Near IR-emitting DNA-probes exploiting stepwise energy transfer processes

Andras Bodi; K. Eszter Borbas; James I. Bruce

doi:10.1039/B708940F

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Dalton Transactions

Issue 38, 2007

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Near IR-emitting DNA-probes exploiting stepwise energy transfer processes

Andras Bodi , K. Eszter Borbas and James I. Bruce

Dalton Trans., 2007, 4352-4358

DOI: 10.1039/B708940F
Received 13 Jun 2007, Accepted 20 Jul 2007
First published on the web 14 Aug 2007

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Abstract
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The synthesis and characterisation of two new cyclen-based near IR-emitting lanthanide complexes is reported; the lanthanides are sensitised by rhodamine, which in turn is excited by energy transfer from a coumarin 2 moiety. The three lumophores function as an energy transfer cascade spanning the UV-visible-near IR region of the spectrum, resulting in large Stokes shifts. Double stranded DNA selectively switches one of the two energy transfer processes off, enabling luminescent DNA-sensing in the near IR region. The regioselective di-alkylation of the cyclen scaffold is explained with the help of DFT calculations.

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Emission spectrum of Yb1, B3LYP/6-31G(d,p) optimized geometries in Cartesian coordinates (?) for selected conformers of 4, absorption, excitation and emission spectra of 1 in CH ₂Cl ₂
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Near IR-emitting DNA-probes exploiting stepwise energy transfer processes

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