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Elucidating the Mechanism of Zn2+ Sensing by a Bipyridine Probe Based on Two-Photon Absorption
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi.ORCID-id: 0000-0003-0185-5724
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2016 (engelsk)Inngår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 120, nr 34, s. 9067-9075Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this work, we examine, by means of computational methods, the mechanism of Zn2+ sensing by a bipyridine-centered, D-pi-A-pi-D-type-ratiometric molecular probe. According to recently published experimental data [Divya, K. P.; Sreejith, S.; Ashokkumar, P.; Yuzhan, K.; Peng, Q; Maji, S. K.; Tong, Y.; Yu, H.; Zhao, Y.; Ramamurthy, P.; Ajayaghosh, A. A ratiometric fluorescent molecular -probe with enhanced two-photon response upon Zn2+ binding for in vitro and in vivo: bioimaging.= Chem. Sci. 2014, S, 3469-3474], after coordination to zinc ions the -probe exhibits a large enhancement of the two -photon absorption cross section. The goal of our investigation was to elucidate the mechanism behind this phenomenon. For this purpose, linear and nonlinear optical properties of -the unbound (cation-free) and bound probe were calculated, including the influence of solute Solvent interactions, implicitly using a polarizable continuum model and exp-licitely employing the QM/MM approach. Because the results of the calculations indicate that many conformers of the probe are energetically accessible at room temperature in solution and hence contribute to the Signal, structurepteperty relationships were also taken into account. Results of our simulations-demonstrate that the one-photon absorption bands for both the unbound -and bound forms correspond to the bright pi -> pi* transition to the first excited state; which, on the other hand,. exhibits negligible two-photon activity. On the basis of the results of the quadratic respOnse calculations, we put forward-notion that it is the second excited state that gives the strong signal in the experimental nonlinear spectrum. To explain the differenCes in the two-photon absorption activity for the two lowest-lying excited states and nonlinear response enhancement upon binding, we employed the generalized few -state model including the ground, first, and- second excited states. The analysis of the optical channel suggests that the large two-photon response is due to the coordination -induced increase of the, transition- moment from the first to the second excited state.

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American Chemical Society (ACS), 2016. Vol. 120, nr 34, s. 9067-9075
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Identifikatorer
URN: urn:nbn:se:kth:diva-193821DOI: 10.1021/acs.jpcb.6b04949ISI: 000382596700031PubMedID: 27494451Scopus ID: 2-s2.0-84985001800OAI: oai:DiVA.org:kth-193821DiVA, id: diva2:1038577
Forskningsfinansiär
Swedish Research CouncilCarl Tryggers foundation
Merknad

QC 20161019

Tilgjengelig fra: 2016-10-19 Laget: 2016-10-11 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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