Two series of lanthanide metal–organic frameworks (Ln-MOFs) from two structurally related flexible carboxylate-based ligands were solvothermally synthesized. H3L2 with additional −CH2− group provides more flexibility and different coordination modes and conformations compared with H3L1. As a result, 2-Ln MOFs are modulated from two-dimensional kgd of 1-Ln to three-dimensional rtl topological frameworks and further achieve enhanced chemical stability. The Eu- and Tb-MOFs exhibit strong fluorescent emission at the solid state because of the antenna effect of the ligands. Interestingly, the emissions can be tuned by simply doping Eu3+ and Tb3+ of different concentrations within the EuxTb1–x MOFs. Notably, 2-Ln MOFs realize nearly white light emission by means of a trichromatic approach (red of Eu(III), green of Tb(III), and blue of the H3L2 ligand). Furthermore, 2-Ln MOFs also exhibit water stability and demonstrate high selective and sensitive sensing activities toward Fe(III) and Cr(VI) in aqueous solution...

Tunable Light Emission and Multiresponsive Luminescent Sensitivities in Aqueous Solutions of Two Series of Lanthanide Metal-Organic Frameworks Based on Structurally Related Ligands.

Luminescent Lanthanide Metal Organic Frameworks (LnMOFs): A Versatile Platform towards Organomolecule Sensing

Quantitative analysis of the L-tryptophan content in commercial products by chemosensor has not been reported yet. In this study, the chiral carbazole based sensor (CCS), bearing a chiral “urea-carboxylic acid” binding site was prepared. CCS was proved to be effective in the consecutive detection of Fe3+, L-tryptophan (Trp), and L-histidine (His) by naked eyes. CCS exhibits different color changes and fluorescent ‘turn-off’ response toward Fe3+ and Fe2+. The discrimination of these two oxidation states of iron by CCS is important to understand the iron-related biological reactions. The limit of detection for Fe3+ by CCS is 84 nM in a high water-content solution (99 % water). CCS sensor can act as a reversible fluorescence quenching sensor for Fe3+. The results of Job’s plot analysis and mass spectra reveal that Fe3+ binds to CCS with a 1:1 stoichiometry. The CCS-Fe3+ complex can sense tryptophan, or histidine by a dose-dependent turn-on fluorescent response in a high water-content solution (99 % water). The mass spectra suggest the sensing of L-histidine or L-tryptophan by CCS-Fe3+ was performed with a CCS-Fe3+: amino acid binding ratio of 1:1. In comparison with other chemosensors reported in the literature, CCS can detect the L-Trp and L-His with a low limit of detection (0.31 μM L-Trp, 7.64 μM L-His) in a high water content environment. Furthermore, the CCS - Fe3+ complex based chemosensor was successfully applied to quantify the L-tryptophan content in commercial sleep-improving capsules containing various ingredients. The measured L-tryptophan contents in two samples are close to the announced values.

A chiral carbazole based sensor for sequential “on-off-on” fluorescence detection of Fe3+ and tryptophan/histidine

With the serendipitous discovery of crown ethers by Pedersen more than half a century ago and the subsequent introduction of host-guest chemistry and supramolecular chemistry by Cram and Lehn, respectively, followed by the design and synthesis of wholly synthetic cyclophanes-in particular, fluorescent cyclophanes, having rich structural characteristics and functions-have been the focus of considerable research activity during the past few decades. Cyclophanes with remarkable emissive properties have been investigated continuously over the years and employed in numerous applications across the field of science and technology. In this Review, we feature the recent developments in the chemistry of fluorescent cyclophanes, along with their design and synthesis. Their host-guest chemistry and applications related to their structure and properties are highlighted.

Fluorescent cyclophanes and their applications.

Two Zn(II) coordination polymers based on 5-substituted isophthalic acid: Syntheses, crystal structures, luminescence sensing properties

A water stable europium coordination polymer as fluorescent sensor for detecting Fe 3+ , CrO 4 2- , and Cr 2 O 7 2- ions

Series of chiral interpenetrating 3d–4f heterometallic MOFs: Luminescent sensors and magnetic properties

High sensitive luminescent sensing for nitrobenzene and iron(III) by uncommon Ln-MOFs containing open ketone group sites

From 0D to 3D transition based on pH-dependent assembly of supramolecular architectures: Structures and properties

Theoretical understanding of magneto–structural correlations in dichloro-bridged dicopper(ii) complexes can guide the design of magnetic materials having broad-scale applications. However, previous reports suggest these correlations are complicated and unclear. To clarify possible correlations, magnetic coupling constants (Jcalc) of variants of a representative {Cu–(μ-Cl)2–Cu} complex A were calculated through BS-DFT. The variation of the Cu–(μ-Cl)–Cu angle (α), Cu⋯Cu distance (R0), and Cu–Cl–Cu–Cl dihedral angle (τ) followed by structural optimization and calculation of the magnetic coupling constant (Jcalc) revealed several trends. Jcalc increased linearly with R0 and τ, and initially increased and then decreased with α. Further, bridging ligand effects on Jcalc for dicopper(ii) complexes were evaluated through BS-DFT; the results revealed that Jcalc increased with increasing ligand field strength (I− < Br− < Cl− < N3− < F−). Furthermore, a linear relationship was found between the spin density of the bridging ligand and Jcalc.

/pdf/magneto-structural-maps-and-bridged-ligand-effect-for-2wosuhnw.pdf

Magneto–structural maps and bridged-ligand effect for dichloro-bridged dinuclear copper(ii) complexes: a theoretical perspective

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