Dipolar and symmetrical heptamethine dyes featuring strong linear absorption in the near-infrared spectral range (700−900 nm) were prepared at a gram scale. X-ray crystallographic structure of dipolar chromophore is described revealing remarkable planarity polyenic chain due to central ring molecule. These chromophores present promising nonlinear properties telecommunication wavelengths (1400−1600 nm): (i) significant two-photon cross-sections measured using femtosecond Z-scan method, (ii)...

A series of cationic, zwitterionic and anionic macrocyclic europium complexes has been prepared incorporating a N or C- linked acridone chromophore that allows sensitisation Eu emission following excitation at 390–410nm. Each these selectively binds bicarbonate physiological pH reversible binding is signalled by change in the form relative intensity spectrum. Affinity for regulated overall complex charge falls within range required intracellular extracellular analyses. Monitoring ratio up to...

A series of near-infrared solid-state emitters based on the dicyanoisophorone electron acceptor group was synthesized. The spectroscopic properties were studied by UV−visible absorption spectroscopy and fluorescence analyzed in light single crystal structures obtained X-ray diffraction. This push−pull dipolar fluorophores differing only substituent groups donor end display interesting emission with an ranging from 710 to 790 nm. origin depends nature that influence packing trigger formation...

A water soluble Lemke chromophore derivative shows an unusual polarity dependence of its emission efficiency, leading to strong red-NIR fluorescence in when fitted with appropriate water-solubilizing polymer chains. In this edge article, the synthesis is described. The on solvent investigated experimentally and rationalized basis ab initio calculations. Finally, we demonstrate that a valuable candidate for vivo two-photon imaging cerebral vasculature, absorption biological transparency window.

A rational approach to the formation of pure heteropolymetallic lanthanide complexes that uses a two-step assembly strategy and exploits different size requirements two metals included in final structure is described. The investigation [LnL2](Otf) (L = 2,2':6',2' '-terpyridine-6-carboxylate) into hexametallic rings hosting an additional hexacoordinated cation was crucial for development this strategy. cyclic are controlled by ionic radius coordination number lanthanides. rather high...

A simple bridge solves a difficult architectural problem. Ligand H4tpaen, with an ethylenediamine backbone that has ten donor atoms, yields ten-coordinate lanthanide complexes, thus providing highly effective protection of the metal center from interaction solvent molecules. As result, EuIII and TbIII complexes (tpaen)4− show bright long-lived luminescence in H2O combined high solubility stability.

The simple asymmetric tetradentate ligand 2,2':6',2' '-terpyridine-6-carboxylic acid leads to the self-assembly of first europium nanowheel containing ions in two different coordination environments. Moreover bis(terpyridinecarboxylate) species form a hexameric wheel capable strongly binding LnIII cations is controlled by ligand/cation ratio.

A new class of push-pull molecules was recently identified, based on pyridine dicarboxamide as an electron acceptor group and bearing a fluorenethynyl pi-conjugated bridge. The present good second third order nonlinear properties, with static quadratic hyperpolarisability mubeta (at 1.907 microm) 320 x 10(-48) esu (mubeta(0) = 249 esu) maximum two-photon absorption cross-section 1146 GM. Starting from this generic structure, we designed series eight amphiphilic probes, varying the length...

The concept of octupolar molecules has considerably enlarged the engineering second-order nonlinear optical materials by giving access to 2D and 3D architectures. However, if archetype symmetry is a cube with alternating donor acceptor groups at corners, no translation this ideal structure into real molecule been realized date. This may be achieved designing bis(phthalocyaninato)lutetium(III) double-decker complex crosswise ABAB phthalocyanine bearing electron-donor electron-acceptor groups....

In the present work, we report multibranching effect on dynamic first-order hyperpolarizability (β(−2ω; ω, ω)) of triphenylamine derivatives containing cyanopyridine one-branch (dipolar structure), two-branch (V-shaped and three-branch (octupolar structure) structures. For this study, used hyper-Rayleigh scattering (HRS) technique involving picosecond pulse trains at 1064 nm. Our results show that βHRS increases from 2.02 × 10–28 to 9.24 cm5/esu when an extra branch is added molecule,...

Fluorophores displaying a sensitive response to pH are reported. Structural variations allow fine tuning of p<italic>K</italic>_a and ratiometric intracellular imaging.

