SYNTHESIS AND CHARACTERIZATION OF THE MAGNESIUM SILICOALUMINOPHOSPHATES MAPSO-43 AND MAPSO-39

MAPSO-39 and MAPSO-43 have been synthesized, the latter material obtai ned as a pure phase in the absence of the usual cocrystallizing MAPSO- 46 phase. Si-29 NMR data and chemical analysis support the incorporati on of silicon into the framework of the two materials, though this is only to a limited extent. The different P(nMg) environments have been identified in the P-31 NMR spectra of both materials. For MAPSO-43, th e relative populations of P(nMg) environments are consistent with the random distribution of Mg among the Al sites of the framework. Analysi s of the possible ordered configurations of Mg in the framework is als o not consistent with the observed NMR data.