Solar-driven artificial photosynthesis via CO2 reduction represents a promising method for generating renewable feedstock in a sustainable manner. However, CO2 activation is very demanding and the separation of undesired O2 as by-product is challenging. Promoting the oxidation of organic substances by consuming photo-generated holes can effectively prevent O2 production, improving energy conversion, product selectivity and separation. In this study, we report a photosensitizer-functionalized (tris(2,2 '-bipyridyl)ruthenium, PS) dual-atom-site [Ru (C10N2H4)2Cl2]H4[Ru2Cl2(CH3COO)4]& sdot;H2O (PS-Ru2) photocatalyst that promotes the conversion of CO2 to CO with the photooxidation of benzylamine to liquid benzylidenebenzylamine, enabling facile separation without additional photosensitizers or sacrificial agents in a single redox cycle. This is the first reported dual-atom-site photocatalytic system to promote an artificial photosynthetic CO2 reduction coupled with benzylamine oxidation, delivering high activity, selectivity and separability. Modification of the photosensitizer resulted in an eleven-fold increase in yield, representing a significant advancement in catalytic CO2 photoreduction. The findings of this study establish a novel dual-atom-site catalyst design strategy that facilitates dual-functional artificial photosynthesis, enabling by-product reuse with improved performance.

The compounds Co2(OH)(5-cnapp)(H2O) (1) and Co8(OH)(4-cnapp)5(H2O)10·12H2O (2) obtained using positionally isomeric phosphonic acids (5-/4-cnappH3) have 3D framework structures. Compound 1 contains a distorted Co3(μ3-OH)-based kagomé layer and shows long-range weak ferromagnetic ordering below 30 K without significant spin frustration.

Developing photocatalysts with low energy consumption and high efficiency for CO2 fixation without any cocatalyst is a highly sought-after goal, but it still presents a significant challenge. Herein, aiming at enhancing the efficiency of photodriven CO2 cycloaddition reactions, an imidazolium bromide ionic liquid-functionalized polyoxometalate photocatalyst ImBr-[Ru(C10N2H8)(2)]H[AsW12O40]2H(2)O with Ru-based photosensitizer coordinated with ionic liquids via strong coupling between the metal active site and carboxy group is reported. The optimized ImBr-[Ru(C10N2H8)(2)]H[AsW12O40]2H(2)O achieves efficient photocatalytic CO2 cycloaddition with epoxides at ambient temperature without additional cocatalyst and photosensitizer, which is much higher than most reported photocatalysts in the presence of TBAB cocatalyst. The experimental results indicated that imidazolium bromide ionic liquid facilitating the ring-opened reaction of epoxides, the radical mechanism, and a plausible reaction pathway for the epoxidation step was further proposed by in situ DRIFT and EPR. Remarkably, this is the first report on the photoeffect of polyoxometalate-based catalysts with ionic liquid-functionalized molecules for catalytic CO2 photofixation without any cocatalyst and sacrificial agent.

Upon dissolution of ammonia in water, an instant imbalance of atmospheric pressure inside and outside the bottle is produced.This imbalance allows the fountain experiment to be carried out based on the preparation, collection of ammonia gas, and the tail gas treatment device.Through a simple experiment, a double-fluorescent fountain can be formed based on the Luminol reaction and the indicator phenolphthalein.The purpose of this experiment is to demonstrate the properties of ammonia and show Luminol's bright blue light reaction when it encounters blood.This reaction is mainly used in the detection of blood in modern criminal investigations which can often be seen in detective mystery films, further increasing interest in chemistry.

Three tartrate-bridging lanthanide-based tungstoarsenate dimers K11H13[Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·nH2O (Ln3+ = Eu3+ (1Eu), n = 50; Tb3+ (2Tb), n = 34; C4O6H6 = tartaric acid) and K15H9[Dy3(H2O)15(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·21H2O (3Dy) have been synthesized and further characterized by elemental analyses, X-ray powder diffraction, IR spectra, thermogravimetric analyses and single-crystal X-ray diffraction. Structural analyses indicate that all the polyanions of 1Eu-3Dy are isostructural, and are composed of two identical asymmetric sandwiched subunits [Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]12- interlinked by two tartrate ligands. Furthermore, the photoluminescence and variable-temperature magnetic properties of 1Eu, 2Tb and 3Dy have also been investigated.

Self-assembly reactions of K8Ta6O19·17H2O, CoCl2·6H2O and organic ligands yield, depending on the different organic ligands, two new polyoxotantalate complexes: [(Ta6O19)Co(H2O)3]6− (1a) and [(Ta6O19)Co(en)]210− (2a). The polyoxoanion 1a is a monomeric comprised of one {Ta6O19} unit and one Co ion, while the polyoxoanion 2a is a dimeric structure based on 1a. Both the compounds were characterized in the solid state by single crystal X-ray diffraction, elemental analysis, X-ray photoelectron spectroscopy, thermal gravimetric, UV–vis spectra and FT-IR. In addition to the structural characterization, the solution behavior of these clusters has also been explored using electrospray ionization mass spectrometry. Interestingly, the peak assignments display that compound 1 exists as monomer or further reorganizes to dimer in water and compound 2 can retain its structural integrity.

