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Issue 6, 2006
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Isomer selective ion-exchange intercalation of nitrophenolates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

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Abstract

The anions 4-nitrophenolate (4-NP) and 2,4-dinitrophenolate (2,4-DNP) undergo anion-exchange intercalation with [LiAl2(OH)6]Cl·xH2O, ([Li-Al-Cl] LDH), to yield the fully exchanged intercalates [LiAl2(OH)6]{4-NP}·2H2O and [LiAl2(OH)6]{2,4-DNP}·H2O respectively. 4-NP can be selectively intercalated in [Li-Al-Cl] LDH from an equimolar mixture of 2-nitrophenolate (2-NP), 3-nitrophenolate (3-NP) and 4-nitrophenolate (4-NP). Intercalation of 2,4-DNP is competitive with intercalation of 4-NP into [Li-Al-Cl] LDH from an equimolar solution of the two NPs. The observed intercalation preferences of these two NPs is found to be dependent on both temperature and solvent. 2,4-DNP is selectively intercalated into [Li-Al-Cl] LDH compared to 4-NP at high temperature and in polar solvents. The kinetics of intercalation of 4-NP and 2,4-DNP into [Li-Al-Cl] LDH has been studied using time-resolved in situ energy dispersive X-ray powder diffraction (EDXRD). The rate of intercalation of 4-NP is faster that of 2,4-DNP, but 2,4-DNP is thermodynamically preferred by [Li-Al-Cl] LDH.

Graphical abstract: Isomer selective ion-exchange intercalation of nitrophenolates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

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Publication details

The article was received on 14 Oct 2005, accepted on 11 Nov 2005 and first published on 07 Dec 2005


Article type: Paper
DOI: 10.1039/B514638K
Citation: J. Mater. Chem., 2006,16, 602-608
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    Isomer selective ion-exchange intercalation of nitrophenolates into the layered double hydroxide [LiAl2(OH)6]Cl·xH2O

    A. Ragavan, A. I. Khan and D. O'Hare, J. Mater. Chem., 2006, 16, 602
    DOI: 10.1039/B514638K

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