Mu-13: a new AlPO4 prepared with 4,13-diaza-18-crown-6 as a structuring agent

The chemistry of phase selectivity in the synthesis of high-silica zeolites

“…For example, the tris -quaternaryammonium compound (molecule 27) used to prepare the unusual zeolite ZSM-18 (MEI) possesses a structure with pseudo three-fold symmetry that nicely matches the symmetry and size of the cage within which the SDA resides [14]. Zeotype structures with the MSO topology are prepared using 18-Crown-6 polyether molecules (26 or analogous azamacrocycles) in both aluminosilicate [15] and aluminophosphate [16] chemistries. The large 18-membered ring cage in the MSO framework shares a remarkable resemblance with the crown ether molecule used to prepare it (Fig.…”

Investigating Relationships between the Crystal Structure and 31P Isotropic Chemical Shifts in Calcined Aluminophosphates

“…In early work, this task of assignment was carried out using relatively simple relationships between structural features (e.g., bond lengths or angles) and NMR parameters, most notably the relationship proposed by Müller et al, between the 31 P isotropic shift, δ iso , and the average P–O–Al bond angle, ⟨θ POAl ⟩ . Since its publication, this relationship has been widely used to assign the 31 P NMR spectra of many phosphate materials, including templated − and calcined − AlPOs, AlPO-like clusters, , Si-doped AlPOs (SAPOs), , gallophosphates (GaPOs), , a zincophosphate (ZnPO), and several other relevant structures. ,− The results of these assignments are plotted in Figure and show a general trend of increasing δ iso with decreasing ⟨θ POT ⟩ (T = Al, Si, Ga, Zn, etc.) for all classes of material included in the plot.…”

“…Since their discovery in 1982, 1 aluminophosphate zeolites (AlPOs) have been a field of intense research, owing to their many potential applications in catalysis, medicine, and gas storage. 2 As many of the elements present in AlPOs have NMR-active isotopes with favorable acquisition properties (most notably 31 P, 27 Al, and, in many cases, 1 H and 19 F), solid-state NMR spectroscopy is often used to characterize these materials. Owing to its sensitivity to structure on the local (atomic) scale, the information provided is often complementary to the information able to be obtained by techniques based on Bragg diffraction.…”

22 New compounds and structures in the solid state

“…20 4 6 ] cage. 90 The first gallium phosphate to contain a 24-ring channel has been prepared. [Ga 2 (DETA)(PO 4 ) 2 ]ؒ2H 2 O contains a hexagonal close-packed channel arrangement in which the diethylenetriamine (DETA) binds in a tridentate fashion to half of the Ga centres within the framework.…”