The water adducts of triacetone triperoxide (TATP) have been observed by using broadband rotational spectroscopy. This work opens a new way for the gas-phase detection of this improvised explosive. The observed clusters exhibit unusual water dynamics and rarely observed multicenter interactions. TATP-H O is formed from the D symmetry conformer of TATP with water lying close to the C axis. Water rotation around this axis with a very low barrier gives rise to the rotational spectrum of a symmetric top. The main interaction of the monohydrate is a four-center trifurcated donor O -H⋅⋅⋅O hydrogen bond, not observed previously in the gas phase, reinforced by a weak four-center trifurcated acceptor C-H⋅⋅⋅O interaction. Surprisingly, all structural signatures show the weakness of these interactions. The complex TATP-(H O) is formed from the monohydrated TATP by the self-association of water.
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