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Cation-induced pesticide binding and release by a functionalized calix[4]arene molecular host.

Luo L, Zhang X, Feng N, Tian D, Deng H, Li H - Sci Rep (2015)

Bottom Line: Ion-controlled switchable progress is very important in many biological behaviors.Here, we reported K(+)-controlled switch, this switch system exhibited excellent carbaryl (G) binding/release by fluorescent (FL), ultraviolet-visible (UV) spectrums and (1)H NMR spectroscopy.More importantly, the K(+)-controlled G binding/release switch based on C4C5 not only in the solution, but also on the surface, promising for the application for the pesticide controlled release.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079 (P. R. China).

ABSTRACT
Ion-controlled switchable progress is very important in many biological behaviors. Here, we reported K(+)-controlled switch, this switch system exhibited excellent carbaryl (G) binding/release by fluorescent (FL), ultraviolet-visible (UV) spectrums and (1)H NMR spectroscopy. More importantly, the K(+)-controlled G binding/release switch based on C4C5 not only in the solution, but also on the surface, promising for the application for the pesticide controlled release.

No MeSH data available.


Related in: MedlinePlus

(a) CA relationship images for C4C5 SAMs with G, K+, 18C6. (b) Cycling experiment of K+-ion controlled switch which indicate a good reversibility between hydrophobicity and hydrophilicity.
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f7: (a) CA relationship images for C4C5 SAMs with G, K+, 18C6. (b) Cycling experiment of K+-ion controlled switch which indicate a good reversibility between hydrophobicity and hydrophilicity.

Mentions: Through the SEM (Supplementary Fig. S13), the rough substrate exhibited a regular array of square silicon micro convexes (bright squares), and then the C4C5-modified substrate showed a thin film on the surface. Comparing SEM image of the rough surface before and after modification with C4C5, these results indicated that C4C5 was successfully modified on the silicon surface. From XPS (Supplementary Fig. S14), the concentration of carbon had a significant increase and the concentration of oxygen had an obvious decrease. Moreover, the water-drop profiles showed a different CAs on bare silicon surface. This also proved the above conclusion. The silicon surface was immersed into G solution (1.0 × 10−3 M), after 15 min the silicon wafer was washed by little water to remove the residue G, dried by nitrogen and measured. The results showed in Figure 7a, C4C5 SAMs immersed into G the CA became from superhydrophobic to hydrophilic, which was only 22.8 ± 3.0°, however, when immersed into KClO3 solution (1.0 × 10−3 M) and 18C6 solution (1.0 × 10−3 M) respectively, the wettability of the surface recovered to their original values (150.0 ± 3.0°). Because G interacted with C4C5 and the group of CONH was exposed, which made the surface become hydrophilicity, nevertheless, K+ formed complex with C4C5 and made G released from the space and left the tertiary butyl, which led to the surface become superhydrophility again. 18C6 interacting with K+ didn't change the property of the upper rim of C4C5, so the wettability remained superhydrophobicity (Supplementary Fig. S15).


Cation-induced pesticide binding and release by a functionalized calix[4]arene molecular host.

Luo L, Zhang X, Feng N, Tian D, Deng H, Li H - Sci Rep (2015)

(a) CA relationship images for C4C5 SAMs with G, K+, 18C6. (b) Cycling experiment of K+-ion controlled switch which indicate a good reversibility between hydrophobicity and hydrophilicity.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4355745&req=5

f7: (a) CA relationship images for C4C5 SAMs with G, K+, 18C6. (b) Cycling experiment of K+-ion controlled switch which indicate a good reversibility between hydrophobicity and hydrophilicity.
Mentions: Through the SEM (Supplementary Fig. S13), the rough substrate exhibited a regular array of square silicon micro convexes (bright squares), and then the C4C5-modified substrate showed a thin film on the surface. Comparing SEM image of the rough surface before and after modification with C4C5, these results indicated that C4C5 was successfully modified on the silicon surface. From XPS (Supplementary Fig. S14), the concentration of carbon had a significant increase and the concentration of oxygen had an obvious decrease. Moreover, the water-drop profiles showed a different CAs on bare silicon surface. This also proved the above conclusion. The silicon surface was immersed into G solution (1.0 × 10−3 M), after 15 min the silicon wafer was washed by little water to remove the residue G, dried by nitrogen and measured. The results showed in Figure 7a, C4C5 SAMs immersed into G the CA became from superhydrophobic to hydrophilic, which was only 22.8 ± 3.0°, however, when immersed into KClO3 solution (1.0 × 10−3 M) and 18C6 solution (1.0 × 10−3 M) respectively, the wettability of the surface recovered to their original values (150.0 ± 3.0°). Because G interacted with C4C5 and the group of CONH was exposed, which made the surface become hydrophilicity, nevertheless, K+ formed complex with C4C5 and made G released from the space and left the tertiary butyl, which led to the surface become superhydrophility again. 18C6 interacting with K+ didn't change the property of the upper rim of C4C5, so the wettability remained superhydrophobicity (Supplementary Fig. S15).

Bottom Line: Ion-controlled switchable progress is very important in many biological behaviors.Here, we reported K(+)-controlled switch, this switch system exhibited excellent carbaryl (G) binding/release by fluorescent (FL), ultraviolet-visible (UV) spectrums and (1)H NMR spectroscopy.More importantly, the K(+)-controlled G binding/release switch based on C4C5 not only in the solution, but also on the surface, promising for the application for the pesticide controlled release.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079 (P. R. China).

ABSTRACT
Ion-controlled switchable progress is very important in many biological behaviors. Here, we reported K(+)-controlled switch, this switch system exhibited excellent carbaryl (G) binding/release by fluorescent (FL), ultraviolet-visible (UV) spectrums and (1)H NMR spectroscopy. More importantly, the K(+)-controlled G binding/release switch based on C4C5 not only in the solution, but also on the surface, promising for the application for the pesticide controlled release.

No MeSH data available.


Related in: MedlinePlus