title: A discrete amphiphilic organoplatinum(II) metallacycle with tunable lower critical solution temperature behavior.
abstract: Oligo(ethylene glycol) (OEG)-decorated supramolecular assemblies are distinguished by their neutral character and macroscopic temperature-sensitive phase transition behavior. OEG functionalization is an emerging strategy to obtain thermoresponsive macrocyclic amphiphiles, although known methods organize the hydrophilic and hydrophobic segments by covalent bonding. Coordination-driven self-assembly offers an alternative route for organizing OEG-functionalized precursors into nanoscopic architectures, resulting in well-defined metallacycle cores surrounded by hydrophilic scaffolds to impart overall amphiphilic character. Here a tri(ethylene glycol)-functionalized thermosensitive amphiphilic metallacycle was prepared with high efficiency by means of the directional-bonding approach. The ensembles thus formed showed good lower critical solution temperature behavior with a highly sensitive phase separation and excellent reversibility. Moreover, the clouding point decreased with increasing metallacycle concentration and addition of K(+).
authors.affiliation: State Key Laboratory of Chemical Engineering, Department of Chemistry, Zhejiang University , Hangzhou 310027, P. R. China.
authors.forename: Peifa
authors.initials: P
authors.lastname: Wei
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Cook
authors.forename: Xuzhou
authors.initials: X
authors.lastname: Yan
authors.forename: Feihe
authors.initials: F
authors.lastname: Huang
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Stang
mesh_terms: D009944:Organoplatinum Compounds / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D013696:Temperature
chemical_list: D009944:Organoplatinum Compounds