Investigtions of few layer MOF's and anion substituted chromium (III) oxide

Abstract

Layered metal-organic frameworks viz.[(C10H13O3P)Co(H2O)], [Cu(C8H10O3P)2]n, [Cu6(H2L)3(H2O)10]n.4H2O, [(C10H13O3P)Ni(H2O)], [(C10H13O3P)Cu(H2O)] and [Cu(C6H10O3P)].H2O in which the two dimensional layers are connected to each other by weak van der waal interactions were studied. Few layer nanosheets of these materials were prepared by using a top-down approach. We have exfoliated these materials by simple and cost effective ultrasonication method to obtain the nanosheets. The nanosheets thus obtained were characterized with the help of atomic force microscopy. Nanosheets as thin as 3 nm were obtained. Variation in thickness and lateral dimension of the nanosheets with different duration of ultrasonication were investigated and was found that the thickness as well as lateral dimension of the nanosheets decreases with the increase in duration of ultrasonication. We have investigated the variation in magnetic properties of the nanosheets of [(C10H13O3P)Co(H2O)] and [(C10H13O3P)Ni(H2O)] . Antiferromagnetic ordering which was present in the bulk phase disappears on exfoliation into few layers.