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Issue 16, 2014
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A lanthanum chelate possessing an open-channel framework with water nanotubes: properties and desalination

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Abstract

A new type of thermally stable chelate {La(H2O)4[La(1,3-pdta)(H2O)]3}n·12nH2O (1) [1,3-H4pdta[double bond, length as m-dash]CH2[CH2N(CH2CO2H)2]2] with an open-channel shows significant and unusual solvent transport properties and demonstrates a use for low-pressure desalination, which is constructed by cheap and available lanthanum salt and 1,3-propanediaminetetraacetate. The chelate could be converted reversibly to its trihydrate {La(H2O)4[La(1,3-pdta)(H2O)]3}n·3nH2O (1a), dehydrated product {La(H2O)4[La(1,3-pdta)(H2O)]3}n (1b) and ethanol adduct {La(H2O)4[La(1,3-pdta)(H2O)]3}n·3nH2O·3nEtOH (1c). The latter nano-confined ethanol shows a remarkable downfield shift (Δδ = 6.0 ppm) for the methylene group in the solid 13C NMR spectrum compared with that of the free EtOH. Crystal 1 with a regular hexagonal appearance can be used directly for saline water desalination on a small-scale at an ambient temperature, demonstrating a low energy consumption and environmentally friendly method. This is attributed to the 10.0 Å hydrophobic open-channel containing water nanotubes (WNTs, Φ = 4.2 Å). The nano-confined WNTs can be removed at a low temperature (45 °C).

Graphical abstract: A lanthanum chelate possessing an open-channel framework with water nanotubes: properties and desalination

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Publication details

The article was received on 09 Oct 2013, accepted on 19 Nov 2013 and first published on 20 Nov 2013


Article type: Paper
DOI: 10.1039/C3DT52837E
Citation: Dalton Trans., 2014,43, 6026-6031
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    A lanthanum chelate possessing an open-channel framework with water nanotubes: properties and desalination

    M. Chen, Y. Guo, F. Yang, J. Liang, Z. Cao and Z. Zhou, Dalton Trans., 2014, 43, 6026
    DOI: 10.1039/C3DT52837E

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