Solvent friction and the entanglement of long hydrocarbon chains
摘要:
Rotation about the R2N-COOR bond in carbamates with three alkyl chains (butyl through octadecyl) was investigated by NMR. Even solvents such as hexadecane and mineral oil did not substantially impede the rotation, revealing a surprising absence of ''solvent friction'' induced by chain entanglement. Possible explanations at the molecular level and the relevance to membrane systems are discussed.