Letters

Retraction

Science  08 Nov 2002:
Vol. 298, Issue 5596, pp. 1171
DOI: 10.1126/science.298.5596.1171b

In our report, “evidence for coherent proton tunneling in a hydrogen bond network” (1), we presented nuclear magnetic resonance relaxometry results for calix (4) arene in the solid state. A peak at 35 MHz in the magnetic field dependence of the proton spin-lattice relaxation rate was interpreted as a manifestation of coherent proton tunneling in a cyclic array of four hydrogen bonds. In the course of further investigations, it has become apparent that the sample supplied to us contained residues of dichloromethane. This brings into question the assignment of the spectral feature because we cannot now rule out the possibility that it derives from quadrupole resonance transitions associated with chlorine nuclei. Thus, we must retract our report. Conclusions regarding the incoherent tunneling of protons in this material are not in question.

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