The intercalation of 4-aminopyridine into layered FePS3

A new intercalation compound, Fe0.81PS3(4-aminopyridineH)(0.38), is synthesized by the direct reaction of 4-aminopyridine with layered FePS3 in the presence of acetic acid. From the XRD results it was found that there are two phases ( Phase I and Phase II) in this intercalation compound and that 4-aminopyridines as the guests adopt two different orientations between the interlayer region of the host (FePS3). In one of them with the lattice expansion (Deltad) of 6.0 Angstrom the ring plane of the guest is perpendicular to the layer and in the other with Deltad of 3.4 Angstrom the ring plane of the guest is parallel to the layer of the host. The IR spectra imply that the inserted guests take the protonated form to maintain the charge balance of the intercalation compound. Magnetic measurements indicate that Fe0.81PS3(4-aminopyridineH)(0.38) exhibits paramagnetism in the range of measurement temperature (1.8 similar to 300 K), where the magnetic behavior is well in agreement with the Curie-Weiss Law above 55 K.