Abstract

The (NO) 2–Na + triplet state complex stabilised in Na–A zeolites at low temperature was studied by pulsed EPR. The 3-pulse ESEEM spectra at 5 K were analysed by simulations in the time-domain, followed by Fourier transformation. The ESEEM was attributed to the interaction with Na +. The hyperfine coupling A( 23Na) = (4.6, 4.6, 8.2) MHz and nuclear quadrupole Q( 23Na) = (0.3, 0,3, −0.6) MHz tensors are of comparable magnitude as in the NO–Na + complex determined earlier. The complexes are proposed to be either pairs of NO–Na + or ON–Na +–NO.

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