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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.


(a) Partial 1H NMR spectroscopy of G (6.0 mM each, CD3CN, 400 MHz, 298 K). (b)Partial 1H NMR spectroscopy of C4C5 reacted with G. (c) 1H NMR spectroscopy of K+ and C4C5, which indicated G release from the C4C5 by K+ interacted with crown ring with C4C5.
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f3: (a) Partial 1H NMR spectroscopy of G (6.0 mM each, CD3CN, 400 MHz, 298 K). (b)Partial 1H NMR spectroscopy of C4C5 reacted with G. (c) 1H NMR spectroscopy of K+ and C4C5, which indicated G release from the C4C5 by K+ interacted with crown ring with C4C5.

Mentions: To obtain insights into the mechanism, NMR experiments were carried out, 6.0 mM C4C5 and 1.0 equiv. of G and K+ in CD3CN, as showed in Fig. 3. The protons of the napthalene in the G underwent upfield shift of 0.05 ppm in the presence of C4C5. The result also indicated that the [C4C5+G] complex was successfully formed. When K+ added, the protons of naphthalene underwent an upfield shift of 0.05 ppm and recovered to original chemical shift, moreover, the protons of crown have underwent the protons of crown ether unit of C4C5 Ha, Hb, Hc and Hd underwent downfield shift of 0.04 ppm, 0.18 ppm, 0.14 ppm and 0.17 ppm respectively. According to the NMR, we deduced that before K+ was added, the crown ring of C4C5 was stretched, when K+ added, K+ entered into crown space, which made the lower space of crown become smaller and this reaction has made the space of the upper of the C4C5 become bigger and led to G released.


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) Partial 1H NMR spectroscopy of G (6.0 mM each, CD3CN, 400 MHz, 298 K). (b)Partial 1H NMR spectroscopy of C4C5 reacted with G. (c) 1H NMR spectroscopy of K+ and C4C5, which indicated G release from the C4C5 by K+ interacted with crown ring with C4C5.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: (a) Partial 1H NMR spectroscopy of G (6.0 mM each, CD3CN, 400 MHz, 298 K). (b)Partial 1H NMR spectroscopy of C4C5 reacted with G. (c) 1H NMR spectroscopy of K+ and C4C5, which indicated G release from the C4C5 by K+ interacted with crown ring with C4C5.
Mentions: To obtain insights into the mechanism, NMR experiments were carried out, 6.0 mM C4C5 and 1.0 equiv. of G and K+ in CD3CN, as showed in Fig. 3. The protons of the napthalene in the G underwent upfield shift of 0.05 ppm in the presence of C4C5. The result also indicated that the [C4C5+G] complex was successfully formed. When K+ added, the protons of naphthalene underwent an upfield shift of 0.05 ppm and recovered to original chemical shift, moreover, the protons of crown have underwent the protons of crown ether unit of C4C5 Ha, Hb, Hc and Hd underwent downfield shift of 0.04 ppm, 0.18 ppm, 0.14 ppm and 0.17 ppm respectively. According to the NMR, we deduced that before K+ was added, the crown ring of C4C5 was stretched, when K+ added, K+ entered into crown space, which made the lower space of crown become smaller and this reaction has made the space of the upper of the C4C5 become bigger and led to G released.

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.