Greenish yellow and yellow to orange phosphorescent iridium(iii) complexes have been synthesized and fully characterized with respect to their electrochemical, photophysical and device optoelectronic properties.

Metal-organic coordination polymers (MOCPs) have been emerging as very attractive nanomaterials due to their tunable nature and diverse applications. Herein, using Tb3+ as the luminescence center, 1,3,5-benzenetricarboxylate (BTC) as building block and Cu2+ as the signal modulator as well as a recognition unit, we propose a novel and effective lanthanide functionalized MOCP (LMOCP) fluorescent sensor (Cu-BTC/Tb) for amyloid β-peptide (Aβ) monomer, a biomarker for Alzheimer disease (AD). Specifically, Cu-BTC/Tb, created by postsynthesis modification strategy under room temperature, is almost nonemissive due to the quenching effect of Cu2+ in the MOCP, exhilaratingly, the presence of Aβ1-40 triggered a significant emission enhancement of Cu-BTC/Tb assay due to the high binding affinity of Aβ1-40 for Cu2+ and the subsequent suppression of the quenching effect. In the assay, this LMOCP sensor shows high sensitivity with detection limit of 0.3 nM. Due to its capability to eliminate autofluorescence, Cu-BTC/Tb was also applied to the time-gated detection of Aβ1-40 in human plasma with promising results. This work presents a novel strategy for the construction of functional luminescent LMOCP for sensitively turn-on fluorescent sensing of Aβ1-40. We believe the proposed strategy would inspire the development of various LMOCP-based fluorescent assays or medical imaging platforms for advanced biological implementations.

Two new metal-organic frameworks [Mn-3(MMA)(2)(INA)(2)](n) (1) and [Cu-2(FA)(INA)(3)(H2O)](n), (2, FA = formate) were prepared solvothermally by using mixed methylmalonic acid (H(2)MMA) and isonicotinic acid (HINA) as the initial reactants. Single-crystal X-ray diffraction analyses reveal that complex 1 has a 3D framework structure consisting of 2D [Mn-3] layer units and INA connector, and 2 owns a 2D pillar-layered structure constituted of mononuclear-Cu(II)-based 2D layer unit and paddle-wheel dinuclear Cu(II) cluster-based pillared linker, which further interspersed with each other to form a 3-fold interpenetrated framework with a (4(8).6(2))-SP topology. The magnetic studies show that 1 displays antiferromagnetic ordering at low temperature, and a strong antiferromagnetic interaction exists in 2.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Three organic-inorganic hybrid materials, namely [RE(H2O)(3)K(H2O)(2) (pddc)(2)](2)H-4[SiW12O40]center dot 2H(2)O (RE = Pr (1), Nd (2); H(2)pddc = 3,4-pyridine dicarboxylic acid) and [Y(pzdc)(H2O)(3)](2)H-2[SiW12O40]center dot 4H(2)O (3) (H(2)pzdc = 2,3-pyrazine dicarboxylic acid) have been synthesized and characterized by elemental analyses, IR spectra, UV spectra, TG analyses and X-ray crystallography. Single crystal X-ray analyses reveal that 1-3 all exhibit 2D layer structures. Interestingly, 1 and 2 are isostructural differenting from 3. In 3, the polyoxoanions [SiW12O40](4-) connect the rare earth cations [Y(pzdc)(H2O)(3)](2+) via Y-O bonds forming a (4, 4)-connected 2D topology net with Schlafli symbol of 3(2).6(2).7(2).

A 2D magnetic network consisting of water-bridged 1D Co2+ chains and cis-CHDA bridges displays spin-canted antiferromagnetism with spin-glass behavior.

One three-dimensional Gd(III) coordination polymer with 1,2-phenylenediacetate (PDA2−), [Gd2(PDA)3(H2O)2]·3H2O (1), has been successfully synthesized and characterized. Single crystal X-ray diffraction analysis shows that 1 consists of 1D wave Gd-based chain unit and PDA2− linker. Magnetic studies suggest the presence of ferromagnetic Gd⋯Gd coupling in the 1D chain unit of 1. Meanwhile, 1 has a significant cryogenic magnetocaloric effect with the maximum −ΔSm of 33.44 at 2K and 7T.

Two types of lanthanide coordination polymers based on homophthalic acid (H(2)HPA), one-dimensional {[Ln(HPA)(NO3)(H2O)(2)]center dot H2O}(n) (Ln = Eu (1); Gd (2); Tb (3); Dy (4)) and two-dimensional {[Ln(2)(HPA)(3)(H2O)(2)]center dot H2O}(n) (Ln = Eu (5); Gd (6); Tb (7); Dy (8)), were solvothermally synthesized. Compounds 1-4 show a one-dimensional (1D) linear chain structure consisting of a HPA(2-) linker and [Ln(2)] cluster unit. Compounds 4-8 are crystallographically isostructural and contain 1D lanthanide-carboxylate building units [Ln(4)(CO2)(10)](n) built from the adjacent Ln(3+) ions and carboxyl groups of the H(2)HPA ligands, which can further give two-dimensional layer structures via the link of HPA(2-). The magnetic studies reveal that complexes 2 and 6 with isotropic Gd3+ ion exhibit significant cryogenic magnetocaloric effects with a maximum -Delta S-m value of 35.58 and 35.41 J kg(-1) K-1 at 2 K and 7 T, respectively. In addition, the solid-state photophysical properties of 1/5 and 3/7 respectively display strong characteristic Eu3+ and Tb3+ photoluminescent emission in the visible region, suggesting that Eu- and Tb-based luminescences are sensitized by the effective energy transfer from the ligand to the metal centers.