Polyamines have been reported to protect DNA against the formation of radiation-induced strand breaks and crosslinks proteins. The present study was aimed at investigating protective effect spermine, spermidine putrescine degradation bases upon exposure gamma rays in aerated aqueous solution. yield 8-oxo-7,8-dihydroguanine 5-hydroxycytosine found decrease for concentrations spermine greater than 0.1 mM. A protection factor 10 observed a concentration 1 mM latter two polyamines. Putrescine...

A series of six, cationic, zwitterionic and anionic Eu complexes has been examined for the analysis hydrogencarbonate concentration in intracellular extracellular ranges; an complex incorporating three glutarate residues a sensitising acridone chromophore (λexc = 410 nm) exhibits 69% change intensity ratio 618/588 nm emission bands between 5 15 mM HCO3– cell lysate medium.

Selectivity in the binding of phosphorylated tyrosine residues to aqua-lanthanide complexes is signalled by changes spectral form luminescence emission and 1H NMR spectroscopy.

The crystal and molecular structure the stability of lead calcium complexes two chelates containing picolinate chelating groups in different geometries have been investigated order to relate ligand affinity selectivity for over with ability accommodate a stereochemically active lone pair. structures diprotonated monoprotonated tripodal tpaa2- show that three arms coordinate an asymmetric way leaving gap coordination sphere As consequence this binding mode, one arm is very weakly bound...

Dyes emitting in the solid state red or near-infrared range are much sought after for application bioimaging especially if long emission wavelength can be combined with two-photon excitation to provide unique contrast and penetration depth.

Fifteen heptamethine dyes in which a tricyanofuran acceptor is linked to donors of different strengths were synthesized, and their absorption, thermal, electrochemical, second-order nonlinear optical properties investigated. While the variation peripheral bulky substituents allowed decrease intermolecular interactions solid state, subtle engineering heterocyclic donor provided with electronic structures that varied between dipolar cyanine-like (i.e., little bond length alternation ground...

Fluorescent nanoparticles built from aggregation-induced emission-active organic molecules (AIE-FONs) have emerged as powerful tools in life science research for vivo bioimaging of organs, biosensing, and therapy. However, the practical use such biotracers has been hindered owing to difficulty designing bright with controlled dimensions (typically below 200 nm), narrow size dispersity long shelf stability. In this article, we present a very simple yet effective approach produce monodisperse...

Abstract Long‐lived room temperature phosphorescence from organic molecular crystals attracts great attention. Persistent luminescence depends on the electronic properties of components, mainly π‐conjugated donor–acceptor (D‐A) chromophores, and their packing. Here, a strategy is developed by designing two isomeric phosphors incorporating combining bridge for σ‐conjugation between D A units structure‐directing unit H‐bond‐directed supramolecular self‐assembly. Calculations highlight critical...

This work investigates the electron-donating capabilities of two 10-π electron nitrogen bridgehead bicyclic [5,6]-fused ring systems, imidazo[1,2-a]pyridine and imidazo[1,5-a]pyridine rings. Eight compounds with varying positions electron-withdrawing moieties (TCF or DCI) coupled to imidazopyridine were synthesized studied. DCI-containing (Ib–IVb) exhibited a purely dipolar nature broad absorption bands, weak fluorescence, large Stokes shifts, strong solvatochromism. In contrast,...

A series of asymmetrically substituted free-base di- and tetra-phenylporphyrins the associated Zn-phenylporphyrins were synthesized studied by X-ray diffraction, NMR, infrared, electronic absorption spectra, as well fluorescence emission spectroscopy, along with theoretical simulations vibration structures. The synthesis selectively afforded trans-A₂B₂ porphyrins, without scrambling observed, where AA BB taken donor- acceptor-substituted phenyl groups. combined results point to similar...

We report herein the synthesis, functionalization, and successful radical polymerization of very nonlinear optical (NLO) active push–pull polyene chromophores (CPO). Second, thermal Huisgen cyclo-addition cross-linking reaction was implemented, it proved to be fully compatible with a polyene-based chromophore. Toward this goal, PMMA-co-CPO-3 two cross-linkable polymers (PCC1-CPO-3 PCC2-CPO-3) were first prepared characterized by modified Teng Man technique performed in transmission. These...