The rotational spectrum of the dimethylether (DME)-N2O complex has been studied for the normal and three15N isotopomers, leading to rotational, centrifugal distortion, and nuclear quadrupole coupling constants, themolecular structure, and a binding energy of 8.4 kJ mol-1. Here, it is shown that many DME-N2O-typecomplexes are bound with three intermolecular bonds and that the internal rotation splitting due to the methylgroups in the rotational spectrum was fixed by complexation, implying that many weak intermolecular bondscan fix the flexible motions and maintain a rigid structure. If the model we are proposing for DME-N2O-typecomplexes can be applied to biomolecules, it may give something a clue to solve the biological riddle on thedynamic character of biomolecules that have conflicting properties of being rigid and binding weakly.
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