  It has been recently shown that in quantum systems, the complex time
evolution typical of many-bodied coupled networks can be transformed into a
simple, relaxation-like dynamics, by relying on periodic dephasings of the
off-diagonal density matrix elements. This represents a case of "quantum Zeno
effects", where unitary evolutions are inhibited by projective measurements. We
present here a novel exploitation of these effects, by showing that a
relaxation-like behaviour is endowed to the polarization transfers occurring
within a N-spin coupled network. Experimental implementations and coupling
constant determinations for complex spin-coupling topologies, are thus
demonstrated within the field of liquid-state nuclear magnetic resonance (NMR).
