(Methylacylamino)azobenzene Derivatives for Photoresponsive Monomolecular Layers

Atomic Force Microscopy Studies of Photoisomerization of an Azobenzene Derivative on Langmuir−Blodgett Monolayers

“…Domains in the size range of a few 100 nm 2 with different molecular orientations are observed before and after UV irradiation of the monolayer (see Figure ). The area per molecule measured directly from the images is 0.23 ± 0.02 nm 2 , which is the same as the area for the trans isomer obtained from the isotherms of the monolayers . The molecules are packed in an hexagonal closed-packed crystalline array.…”

“…The synthesis of this and similar derivatives was described by E. Markava and coauthors . The reversible photoisomerization has been observed in chloroform solution, but when the monolayer at the air/water interface was irradiated, at least at the pressure of 10 mN/m, no surface pressure changes were appreciated, meaning that the trans/cis photoisomerization is probably blocked by the close packing of the azobenzene groups.…”

<title>Electrical and structural properties of LB multilayers of (methylacylamino) azobenzenes</title>

“…In order to investigate photoisomerization processes, the LB monolayer assemblies was irradiated with a xenon lamp of 100W and a maximum emission peak of 355nm for 30-60mm. 3. RESULTS AND DISCUSSION 3.1.…”

Adsorption of linear and star-shaped poly(acrylic acid) to model surfaces formed by amphiphiles at the air/water interface

“…[7] The extrapolated area per molecule (0.55 nm 2 ) is considerably larger than expected from the area required to accomodate the azobenzene containing alkyl chain (0.25 -0.30 nm 2 ). [31] This can be rationalized taking into account the relatively large headgroups and the electrostatic repulsion between them. [7] The effect of polyelectrolyte addition to the subphase of amphiphile 2 monolayers is similar to that described above for amphiphile 1.…”