Abstract:

Comparing  two  5,10,15,20meso-4(hydroxyphenyl)porphyrin (H₂THPP) compounds  synthesized at different time, we found that one was  H₂THPP monomer and the other was  H₂THPP selfassembly dimer. We found two types of oxygen atoms by means of X-ray photoelectron spectroscopy(XPS), and the optimum configuration of H₂THPP dimer was calculated with the help of  chemical simulation.  H2THPP monomer did not show transient surface photovoltaic signal,   while  H₂THPP dimer showed strong transient surface photovoltaic signal. The optical limiting properties of H₂THPP dimer are better than thoes of H₂THPP monomer.

Key words: meso-4(hydroxyphenyl)porphyrin, selfassembly, chemical simulation, transient surface photovoltage property, optical limiting property