“…As gallium can readily adopt 4-, 5-, or 6-coordination in oxygen-based polyhedra under these conditions, GaPO frameworks exhibit great structural diversity; many monomeric, chain (1-D), layered (2-D) and three-dimensional (3-D) examples are now known with a number of stoichiometries and Ga:P ratios of 1:3 (1-D (5) The present work is concerned with two classes of such materials; 3-D GaPOs with Ga:P ratio of 4:5 and chain GaPOs with Ga:P ratio of 1:2. Four 3-D phases with Ga:P ratio of 4:5 have previously been characterized: [NH 3 (CH 2 ) 4 NH 3 ][Ga 4 (PO 4 ) 4 (HPO 4 )] (4-and 5-coordinate gallium) (13)) herein referred to as (V), [NH 3 (CH 2 ) 4 [Ga 4 (PO 4 ) 4 (HPO 4 )] Á 0.5H 2 O (4-, 5-and 6-coordinate gallium) (19 (23)), which contain chains of alternating corner sharing GaO 4 and PO 4 tetrahedra.…”