Orientation change of porphyrin in Langmuir-Blodgett films caused by a trigger molecule

Fluorescence Studies of Pyrene-Labeled Cholesterol-Bearing Polymer Films

“…A number of studies have focused on the environments provided by molecular assemblies such as micelles, [1] vesicles, [2] monolayers, [3] and Langmuir-Blodgett films. [4] Previously, we reported the spectroscopic and photochemical behavior of zinc (II) tetraphenylporphynate (ZnTPP) moieties incorporated into unimolecular micelles (unimer micelles) formed from hydrophobically modified polyelectrolytes in aqueous solution. [5,6] An example of a ZnTPP-functionalized hydrophobically modified polyelectrolytes is the terpolymer of sodium 2-(acrylamido)-2-methylpropanesulfonate, N-cyclododecylmethacrylamide, and a small amount (0.1 mol-%) of zinc (II) 5-(4-acrylamidophenyl)-10,15,20-triphenylporphynate.…”

J-aggregation of a sulfonated amphiphilic porphyrin at the air–water interface as a function of pH

“…This apparent contradiction can be solved whether it is assumed that the degenerated transitions of the Soret band are broken (splitting). Soret band splitting of porphyrins has been previously described [22,23,30,31,38,39]. In such cases, the Soret band of the porphyrins is described in terms of two mutually non-degenerated perpendicular oscillators B x (J-component) and B y (H-component).…”

“…Thus, at neutral pH, the initial porphyrin organization after spreading is maintained along the compression process. In addition, the (OD) 3 TPPS 3 monomer in solution shows a doubly degenerated Soret band at 416-420 nm, whereas two bands with features of non-degenerated linear oscillators are observed at 430 and 482 nm at the air-water interface, being perpendicularly polarized between each other, i.e., the degenerated transitions of the Soret band are broken (splitting) [22,23,30,31,38,39].…”

“…Thus, charged water-soluble porphyrins have been anchored to lipid matrix of opposite charge via electrostatic interaction [22,24,[26][27][28][29]. Mixed films with amphiphilic molecules are used for hydrophobic porphyrins [30,31]. Finally, the synthesis of amphiphilic porphyrins has developed as a novel pathway to construct the porphyrin monolayers [32][33][34][35][36].…”

Patterning of J-aggregated dyes using directed self-assembly on micro- and nanopatterned templates fabricated from phase-separated mixed Langmuir–Blodgett films

“…The Langmuir-Blodgett (LB) technique has long been known to be a useful method for preparing organic monolayers on solid substrates [10][11][12]. Nano lath lattices consisting of stripes and channels with alternating wettability have been fabricated by using wetting instabilities during the LB transfer [13].…”