Layered cobalt phosphates by the amine phosphate route

Abstract

Two layered cobalt phosphates, I, [NH3CH2CH(OH) CH2NH3][Co2(PO4)2], and II, [NH3CH2CH(OH)CH2NH3] [Co2(HPO4)3], have been hydrothermally synthesized employing the reaction of 1,3-diammonium-2-hydroxy propane with CoII 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) Å3, space group=Pbcn (no. 60), Z=8, M=399.87, Dcalc.=2.287 gcm−3, μ(MoKα)=3.176 mm−1, λ=0.71073 Å, R1=0.06, S=1.27; II, monoclinic, a=8.608(3), b=9.640(3), c=17.258(2) Å, β=93.23(1)°, V=1429.9(2) Å3, space group=P21/c (no. 14), Z=4, M=497.94, Dcalc.=2.313 gcm−3, μ(MoKα)=2.729 mm-1, λ=0.71073 Å, R1=0.03, S=1.05.