Enumeration of 4-connected 3-dimensional nets and classification of framework silicates. 3D nets based on the 4.6.12 and (4.6.10)4 (6.6.10): 2D nets

Abstract

An additional 3D net (no. 82a) was obtained by combining double-crankshaft chains with a 4.6.12 net. Removal of one of the mirror lines from the 4.6.12 2D net yields a new 3-connected net with cmm symmetry and (4.6.10)₄(6.6.10)₁ connectivity. Fifteen 4-connected 3D nets are selected from the infinite number obtainable by addition of an up or a down linkage to each 3-connected node. The most elegant one (no. 263) has strict alternation of up and down linkages, and represents the probable framework of the eleventh member of a new series of aluminophosphate molecular sieves.