Abstract
Various aspects of the adsorption of Cd 2+ on self-assembled monolayers (SAMs) of 4-heptadecylpyridine (HDpy) and 7-tridecyl-4-methyl-l,10- bipyridine (TMbipy) supported on an octadecylsilane (ODS)-modified Ge prism, have been examined both ex situ (dry) and in situ (in the presence of aqueous solutions) using attenuated total reflection Fourier transform infrared spectroscopy. In direct analogy with the behavior found for a variety of genuine pyridine (py) and bipyridine (bipy) metal ion complexes, Cd 2+ binding to both SAMs led to shifts in the skeletal vibrational modes of the corresponding uncoordinated ligands in the region 1650-1400 cm -1, toward higher energies. Analysis of spectra acquired ex situ for HDpy/ODS/Ge and TMbipy/ODS/Ge before and after exposure to 0.1 mM [Cd 2+] yielded values for the fraction of uncoordinated py, θ(py un), and uncoordinated bipy, θ(bipy un), of about 0.5 and about 0.1, respectively. The features attributed to the py un groups for spectra collected for HDpy/ODS/Ge in situ and ex situ were found to be virtually identical, making it possible to isolate by graphical means the most prominent band of py co centered at about 1615 cm -1 for HDpy/ODS/Ge collected in situ. The resulting bands for pure py co and py un in situ were then used to deconvolute spectra recorded in situ for HPpy/ODS/Ge in contact with Cd 2+containing solutions in the range 10 nM < [Cd 2+] < 0.1 mM, from which information regarding the adsorption isotherm was obtained.
| Original language | English |
|---|---|
| Pages (from-to) | 4498-4502 |
| Number of pages | 5 |
| Journal | Langmuir |
| Volume | 20 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2004 May 25 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Spectroscopy
- Electrochemistry
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Binding of Cd 2+ to self-assembled bilayers bearing pyridine terminal groups : Attenuated total reflection fourier transform infrared spectroscopic studies. / Burshtain, Doron; Wu, Jun; Melman, Artem; Handler, Daniel; Scherson, Daniel Alberto.
In: Langmuir, Vol. 20, No. 11, 25.05.2004, p. 4498-4502.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Binding of Cd 2+ to self-assembled bilayers bearing pyridine terminal groups
T2 - Attenuated total reflection fourier transform infrared spectroscopic studies
AU - Burshtain, Doron
AU - Wu, Jun
AU - Melman, Artem
AU - Handler, Daniel
AU - Scherson, Daniel Alberto
PY - 2004/5/25
Y1 - 2004/5/25
N2 - Various aspects of the adsorption of Cd 2+ on self-assembled monolayers (SAMs) of 4-heptadecylpyridine (HDpy) and 7-tridecyl-4-methyl-l,10- bipyridine (TMbipy) supported on an octadecylsilane (ODS)-modified Ge prism, have been examined both ex situ (dry) and in situ (in the presence of aqueous solutions) using attenuated total reflection Fourier transform infrared spectroscopy. In direct analogy with the behavior found for a variety of genuine pyridine (py) and bipyridine (bipy) metal ion complexes, Cd 2+ binding to both SAMs led to shifts in the skeletal vibrational modes of the corresponding uncoordinated ligands in the region 1650-1400 cm -1, toward higher energies. Analysis of spectra acquired ex situ for HDpy/ODS/Ge and TMbipy/ODS/Ge before and after exposure to 0.1 mM [Cd 2+] yielded values for the fraction of uncoordinated py, θ(py un), and uncoordinated bipy, θ(bipy un), of about 0.5 and about 0.1, respectively. The features attributed to the py un groups for spectra collected for HDpy/ODS/Ge in situ and ex situ were found to be virtually identical, making it possible to isolate by graphical means the most prominent band of py co centered at about 1615 cm -1 for HDpy/ODS/Ge collected in situ. The resulting bands for pure py co and py un in situ were then used to deconvolute spectra recorded in situ for HPpy/ODS/Ge in contact with Cd 2+containing solutions in the range 10 nM < [Cd 2+] < 0.1 mM, from which information regarding the adsorption isotherm was obtained.
AB - Various aspects of the adsorption of Cd 2+ on self-assembled monolayers (SAMs) of 4-heptadecylpyridine (HDpy) and 7-tridecyl-4-methyl-l,10- bipyridine (TMbipy) supported on an octadecylsilane (ODS)-modified Ge prism, have been examined both ex situ (dry) and in situ (in the presence of aqueous solutions) using attenuated total reflection Fourier transform infrared spectroscopy. In direct analogy with the behavior found for a variety of genuine pyridine (py) and bipyridine (bipy) metal ion complexes, Cd 2+ binding to both SAMs led to shifts in the skeletal vibrational modes of the corresponding uncoordinated ligands in the region 1650-1400 cm -1, toward higher energies. Analysis of spectra acquired ex situ for HDpy/ODS/Ge and TMbipy/ODS/Ge before and after exposure to 0.1 mM [Cd 2+] yielded values for the fraction of uncoordinated py, θ(py un), and uncoordinated bipy, θ(bipy un), of about 0.5 and about 0.1, respectively. The features attributed to the py un groups for spectra collected for HDpy/ODS/Ge in situ and ex situ were found to be virtually identical, making it possible to isolate by graphical means the most prominent band of py co centered at about 1615 cm -1 for HDpy/ODS/Ge collected in situ. The resulting bands for pure py co and py un in situ were then used to deconvolute spectra recorded in situ for HPpy/ODS/Ge in contact with Cd 2+containing solutions in the range 10 nM < [Cd 2+] < 0.1 mM, from which information regarding the adsorption isotherm was obtained.
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U2 - 10.1021/la036133q
DO - 10.1021/la036133q
M3 - Article
C2 - 15969157
AN - SCOPUS:2942532806
VL - 20
SP - 4498
EP - 4502
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 11
ER -