title: UV-responsive polymeric superamphiphile based on a complex of malachite green derivative and a double hydrophilic block copolymer.
abstract: We have prepared a UV-responsive polymeric superamphiphile, formed by a malachite green derivative and the double hydrophilic block copolymer methoxy-poly(ethylene glycol)(114)-block-poly(l-lysine hydrochloride)(200) (PEG-b-PLKC) on the basis of electrostatic interactions. The malachite green derivative undergoes photo-ionization upon UV irradiation, which makes it more hydrophilic, resulting in changes in the self-assembly behavior of the polymeric superamphiphile. For this reason, the polymeric superamphiphile originally self-assembles to form sheetlike aggregates, which disassemble after UV irradiation because of the increased solubility of the malachite green derivative. By use of Nile red as a probe, the polarity of the polymeric superamphiphile solution is confirmed to be increased after UV irradiation by fluorescence spectra, which also explains the disassembly of the polymeric superamphiphile.
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
authors: Peng
authors: P
authors: Han
authors: Sichao
authors: S
authors: Li
authors: Chao
authors: C
authors: Wang
authors: Huaping
authors: H
authors: Xu
authors: Zhiqiang
authors: Z
authors: Wang
authors: Xi
authors: X
authors: Zhang
authors: Joice
authors: J
authors: Thomas
authors: Mario
authors: M
authors: Smet
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008239:Lysine / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D011092:Polyethylene Glycols / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: C092361:poly(ethylene glycol) lysine copolymer; D011092:Polyethylene Glycols; D008239:Lysine