Effect of crown ether lipophilicity on the facilitated transport of guanidinium thiocyanate through an immobilized liquid membrane

Stolwijk, Theodorus B.; Sudhölter, Ernst J. R.; Reinhoudt, David N.

doi:10.1021/ja00198a050

Cited by 45 publications

(10 citation statements)

References 6 publications

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“…The comparison between logP for the three different solvent systems shows that the results obtained in the present work using NPOE are between the values obtained with octanol and DCE as the oil phase. This observation correlate rather well with previous investigations in which an empirical relation between logP NPOE and logP OCT was put forward (27). A more exact theoretical analysis is complicated due to the complexity involved in a thorough and detailed description of solvation phenomena.…”

Section: Ion Partition Diagramssupporting

confidence: 91%

Untitled

Ulmeanu

Jensen

Bouchard

et al. 2003

Pharmaceutical Research

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Section: Ion Partition Diagramssupporting

confidence: 91%

Untitled

Ulmeanu

Jensen

Bouchard

et al. 2003

Pharmaceutical Research

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“…However, for any application in chemical sensors the membrane stability must be increased markedly. The attachment of long alkyl chains to increase the hydrophobicity [14] of the compound or its immobilization in the membrane [15] might be envisaged.…”

Section: Resultsmentioning

confidence: 99%

Concave carrier molecules: selective transport of copper(II) and lead(II) nitrates through supported liquid membranes

König¹,

Fricke

Lüning

et al. 1999

J. prakt. Chem.

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Ion-selective electrodes [1] are used as chemical sensors for many analytical applications. Their selectivity originates from mediated transport of ions through a hydrophobic membrane. The transport selectivity, however, is generally determined by a substrate-specific receptor molecule present in the membrane, where it can act as a carrier between source and receiving aqueous phase. Most of the work with artificial membranes has been focused on carrier-facilitated transport of metal cations by macrocyclic receptors, and many data from transport experiments under various conditions are avail- Abstract. Concave 1,10-phenanthrolines 1 are selective and efficient carrier molecules for membrane transport of copper(II) and lead(II) ions. With competitive membrane transport experiments the selectivity patterns of three concave 1,10-phenanthroline membrane carriers have been determined. Measurements with copper(II) and lead(II) nitrates confirmed the predicted selectivities and revealed high transport rates here membrane transport properties of concave 1,10-phenanthrolines [3], which posses the structural requirements to act as selective carriers for transition metal ions: 1,10-phenanthroline is a well known ligand for binding of transition metal cations, and we expect the concave shielding to keep the metal ion binding reversible and to provide binding selectivity. Results and DiscussionAlthough the rate of cation cotransport for a new carrier molecule can be predicted if only one cation is involved [4] this is certainly difficult for unusual structures, such as concave 1,10-phenanthrolines. To facilitate the testing of transport selectivities of new carrier molecules towards several cations we have recently introduced a new method [5] by which a competitive cation transport is monitored with simultaneous element analysis by inductively coupled plasma optical emission spectroscopy (ICP-OES) [6]. A single experiment of this kind reveals the transport selectivity of a carrier towards several cations. With a set of ten metal nitrates, including alkali, alkali earth and transition metal cations in the source phase, the membrane transport ability for 1a and 1b. While 1b shows a high preference for copper(II) nitrate, 1a transports lead and copper nitrates equally well, but with much higher flux. In bulk liquid membranes, the carrier mediated ion flux remained constant over an extended period, whereas it decreased significantly in reused supported liquid membranes, which indicates rapid loss of carrier from the membrane under these conditions.

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“…To obtain TBBC-D9, TBC-D9 was first synthesized following the procedure reported for the preparation of the protonated analogue [23]. Briefly, catechol was alkylated at position 4 with tert-butanol-D10 under acidic conditions of trifluoroacetic acid-D and D2SO4.…”

Section: Tbbc-d9mentioning

confidence: 99%

Polymerization Inhibitors and Promoters for Unsaturated Polyester Resins; Use of Solid Phase MicroExtraction and Gas Chromatography Coupled to Mass Spectrometry for the Determination of 4-tert-Butyl Catechol and Acetylacetone

Dugheri¹,

Gentili²,

Bonari³

et al. 2017

Eurasian J Anal Chem

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This paper reports a contribution of three on-sample derivatization sampling techniques for acetylacetone, 4-tert-butyl catechol and its oxidated derivatives 4-tert-butyl-1,2-benzoquinone determination in unsaturated polyester resins. The use of O- (2,3,4,5,6, pentafluorobenzyl)-hydroxylamine, trimethyloxonium tetrafluoroborate and O-methylhydroxylamine is combined with automated head space/solid phase microextraction and gas chromatography/mass spectrometry analysis. For an innovative powerful meaning in high-throughput routine, the generality of the structurally informative mass spectrometry fragmentation patterns together with the chromatographic separation are also investigated. The detection limits for these polymerization inhibitors and promoters are less than 27 pg for one mg of unsaturated polyester resin. In this study a new autosampler platform is proposed by using the Multi Fiber Exchange device in a xyz robotic system. We promote these methods as the analytical reference in the polyester resin field. The introduction of dedicated, automated, and robotic systems allowed a friendly use of MS apparatus for high-throughput screening and it reduces the costs of monitoring campaigns.

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Effect of crown ether lipophilicity on the facilitated transport of guanidinium thiocyanate through an immobilized liquid membrane

Cited by 45 publications

References 6 publications

Untitled

Untitled

Concave carrier molecules: selective transport of copper(II) and lead(II) nitrates through supported liquid membranes

Polymerization Inhibitors and Promoters for Unsaturated Polyester Resins; Use of Solid Phase MicroExtraction and Gas Chromatography Coupled to Mass Spectrometry for the Determination of 4-tert-Butyl Catechol and Acetylacetone

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