Crystal structure of catena-poly[(μ2-1,3-bis(benzimidazol-1-yl)propane κ2 N:N′)-(μ2-5-methoxyisophthalato-κ2 O:O′)zinc(II)] hydrate, C26H24ZnN4O6

C26H24ZnN4O6, triclinic, P1̅ (no. 2), a = 9.724(3) Å, b = 10.173(3) Å, c = 14.642(4) Å, α = 70.380(3)°, β = 85.642(4)°, γ = 63.925(3)°, V = 1221.2(6) Å3, Z = 2, R gt(F) = 0.0411, wR ref(F 2) = 0.0981, T = 296 K.

Substituent-tuned structure and luminescence sensitizing towards Al3+ based on phenoxy bridged dinuclear EuIII complexes

We present herein a novel luminescent enhanced Eu^III complex-supported chemosensor by fine tuning the substitution group on ligands.

Chemical Sensors Based on Metal-Organic Frameworks

Metal-organic frameworks (MOFs) as chemical sensors have developed rapidly in recent years. There have been many papers concerning this field and interest is still growing. The reason is that the specific merits of MOFs can be utilized to enhance sensitivity and selectivity by various energy/charge transfers occurring among different ligands, ligand, and metal centers, such as from ligands to metal centers or metal centers to ligands, as well as from MOF skeletons to guest species. This review intends to provide an update on recent progress in various applications of different MOF-based sensors on the basis of their luminescent and electrochemical responses towards small molecules, gas molecules, ions (cations and anions), pH, humidity, temperature, and biomolecules. MOF-based sensors function by utilizing different mechanisms, including luminescent responses of "turn-on" and "turn-off", as well as electrochemical responses.

Tuning of the sensing properties of luminescent Eu3+ complexes towards the nitrate anion

The dependence of the luminescence sensing towards nitrate on the ligand donor ability, ligand stereochemistry, complex stoichiometry and concentration is shown.

Europium-doped LaF3nanocrystals with organic 9-oxidophenalenone capping ligands that display visible light excitable steady-state blue and time-delayed red emission

Visible light excitable 9-oxidophenalenone-coated LaF₃:Eu NCs display steady-state blue and time-delayed red emission; capping ligands act as probes to reveal three different Eu³⁺sites with distinct emission properties.

A new ditopic ratiometric receptor for detecting zinc and fluoride ions in living cells

The synthesis, characterization and ion binding properties of a new ditopic ratiometric receptor (1), based on 2-(4,5-dihydro-1H-imidazol-2-yl)phenol and crown ether moieties, have been described. The ditopic ratiometric receptor has been studied in sensing both F(-) and Zn(2+) ions, exhibiting different fluorescent colour changes from cyan green to blue/black observable by the naked eye under UV-light. The addition of Zn(2+) to the solution of 1 induced the formation of a 2 : 2 ligand-metal complex 1-Zn(2+), which displays a remarkable blue shift of the emission maxima of 1 from 455 nm to 400 nm due to the inhibition of excited-state intramolecular proton transfer (ESIPT) mechanism. The sensing processes were monitored by fluorescence/absorption titrations, and further confirmed by Job's plot and (1)H NMR titrations. The crystal structure of 1-Zn(2+) reveals that 1 binds Zn(2+) in four-coordinated modes. Furthermore, 1 is cell permeable and may be applied to detect trace Zn(2+) and F(-) during the development of a living organism.