Investigation of methylamine interaclated FePS_3

摘要

The ~(57)Fe Mossbauer spectroscopic results of methylamine intercalated layered FePS_3 following the removal of the guest species from the initial intercalate in steps by heating at three different stages are presented. The initial intercalate described as [FePS_(3-x)O_x]~(2x-) [CH_3NH_3]_(2x)~+ (CH_3NH_2)_y (H_2O)_z with x = 0.65 has the host lattice of FePS_3 modified through substitution of sulphur by oxygen due to intercalation of amine in aqueous medium and the neutral molecules, viz., water and methylamine solvating the ionised methylamine guest [CH_3NH_3]~+. The present Mossbauer results show that when the guest species are removed by heating, 15% delocalised electrons present in the initial intercalate, get localised at the iron centres of the host. The most interesting feature of the Mossbauer result is the detection of a new kind of intercalation process wherein in situ generation of large amount of ionised amines takes place when the initial intercalate is simply heated above 100 deg C.