Monolayers of the photosensitive benzodithia-15-crown-5 derivative

Multifunctional membranes based on photosensitive crown-ether derivatives with advanced properties

“…The maximum absorption intensity in the spectra of type-Ib monolayers in the presence of NaCl substantially exceeds the absorption intensity of similar monolayers in the presence of CaCl 2 , MgCl 2 , or KCl (Fig. 4), which is due to the selectivity of cations bonding to the PCED in the monolayer [19][20][21].…”

“…Studies of PCED types Ia-Ic [18][19][20][21] showed their capability of forming stable monolayers at the air-water and water-alkali metal salt solution (Fig. 2, the isotherms presented refer to PCED type Ib).…”

“…1a), have been synthesized at the Photochemistry Center of the Russian Academy of Sciences [17] and recently become the subject of intense studies [17][18][19][20][21]. The presence of a crownether fragment in these dyes facilitates their selective bonding to metal cations.…”

“…2a and b), which points to an interaction between PCEDs and alkaline or alkaline earth metal cations. The authors [18][19][20][21] believe that the inclusion of a cation in a PCED monolayer increases the mutual repulsion of the positively charged molecules and the surface area (A) per type-Ib PCED molecule in the monolayer (Fig. 2a).…”

“…Valuable information on the packing of PCEDs in monolayers directly at interfaces was obtained from absorption and fluorescence spectroscopy data [19][20][21][22]. For example, an intense absorption band is present in the electronic spectra of types Ia-Ic PCED monolayers (recorded directly on the surface of distilled water and 10 mM salt solutions) in the region of 450±5 nm (Fig.…”