We report on the synthesis and single-crystal structure of a novel cobalt-substituted aluminophosphate. Crystal data: monoclinic, space group P2 1 c (no. 14), a = 8.593(1), b = 15.540(1),c = 7.736(1) , β = 110.65(1)°, V = 966.7(4) 3 , Z = 4, R = 0.037, and R w = 0.029 for 2280 contributing reflections and 182 variables. Refined framework-atom bond distances and angles exhibited regular tetrahedral coordination of Al and P [d a v e (Al-O) = 1.74(1) , d a v e (P-O) = 1.54(2) ] and distorted Co-centered octahedra. The Co substituted every second aluminum in the ordered Al-P distribution and was coordinated to five framework oxygen atoms and to one nitrogen atom from a template ethylenediamine molecule located in an eight-member ring opening. Structure collapsed in the absence of template.