“…The high similarity of the two phases gives rise to similar absorption features, with the most intense Q-band located between 500 -750 nm 21,27 . On the contrary, non-planar Pc materials, including PbPc, ClAlPc, TiOPc, VOPc and ClInPc, exhibit vastly different polymorphs, which are assigned as monoclinic phase and triclinic phase [28][29][30] . Monoclinic form consists of molecules stacking in a face-to-face fashion, giving rise to metal ions in a linear chain 28,31 .…”