Monolayer Behavior of Tetraphenylporphyrin Derivatives Containing Four Fluorocarbon Chains and Optical Properties of Their Monolayer Assemblies.
For tetraphenylporphyrin derivatives substituted with four fluorocarbon chains (TFPP), monolayers on the water surface were studied with the Brewster angle microscope together with pressure-area curves. It was found that heterogeneous aggregated structures of the monolayers were dependent upon the chain length of fluorocarbons, the metal-free or Mn-TFPP, and the periods after spreading. Polarized UV-visible spectra for the monolayer assemblies indicated that the porphyrin rings in the films were tilted on the average, but had a tendency to adopt an orientation more parallel to the water surface as the chain length of the fluorocarbon increased. The third-order nonlinear optical susceptibility for the monolayer assembly of TFPP with the shorter chains was found to be 7.0 x 10(-13) esu, and those of Mn-TFPP were enlarged. Copyright 1998 Academic Press.
Nakahara
H
Faculty of Science, Saitama University, Urawa, 338-8570, Japan
Liang
W
Fukuda
K
Wang
L
Wada
T
Sasabe
H