Three thermally activated delayed fluorescence cationic cuprous complexes [Cu(POP) (ECAF)]PF6 (1, POP = bis(2-diphenylphosphinophenyl)ether, ECAF = 9,9-bis(9-ethylcarbazol-3-yl)-4,5-diazafluorene), [Cu(POP) (EHCAF)]PF6 (2, EHCAF = 9,9-bis(9-ethylhexylcarbazol-3-yl)-4,5-diazafluorene), and [Cu(POP) (PCAF)]PF6 (3, PCAF = 9,9-bis(9-phenylcarbazaol-3-yl)-4,5-diazafluorene) with bipolar 4,5-diazafluorene ligand substituted by bis-carbazole have been successfully prepared, and their UV absorption, photoluminescent properties, and electrochemical behaviors were investigated. At room temperature, complexes 1, 2, and 3 exhibit efficient yellowish-green emission with peak maxima of 550, 549, and 556 nm, respectively, and lifetimes of 5.7 μs. In powder states, the quantum yields (ϕPL) of 22.4% for 1, 18.5% for 2, and 20.0% for 3, respectively, are found. These metal phosphors can be vacuum-evaporated and applied in the organic light-emitting diodes (OLEDs) of indium tin oxide/poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (40 nm)/4,4',4″-tri(9-carbazoyl)triphenylamine (15 nm)/cuprous complexes (10 wt %): 1,3-bis(9-carbazolyl)benzene (30 nm)/1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene (50 nm)/LiF (0.5 nm)/Al (100 nm). Complex 1-based device D1 achieved a maximum luminance of 11 010 cd m-2, a current efficiency of 47.03 cd A-1, and an external quantum efficiency of 14.81%. The high electroluminescence efficiencies of these complexes are assumed to be due to their good thermal stabilities and capture of both singlet and triplet excitons. The research presented here provides a powerful tool toward highly efficient and cheap OLED devices.

One new three-dimensional Cd(II) polymer [Cd3(MMA)2(INA)2]n (1) was synthesized hydrothermally based on mixed flexible methylmalonic acid (H2MMA) and rigid isonicotinic acid (HINA) ligands. Single-crystal X-ray diffraction analysis reveals that compound 1 has a 3D framework structure consisting of 2D {Cd3} layer unit and INA− connector, which bears a (3,8)-connected tfz-d topology with Schläfli symbol of {43}2{46.618.84}. The solid-state luminescent property was studied and 1 exhibits strong emission centered at 429nm.

Four 1D Ln–phenylacetate polymers were synthesized hydrothermally, and displaying interesting ferromagnetic behavior, photoluminescence, significant MCE or rare spin-glass behavior.

Four two-dimensional heterometallic Cu–Ln coordination polymers based on the 2-methylenesuccinic acid (H2MSA) ligand, {[Ln2Cu(MSA)4(H2O)6]·2H2O}n(Ln = La (1); Gd (2); Tb (3); Dy (4)), have been obtained under hydrothermal conditions. Complexes 1–4 bear a feature of one-dimensional [Ln2Cu] chains linked by 2-methylenesuccinate (MSA2−) bridges to form a 2D layer structure. Magnetic studies suggest the presence of weak antiferromagnetic Gd⋯Gd coupling and weak ferromagnetic Cu⋯Gd coupling in the 1D [Gd2Cu] chain unit of 2. The magnetic entropy change (−ΔSm) reached 36.05(1) J K−1 kg−1 for 2, making it an attractive refrigerant for low-temperature applications.

Yellow, orange to red iridium(iii) complexes bearing oxadiazol-substituted amide ancillary ligand have been synthesized and their electroluminescent properties were investigated.

Three novel iridium(III) complexes bearing oxadiazol-substituted amide ligands have been synthesized and characterized, and the photophysical and electrochemical properties have been investigated. All the complexes exhibit blue light emission with major peaks at 472, 468 and 462 nm in acetonitrile solutions, respectively. Both photophysical properties and quantum chemical calculations demonstrate that photoluminescence of these complexes are mainly from cyclometalated ligand-based (3)pi-pi* excited states. Using these complexes as emitters, the organic light-emitting diodes with single-or double-emitting layers were fabricated. The devices with double-emitting layers exhibit good electroluminescence performances with the maximum current efficiencies of 10.5, 63 and 4.6 cd A(-1), respectively, and mild efficiency roll-off. (C) 2017 Elsevier Ltd. All rights reserved.