Intercalation of alkylamines into layered copper phosphonates
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Dehydration of layered copper phosphonates Cu(O3PR)·H2O (R = CH3, C6H5, CH2C6H5) yields layered anhydrous salts Cu(O3PR) which show an increase of more than 1 Å in interlayer spacing compared to its monohydrate. Primary amines CnH2n+1NH2 (n = 3–8) were intercalated into anhydrous Cu(O3PCH3) and Cu(O3PC6H5). The copper methylphosphonate takes up 1 mol of amine forming Cu(O3PCH3)·(RNH2), while 2 mol of amines were absorbed by copper phenylphosphonate. A plot of the interlayer distances of the intercalates vs the number of carbon atoms in the alkyl chain gives a straight line with a slope of 2.01 Å, which indicates that the alkyl chains of amine are packed as double layers with a tilt angle of 53° with respect to the mean plane of the layer. The behavior of copper phosphonates was compared to those of Mn, Co, and Zn phosphonates. © 1993, American Chemical Society. All rights reserved.
author list (cited authors)
Zhang, Y., Scott, K. J., & Clearfield, A.