Multiplexing, time-resolution, FRET…lanthanide-based biolabels reveal exceptional spectroscopic properties for bioanalytical applications.

Addition of Tb3+ salts to a solution (YbLD) complex in D2O resulted the formation [(YbLD)2Tbx] (x = 1 3) complexes that, upon NIR excitation at 980 nm, showed an unprecedented Yb Tb upconversion sensitization phenomenon resulting observation typical green emission Tb.

Piling up excited states to reach upconversion (UC) is severely restricted by vibrational quenching mechanisms, especially when one looks at discrete molecular entities in solution. By carefully controlling the supramolecular assembly processes resulting from strong electrostatic interactions between negatively charged Yb complexes and Tb3+ cations aqueous solutions, we engineered formation of heteropolynuclear [(YbL)2Tb x] compositions ( x = 1 2). These edifices display a phenomenon...

Up conversion is an Anti-Stokes luminescent process by which photons of low energy are piled up to generate light at a higher energy. Here we show that the addition fluoride anions D2O solution macrocyclic erbium complex leads formation supramolecular [(ErL)2F](+) assembly in sandwiched between two complexes, held together synergistic interactions Er-F-Er bridging bond, four intercomplex hydrogen bonds and aromatic stacking interactions. Room temperature excitation into Er absorption bands...

The search for more biocompatible alternatives to Gd3+ -based MRI agents, and the interest in 52 Mn PET imaging call ligands that form inert Mn2+ chelates. Given labile nature of , high inertness is challenging achieve. strongly preorganized structure 2,4-pyridyl-disubstituted bispidol ligand L1 endows its complex with exceptional kinetic inertness. Indeed, MnL1 did not show any dissociation 140 days presence 50 equiv. Zn2+ (37 °C, pH 6), while recently reported potential agents MnPyC3A...

Lanthanide metal clusters excel in combining molecular and material chemistry properties. Here, we report an efficient cooperative sensitization UC phenomenon of a Eu3+/Yb3+ nonanuclear lanthanide cluster CD3OD. The synthesis characterization the heteronuclear solid state solution are described together with showing Eu3+ luminescence visible region upon 980 nm NIR excitation Yb3+ at concentrations as low 100 nM. Alongside being Eu/Yb to display (with quantum yield value 4.88 × 10–8 1.13 W...

Abstract The new potentially octadentate ligand, 1‐(carboxymethyl)‐4,7‐bis[(6‐carboxypyridin‐2‐yl)methyl]‐1,4,7‐triazacyclononane (H 3 bpatcn), in which two picolinate arms and one acetate arm are connected to the 1,4,7‐triazacyclonane core, has been prepared. Potentiometric studies show an increased stability of Gd III complex H bpatcn (log K GdL =15.8(2)) with respect analogous ligand 1,4,7‐triazacyclononane‐ N , ′, ′′‐triacetic acid nota) =13.7), associated selectivity for gadolinium over...

A new family of mixed-lanthanide (YbIII and NdIII) transition-metal (f−d) cyclen-RuII(phen)3 (phen = 1,10-phenanthroline) complexes were synthesized as dual visible- near-infrared (NIR)-emitting DNA probes/sensors. Significant changes seen in both the RuII visible YbIII-centered NIR emission, which was switched off upon binding to at pH 7.4. In contrast, no NdIII emission analogue f−d conjugate.

The cyclen-based ligand 1, possessing a [1,10]-phenanthroline moiety as pendant arm, has been used ditopic for the complexation of d- and near infrared (NIR) emitting (and) f-metal ions. This forms kinetically stable complexes, 1·Ln, with lanthanide ions such Ln = ytterbium, neodymium, lutetium (formed non-IR reference compound), synthesis photophysical properties which are described herein in detail. These 1·Ln complexes were then building blocks formation mixed d−f heteropolymetallic...

Lanthanide complexes (Ln=Eu, Tb, and Yb) that are based on a C2 -symmetric cyclen scaffold were prepared characterized. The addition of fluoride anions to aqueous solutions the resulted in formation dinuclear supramolecular compounds which anion is confined into cavity formed by two complexes. assembly process was monitored UV/Vis absorption, luminescence, NMR spectroscopy high-resolution mass spectrometry. X-ray crystal structure europium dimer revealed architecture stabilized synergistic...

The release of uranyl(VI) is a hazardous environmental issue, with limited ways to monitor accumulation in situ. Here, we present method for the detection ions through utilization unique fluorescence energy transfer process europium(III). Our system displays first example "turn-on" europium(III) emission small, water-soluble lanthanide complex triggered by ions.

