Nasser Safari - Chemistry Department, Shahid Beheshti University, Evin, Tehran, Iran.
Ezedin Mohajerani - bOrganic Material & Polymer Photonics Lab, laser Research Institute, Shahid Beheshti University, Evin, Tehran, Iran.
Hashem Shahroosvand - aChemistry Department, Shahid Beheshti University, Evin, Tehran, Iran
Samira Osati - aChemistry Department, Shahid Beheshti University, Evin, Tehran, Iran

Green laser and UV irradiations of porphyrin solutions in dichloromethane solvent leads to various extents of protonation, aggregation and formation of solid deposits depending on the light source and the nature of the specific porphyrins. In order to evaluate the role of various factors in controlling the main characteristics of samples, we investigated the behaviour of a series of mesosubstituted aryl porphyrin bearing protonable methoxy pripherial group together with metal derivate of 3.4 dimethoxy TPP. The Hydrogen bonding properties together with the electrostatic contribute to stabilize the growing nanoparticles at the interface between the solution and the supporting surface. AFM images clearly show two patterns of J-aggregate in deposited porhyrins.

Green Laser, Porphyrin, J-aggregate