27Al → 31P 3QMAS/HETCOR experiment in aluminophosphate molecular sieves

A 3QMAS/HETCOR experiment between spin-5/2 nuclei (Al-27) and spin-1/2 nuclei (P-31) has been applied to aluminophosphate molecular sieves. It was shown that a reasonable sensitivity of the experiment can be achieved even on a narrow-bore NMR spectrometer that allows only low radiofrequency fields, if the conversion from the aluminium triple quantum into single quantum level and cross-polarization from aluminium to phosphorus nuclei are carefully optimized. The application of ANAFOR processing to the 3QMAS/HETCOR data was also demonstrated and it was shown that in this way the required experimental time can be reduced, approximately, by a factor of ten.