DIFFERENCE IN OPTICAL-PROPERTIES OF MONOLAYER ASSEMBLIES OF TETRAPHENYLPORPHYRIN DERIVATIVES PREPARED BY VERTICAL DIPPING (LB) AND HORIZONTAL LIFTING (HL) METHODS

Polarized absorption and the third order nonlinear optical susceptibil ities for monolayer assemblies of tetraphenylporphyrin derivatives pre pared by vertical dipping(LB) and horizontal lifting(Hl)methods are de termined by optical third-harmonic generation(THG) measurements at a w avelength of 1907 nm. It has been found that Y-type films prepared by LB method show larger red shift in the UV-vis absorption spectra and a lso give larger chi((3)) in, comparison with the X-type films prepared by HL method. This result is discussed with the difference in the ele ctronic interaction between the porphyrin molecules in the films, indu ced by the transferring process.