LCST behavior of amphiphilic aryl-ether AB-type dendron bearing OEG chains

An amphiphilic aryl-ether AB2-type dendron（1）bearing oligo ethylene glycol（OEG）chains exhibited lower critical solution temperature behavior in aqueous solutions. In the presence of salting-out salts（Na2SO4, NaCl, and NaBr）, cloud points 1 decreased linearly with increasing salt concentration. The slope linear decrease changed anion type order, SO42－ > Cl－ Br－. salting-in salts（NaSCN NaI）, increased non shape these curves can be well fitted by adding a Langmuir binding isotherm to term used for salts. When monohydric alcohols（ethanol 1-propanol）were added solutions 1, barely but were reduced after polyhydric alcohols（ethylene glycol, xylitol, D-sorbitol）. effect on was negligible alcohol Conversely, addition alcohols could amplify points. alkyl groups hydrated water molecules accompanied formation hydration shell clathrate-like structure. Hence, free are consumed Overall, amplifi cation eff ect clouding deduced concentration around 1.