The determination of the average 27Al-31P distance in aluminophosphate molecular sieves with SEDOR NMR.
The average 27Al-31P distances in an aluminophosphate, AlPO4-5, and in a silicoaluminophosphate, SAPO-11, were determined by using Spin Echo DOuble Resonance (SEDOR). A calculated SEDOR curve was fitted to the data in order to obtain the dipolar coupling constant. The tetrahedral surrounding of 27Al by four 31P atoms in the second coordination sphere was taken into account in the calculation of the theoretical SEDOR curve. The average 27Al-31P distances obtained by using this technique proved to be in good agreement with X-ray diffraction data.
N.S.R. Center for Molecular Design, Synthesis and Structure, University of Nijmegen, Netherlands.
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van Eck
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Veeman
D000535:Aluminum / Q000737:chemistry; D017607:Aluminum Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008433:Mathematics; D008956:Models, Chemical; D015394:Molecular Structure; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry
D017607:Aluminum Compounds; D010710:Phosphates; D010758:Phosphorus; D000535:Aluminum; C012714:aluminum phosphate