Search

A new Eu-MOF was designed from an amino-functionalized ligand and Eu(iii) ions under solvothermal conditions. It is a highly porous, water-stable, and luminescent material, exhibiting pH sensing in the acidic range of pH = 7–3 with selective detection for Cd2+ by an enhanced fluorescence of ∼23-fold against a series of metal ions. Gas adsorption performance shows that Eu-MOF exhibits a high CO2/N2 (15/85) selectivity of 109.4 at 273 K and 1 atm. This performance was superior to that of most reported Ln-MOFs owing to its appropriate pore size, dipole–dipole interaction and donor–acceptor Lewis affinities. [ABSTRACT FROM AUTHOR]

The multiple metastable excited states provided by excited-state intramolecular proton transfer (ESIPT) molecules are beneficial to bring temperature-dependent and color-tunable long persistent luminescence (LPL). Meanwhile, ESIPT molecules are intrinsically suitable to be modulated as D-π-A structure to obtain both one/two-photon excitation and LPL emission simultaneously. Herein, we report the rational design of a dynamic Cd II coordination polymer (LIFM-106) from ESIPT ligand to achieve the above goals. By comparing LIFM-106 with the counterparts, we established a temperature-regulated competitive relationship between singlet excimer and triplet LPL emission. The optimization of ligand aggregation mode effectively boost the competitiveness of the latter. In result, LIFM-106 shows outstanding one/two-photon excited LPL performance with wide temperature range (100-380 K) and tunable color (green to red). The multichannel radiation process was further elucidated by transient absorption and theoretical calculations, benefiting for the application in anti-counterfeiting systems., (© 2023 Wiley-VCH GmbH.)

Organic LPL (long-persistent luminescence) materials have sparked extensive research interest due to the ultralong-lived triplet states. Although numerous organic LPL materials have been reported, most of the triplet emission was static and monotonous. Therefore, LPL materials with dynamic triplet emission are urgently required. A triamino-s-triazine derivative 1 with dynamic LPL was fabricated. The single-crystal structure shows that the abundant intermolecular interactions and small free volume restrict the molecular motion and avoid the quenchers. Spectral and theoretical calculations upheld the existence of multiple excited states in 1, and the migration of electrons between multiple excited states is very sensitive to external stimuli. By modulating the stimulus, the residence of electrons in different triplet states can be manipulated to achieve RGB LPL. Importantly, blue LPL was achieved by manipulating the anti-Kasha emission. And the red LPL can still be observed at high temperature., (© 2022 Wiley-VCH GmbH.)

Metal-organic frameworks (MOFs) with long persistent luminescence (LPL) have attracted widespread attention due to potential applications in displays, anticounterfeiting, and so on. However, MOFs often have large pore size, which restricts the formation of efficient inter- and intramolecular interactions to realize LPL. Herein, a new approach to achieving LPL in MOFs by multifold interpenetration of discrete frameworks is reported. By comparison between threefold- and twofold-interpenetrating MOFs, it was found that the former, which have higher multiplicity and denser frameworks, can be endowed with enhanced inter- and intramolecular interactions, and thus enhanced LPL is obtained. Meanwhile, metal-cluster and heavy-halogen effects could also cause variations in LPL duration and color., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

The design of white-light phosphors is attractive in solid-state lighting (SSL) and related fields. A new strategy in obtaining white light emission (WLE) from dual-way photon energy conversion in a series of dye@MOF (LIFM-WZ-6) systems is presented. Besides the traditional UV-excited one-photon absorption (OPA) pathway, white-light modulation can also be gained from the combination of NIR-excited green and red emissions of MOF backbone and encapsulated dyes via two-photon absorption (TPA) pathway. As a result, down-conversion OPA white light was obtained for RhB + @LIFM-WZ-6 (0.1 wt %), BR-2 + @LIFM-WZ-6 (2 wt %), and APFG + @LIFM-WZ-6 (0.1 wt %) samples under 365 nm excitation. RhB + @LIFM-WZ-6 (0.05 wt %), BR-2 + @LIFM-WZ-6 (1 wt %) and APFG + @LIFM-WZ-6 (0.05 wt %) exhibit up-conversion TPA white light under the excitation of 800, 790, and 730 nm, respectively. This new WLE generation strategy combines different photon energy conversion mechanisms together., (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

A new Eu-MOF was designed from an amino-functionalized ligand and Eu(iii) ions under solvothermal conditions. It is a highly porous, water-stable, and luminescent material, exhibiting pH sensing in the acidic range of pH = 7-3 with selective detection for Cd 2+ by an enhanced fluorescence of ∼23-fold against a series of metal ions. Gas adsorption performance shows that Eu-MOF exhibits a high CO 2 /N 2 (15/85) selectivity of 109.4 at 273 K and 1 atm. This performance was superior to that of most reported Ln-MOFs owing to its appropriate pore size, dipole-dipole interaction and donor-acceptor Lewis affinities.

Chronic alcoholism seriously damages the central nervous system and leads to impaired learning and memory. Cell damage in chronic alcoholism is strongly associated with elevated levels of hydrogen sulfide (H 2 S) and calcium ion overload. Aminooxyacetic acid is a cystathionine-β-synthase activity inhibitor that can reduce H 2 S formation in the brain. This study sought to observe the effect of aminooxyacetic acid on learning and memory in a chronic alcoholism rat model. Rats were randomly divided into three groups. Rats in the control group were given pure water for 28 days. Rats in the model group were given 6% alcohol for 28 days to establish an alcoholism rat model. Rats in the aminooxyacetic acid remedy group were also given 6% alcohol for 28 days and were also intraperitoneally injected daily with aminooxyacetic acid (5 mg/kg) from day 15 to day 28. Learning and memory was tested using the Morris water maze test. The ultrastructure of mitochondria in the hippocampus was observed by electron microscopy. H 2 S levels in the hippocampus were measured indirectly by spectrophotometry, and ATPase activity was measured using a commercial kit. The expression of myelin basic protein was determined by immunohistochemistry and western blotting. Compared with the control group, latency and swimming distance were prolonged in the navigation test on days 2, 3, and 4 in the model group. In the spatial probe test on day 5, the number of platform crosses was reduced in the model group. Cristae cracks, swelling or deformation of mitochondria appeared in the hippocampus, the hippocampal H 2 S level was increased, the mitochondrial ATPase activity was decreased, and the expression of myelin basic protein in the hippocampus was down-regulated in the model group compared with the control group. All the above indexes were ameliorated in the aminooxyacetic acid remedy group compared with the model group. These findings indicate that aminooxyacetic acid can improve learning and memory in a chronic alcoholism rat model, which may be associated with reduction of hippocampal H 2 S level and mitochondrial ATPase activity, and up-regulation of myelin basic protein levels in the hippocampus., Competing Interests: The authors declare that there are no conflicts of interest associated with this manuscript