  We investigate the dynamics of entanglement in the excitation transfer
through a chain of interacting molecules. In the case of two-molecule coupled
to noisy environments we show that entanglement can be further enhanced if the
distance between the molecules is oscillating. Our results demonstrate that
motional effect plays a constructive role on quantum entanglement in the
dynamics of excitation transfer. This mechanism might provide useful guideline
for designing artificial systems to battle against decoherence.
