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Carbazole-Functionalized Dipicolinato Ln Complexes Show Two-Photon Excitation and Viscosity-Sensitive Metal-Centered Emission.
J Lumin
May 2022
Department of Chemistry, University of Nevada, Reno, NV, 89557 United States.
Eu and Yb complexes with the carbazole-dipicolinato ligand dpaCbz, namely K[Eu(dpaCbz)] and K[Yb(dpaCbz)], were isolated. The Eu complex displayed metal-centred emission upon one-photon excitation with a sensitized emission efficiency of 1.8±0.
View Article and Find Full Text PDFUltrafast and efficient energy transfer in a one- and two-photon sensitized rhodamine-BODIPY dyad: a perspective for broadly absorbing photocages.
Phys Chem Chem Phys
January 2022
Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Straße 7, 60438 Frankfurt am Main, Germany.
In view of the demand for photoactivatable probes that operate in the visible (VIS) to near infrared (NIR) region of the spectrum, we designed a bichromophoric system based on a rhodamine fluorophore and a BODIPY photocage. Two-photon excited fluorescence (TPEF) measurements and quantum chemical calculations reveal excellent two-photon properties of the employed rhodamine derivative. Excitation of the rhodamine unit a one- or two-photon process leads to excitation energy transfer (EET) onto the BODIPY part, which is followed by the liberation of the leaving group.
View Article and Find Full Text PDFVersatile rare-earth oxide nanocomposites: enhanced chemo/photothermal/photodynamic anticancer therapy and multimodal imaging.
J Mater Chem B
December 2016
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
The development of novel nanocomposites that combine multiple imaging and therapeutic strategies has recently attracted considerable attention because of their cumulative and synergistic therapeutic effects. In this study, doxorubicin (DOX)- and indocyanine green (ICG)-loaded GdO:Eu@P(NIPAm-co-MAA)@THA@cRGD nanocomposites {abbreviated as DOX-ICG-TPNPs@cRGD; P(NIPAm-co-MAA): poly[(N-isopropylacrylamide)-co-(methacrylic acid)]; THA: 4,4-trifluoro-1-(9-pentylcarbazole-3-yl)-1,3-butanedione; cRGD: cyclic(Arg-Gly-Asp-d-Phe-Lys)} were designed, assembled, fully characterized, and successfully applied in multimodal imaging diagnosis and therapy. The designed nanocomposites display a versatile, multifunctional platform that includes (a) simultaneous targeting with cRGD, (b) multimodal imaging, including two-photon luminescence (TPL), magnetic resonance imaging (MRI), computed tomography (CT), and photothermal imaging (PTI), and (c) stimuli-responsive coordinated drug delivery; this results in a highly efficient synergistic chemo/photothermal/photodynamic anticancer therapy (chemo/PTT/PDT).
View Article and Find Full Text PDFPoly β-cyclodextrin/TPdye nanomicelle-based two-photon nanoprobe for caspase-3 activation imaging in live cells and tissues.
Anal Chem
November 2014
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
Two-photon excitation (TPE) with near-infrared (NIR) photons as the excitation source has important advantages over conventional one-photon excitation (OPE) in the field of biomedical imaging. β-cyclodextrin polymer (βCDP)-based two-photon absorption (TPA) fluorescent nanomicelle exhibits desirable two-photon-sensitized fluorescence properties, high photostability, high cell-permeability and excellent biocompatibility. By combination of the nanostructured two-photon dye (TPdye)/βCDP nanomicelle with the TPE technique, herein we have designed a TPdye/βCDP nanomicelle-based TPA fluorescent nanoconjugate for enzymatic activity assay in biological fluids, live cells and tissues.
View Article and Find Full Text PDFTwo-photon sensitized visible and near-IR luminescence of lanthanide complexes using a fluorene-based donor-π-acceptor diketonate.
Dalton Trans
November 2014
Department of Chemistry, University of Central Florida, Orlando, FL 32816-2366, USA.
A fluorene-based donor-acceptor ligand was successfully employed to sensitize visible and near-IR emitting lanthanide centers. The ligand construct is based on a donor-π-acceptor architecture with diphenylamino acting as the donor and a fluorenyl π bridge derivatized with a trifluoroacetonate moiety acting as both a strong acceptor and the classic bidentate scaffold for complexing metals. (1)H NMR analysis in the polar solvents THF and CDCl3 revealed the enolic form of the diketone dominant in solution equilibria at room temperature.
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