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Electrophysiology of Scorpion Peg Sensilla

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Controllable Intramolecular Motions That Generate Fluorescent Signals for a Metal Scorpionate Complex.

Luigi Fabbrizzi¹, Maurizio Licchelli¹, Piersandro Pallavicini¹

¹Dipartimento di Chimica Generale, Università di Pavia, via Taramelli 12, I-27100 Pavia (Italy), Fax: (+39) 382-528-544.

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Summary

Changing pH levels controls a complex

Keywords:

Electron transfer Fluorescence Macrocycles Molecular devices Nickel

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Published on: December 16, 2013

Area of Science:

Supramolecular chemistry
Coordination chemistry

Background:

Fluorescent molecular switches are crucial for sensing applications.
Complex 1 exhibits pH-dependent conformational changes.

Purpose of the Study:

To investigate the pH-responsive behavior of complex 1.
To characterize complex 1 as a molecular switch.

Main Methods:

pH titration
Fluorescence spectroscopy

Main Results:

Complex 1 exhibits reversible positional changes in its side chain.
Fluorescence intensity decreases from 100% to 60% at moderate pH.
Further fluorescence quenching to ≤2% occurs at higher pH.

Conclusions:

Complex 1 functions as a three-position molecular switch.
The pH-induced fluorescence changes enable distinct states.