The hydrogen-bonding interactions in a series of poly(urethane-rotaxan
e)s were studied by infrared spectroscopy. Spectroscopic data along wi
th a one-dimensional mean-field model was used to calculate the enthal
py of hydrogen bond formation involving a polyurethane N-H moiety and
an ether oxygen atom located in a macrocycle threaded along the polyur
ethane backbone. The average enthalpy of hydrogen bonding was estimate
d at 3.0 kcal/mol.