ORCID Profile
0000-0003-2340-5302
Current Organisation
University of Oxford
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Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/CH19193
Abstract: A series of lanthanide chloranilate frameworks containing a (4,4)-net with LaIII, CeIII, NdIII, SmIII, and EuIII have been synthesised and structurally characterised. Two structure types of square grids were obtained for these frameworks. Type 1 consists of the formula (Et4N)[Ln(can)2(H2O)] (Ln=LaIII, CeIII, NdIII H2can=chloranilic acid) and crystallised in the tetragonal space group I4/m, featuring a nine-coordinate lanthanide ion with a coordinated water molecule and four chloranilate ligands. Type 2, (Et4N)[Ln(can)2] (SmIII and EuIII) crystallised in the I4/mcm space group, and contains an eight-coordinate lanthanide ion without a coordinated water molecule. A single-crystal-to-single-crystal transformation was carried out for (Et4N)[Nd(can)2(H2O)] on removal of the coordinated aqua ligand.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CE01172J
Abstract: The reaction of a semi-rigid chiral ligand with Co( ii ) and dipyridyl co-ligands of varying length yielded a series of 2D coordination frameworks, with the topology of the network mediated by the length of the co-ligands.
Publisher: Wiley
Date: 21-06-2023
Abstract: A series of heteroditopic halogen bonding (XB) [2]rotaxanes were prepared via a combination of passive and active metal template‐directed strategies. The ability of the [2]rotaxanes to bind alkali metal halide ion‐pairs was investigated by extensive 1 H NMR titration studies, wherein detailed analysis of cation, anion and ion‐pair affinity measurements indicate dramatic positive cooperative enhancements in halide anion association upon either Na + or K + pre‐complexation. This study demonstrates that careful consideration of multiple, parallel and competing binding equilibria is essential when interpreting observed 1 H NMR spectral changes in ion‐pair receptor systems, especially those which exhibit dynamic behaviour. Importantly, in comparison to XB [2]catenane analogues, these neutral XB heteroditopic [2]rotaxane host systems demonstrated that despite their relatively weaker cation and anion binding affinities, they exhibit a notably higher level of positive cooperativity for alkali metal halide ion‐pair binding, highlighting the role of greater co‐conformational adaptive behaviour in mechanically‐bonded hosts for the purposes of charged species recognition.
Publisher: American Chemical Society (ACS)
Date: 21-07-2020
Publisher: Wiley
Date: 20-12-2022
Abstract: The first ex les of halogen bonding (XB) heteroditopic homo[2]catenanes were prepared by discrete Na + template‐directed assembly of oligo(ethylene glycol) units derived from XB donor‐containing macrocycles and acyclic bis‐azide precursors, followed by a Cu I ‐mediated azide‐alkyne cycloaddition macrocyclisation reaction. Extensive 1 H NMR spectroscopic studies show the [2]catenane hosts exhibit positive cooperative ion‐pair recognition behaviour, wherein XB‐mediated halide recognition is enhanced by alkali metal cation pre‐complexation. Notably, subtle changes in the catenanes’ oligo(ethylene glycol) chain length dramatically alters their ion‐binding affinity, stoichiometry, complexation mode, and conformational dynamics. Solution‐phase and single‐crystal X‐ray diffraction studies provide evidence for competing host‐separated and direct‐contact ion‐pair binding modes. We further demonstrate the [2]catenanes are capable of extracting solid alkali‐metal halide salts into organic media.
Publisher: Wiley
Date: 20-12-2022
Abstract: The first ex les of halogen bonding (XB) heteroditopic homo[2]catenanes were prepared by discrete Na + template‐directed assembly of oligo(ethylene glycol) units derived from XB donor‐containing macrocycles and acyclic bis‐azide precursors, followed by a Cu I ‐mediated azide‐alkyne cycloaddition macrocyclisation reaction. Extensive 1 H NMR spectroscopic studies show the [2]catenane hosts exhibit positive cooperative ion‐pair recognition behaviour, wherein XB‐mediated halide recognition is enhanced by alkali metal cation pre‐complexation. Notably, subtle changes in the catenanes’ oligo(ethylene glycol) chain length dramatically alters their ion‐binding affinity, stoichiometry, complexation mode, and conformational dynamics. Solution‐phase and single‐crystal X‐ray diffraction studies provide evidence for competing host‐separated and direct‐contact ion‐pair binding modes. We further demonstrate the [2]catenanes are capable of extracting solid alkali‐metal halide salts into organic media.
Publisher: Elsevier BV
Date: 05-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CC05539E
Abstract: Solid-state 13 C NMR was used to differentiate the d - and l -enantiomers of three BOC-protected amino acids (Ala, Val, Pro) when appended to the chiral S -Mg 2 dobpdc MOF.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Hui Min Tay.