Fig. 3: Chain transformations between PST-5 and PST-6. | Nature Communications

Fig. 3: Chain transformations between PST-5 and PST-6.

From: 3D-3D topotactic transformation in aluminophosphate molecular sieves and its implication in new zeolite structure generation

Fig. 3

a1 Double-crankshaft chain (dcc) and a2 double four-ring (d4r) unit in PST-5, and b1 and b2 narsarsukite chain (nsc) in PST-6. The removal of bridging hydroxyl groups associated with the dcc and d4r initiates the geometry changes of penta-coordinated Al atoms, resulting in cleavage of Al–O–P bonds (corresponding O atoms are shown in white) followed by inversion and reconnection of the tetrahedra (indicated by arrows). Both dcc and d4r transform to nsc in PST-6. Green, penta-coordinated (and penta-coordinated derived) AlO4 tetrahedra; yellow, tetra-coordinated AlO4; blue, PO4. Oxygen atoms associated with OH or bond-breaking in the chains are shown in white and the rest O in red.

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