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Interfacial Binding of Divalent Cations to Calixarene-Based Langmuir Monolayers

Tulli, Ludovico G. and Wang, Wenjie and Lindemann, William R. and Kuzmenko, Ivan and Meier, Wolfgang and Vaknin, David and Shahgaldian, Patrick. (2015) Interfacial Binding of Divalent Cations to Calixarene-Based Langmuir Monolayers. Langmuir, 31 (8). pp. 2351-2359.

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Official URL: http://edoc.unibas.ch/40703/

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Abstract

The interactions of Langmuir monolayers produced through the self-assembly of an amphiphilic p-carboxycalix[4]arene (1) with a series of divalent, fourth-period transition metals, at the air–water interface, were investigated. Changes in the interfacial behavior of 1 in response to the presence of CuCl2, CoCl2, MnCl2, and NiCl2 were studied by means of Langmuir compression isotherms and Brewster angle microscopy (BAM). The measurements revealed that the self-assembly properties of 1 are significantly affected by Cu2+ ions. The interactions of 1-based monolayers with Co2+ and Cu2+ ions were further investigated by means of synchrotron radiation-based X-ray reflectivity (XRR), X-ray near-total-reflection fluorescence (XNTRF), and grazing incidence X-ray diffraction (GIXD). XNTRF and XRR analyses revealed that the monolayer of 1 binds more strongly to Cu2+ than Co2+ ions. In the presence of relatively high concentrations of Cu2+ ions in the subphase (1.4 × 10–3 M), XNTRF exhibited anomalous depth profile behavior and GIXD measurements showed considerably strong diffuse scattering. Both measurements suggest the formation of Cu2+ clusters contiguous to the monolayer of 1.
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Chemie > Makromolekulare Chemie (Meier)
UniBasel Contributors:Meier, Wolfgang P.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:1520-5827
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:10 May 2016 13:15

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