Layered Cobalt Phosphates by the Amine Phosphate Route

Two layered cobalt phosphates, I, [NH ₃ CH ₂ CH(OH) CH ₂ NH ₃ ][Co ₂ (PO ₄ ) ₂ ], and II, [NH ₃ CH ₂ CH(OH)CH ₂ NH ₃ ] [Co ₂ (HPO ₄ ) ₃ ], have been hydrothermally synthesized employing the reaction of 1,3-diammonium-2-hydroxy propane with Co ^II ions. While in I, the layers are made of 3- and 4-membered rings, they are made by 4- and 12-membered rings in II. the layers are held together by strong hydrogen bond interactions between the amine and the framework. I contains Co–O–Co linkages and becomes ferrimagnetic around 30 K, unlike II with only Co–O–P linkages which is paramagnetic. Crystal data are as follows: I, orthorhombic, a =22.894(2), b =7.568(1), c =6.697(1) Å, V =1160.3(2) Å ³ , space group= Pbcn (no. 60), Z =8, M =399.87, D _calc. =2.287 gcm ^-3 , µ(Mo K α)=3.176 mm ^-1 , λ=0.71073 Å, R ₁ =0.06, S =1.27; II, monoclinic, a =8.608(3), b =9.640(3), c =17.258(2) Å, ß=93.23(1)°, V =1429.9(2) Å ³ , space group= P 2 ₁ / c (no. 14), Z =4, M=497.94, D _calc. =2.313 gcm ^-3 , µ(MoKα)=2.729 mm ^-1 , λ=0.71073 Å, R ₁ =0.03, S =1.05.