is of theoretical or specialized interest in chemical dyes and photoelectricity.
</p><p>It is composed of four <a href="/facts/Isoindole/eTxUlq54">isoindole</a> units linked by a ring of nitrogen atoms. (C8H4N2)4H2 = H2Pc has a two-dimensional geometry and a ring system consisting of 18 <a href="/facts/%25CE%25A0-electron/3Q6LAGYK">π-electrons</a>. The extensive <a href="/facts/Delocalization/jsquhECb">delocalization</a> of the π-electrons affords the molecule useful properties, lending itself to applications in dyes and pigments. <a href="/facts/Metal_complex/1tCyeQUm">Metal complexes</a> derived from Pc2−, the conjugate base of H2Pc, are valuable in <a href="/facts/Catalyst/LPBS7TQC">catalysis</a>, <a href="/facts/Organic_solar_cell/JYasD3Ld">organic solar cells</a>, and <a href="/facts/Photodynamic_therapy/qHIQzT5K">photodynamic therapy</a>.
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Phthalocyanine open-in-new

Phthalocyanine