This perspective article relates on the recent developments around lanthanide based upconverting molecules and supermolecules presents state-of-the-art in field as well perspectives future outlooks.

The tripodal H3thqtcn ligand allows the synthesis of well-defined neutral monomeric syn-tris(hydroxyquinolinate) complexes lanthanides. Pure [Ln(thqtcn)] (Ln = Nd, 1; Er, 2; Yb, 3) triply deprotonated thqtcn3− were prepared. Crystallographic characterization was carried out for 1 and 3, showing that is flexible enough to wrap around LnIII different size with a tricapped trigonal-prism coordination geometry. partially protonated H1.5thqtcn1.5− also binds strongly ions in methanol water (at pH...

Four new dicyanamide (dca) bridged multinuclear ZnII-Schiff-base complexes, {[Zn2L1(μ1,5-dca)dca]·CH3OH}2 (1), [Zn2L2(μ1,5-dca)dca]n (2), [Zn3L32(μ1,5-dca)2]n (3), and [(ZnL4)2Zn(μ1,5-dca)dca]n (4), have been synthesized using four different Schiff bases L1H2 = N,N/-bis(3-methoxysalicylidenimino)-1,3-diaminopentane, L2H2 N,N′-bis(5-bromo-3-methoxysalicylidenimino)-1,3-diaminopropane, L3H2 N,N′-bis(5-bromosalicylidenimino)-1,3-diaminopropane, L4H2...

Abstract Luminescent lanthanide‐doped oxides, nanoparticles, nanocrystals, and coordination complexes are major tools in the fields of optical laser materials, telecommunications, medical imaging, fluoroimmunoassays. In particular, efficient energy converters with high photostability, large ligand‐induced Stokes shifts, tunable excitation emission spectra. However, their application as light downshifting materials for solar cells has not yet been widely explored. This third generation cell...

Imaging single molecules and nanoparticles in complex biological media is highly challenging notably due to autofluorescence of cells tissues. Lanthanides lanthanide complexes, with their particularly long luminescence lifetimes, offer the possibility perform time-gated imaging thus strongly reduce background. However, very low brightness photon flux have limited use single-molecule imaging. Here, we encapsulate high amounts Europium complexes into poly(methyl methacrylate)-based particles...

Abstract A series of europium(III) and terbium(III) complexes three 1,4,7‐triazacyclononane‐based pyridine containing ligands were synthesized. The differ from each other in the substitution pendant arm, namely they have a carboxylic acid, an ethylamide, or ethyl ester substituent, i.e. , these are 6,6′,6″‐[1,4,7‐triazacyclononane‐1,4,7‐triyltris(methylene)]tris[pyridine‐2‐carboxylic acid] (H 3 tpatcn), ‐tris[pyridine‐2‐carboxamide] (tpatcnam), ‐tris[pyridine‐2‐carboxylic triethyl (tpatcnes)...

The synthesis and photophysical properties of the Eu(iii) complex , based on use 1,10-phenanthroline (phen) as a combined sensitizing antenna transition metal ion coordinating ligand, is described. long-wavelength emission from this was found to be highly pH sensitive, giving rise 'off-on-off' profile with maximum occurring within physiological range. This allowed for luminescent sensor ions, where titration ions such Cu(ii), Co(ii) Fe(ii) gave formation mixed f-d nuclear complexes,...

New highly luminescent europium(<sc>iii</sc>) complexes are designed, synthesized, comprehensively characterized and successfully tested as photon downshifters for CIGS solar cells.

In the presence of fluoride anions, [LnL(H2 O)]+ complexes, based on coordination a lanthanide (Ln) cation into cavity C2v symmetrical cyclen-based ligand (L), self-assemble in water to form [(LnL)2 F]+ dimers. The crystal structures Yb hydrated monomer and fluorinated dimer are reported analyzed unravel impact cumulative effect weak hydrogen bonding aromatic stacking interactions supramolecular assembly. assembly is stable over broad range pH 3-8. A combination equimolar amounts Eu Tb...

Abstract The success of the emerging field solid-state optical quantum information processing (QIP) critically depends on access to resonant materials. Rare-earth ion (REI)-based molecular systems, whose properties could be tuned taking advantage engineering strategies, are one systems actively pursued for implementation QIP schemes. Herein, we demonstrate efficient polarization ground-state nuclear spins—a fundamental requirement all-optical spin initialization and addressing—in a binuclear...