Enantioselective formal total synthesis of dihydrospirotryprostatin B.

Spirotryprostatins are representative members of medicinally interesting bioactive molecules of the spirooxindole natural products. In this communication, we present a novel enantioselective total synthesis of the spirooxindole alkaloid dihydrospirotryprostatin B. The synthesis takes advantage of copper-catalyzed tandem reaction of -iodoanilide chiral sulfinamide derivatives with alkynone to rapidly construct the key quaternary carbon stereocenter of the natural product dihydrospirotryprostatin B.

Polyoxometalate-dependent Photocatalytic Activity of Radical-doped Perylenediimide-based Hybrid Materials.

Inorganic-organic hybrid materials are a kind of multiduty materials with high crystallinity and definite structures, built from functional inorganic and organic components with highly tunable photochemical properties. Perylenediimides (PDIs) are a kind of strong visible light-absorbing organic dyes with π-electron-deficient planes and photochemical properties depending on their micro-environment, which provides a platform for designing tunable and efficient hybrid photocatalytic materials. Herein, four radical-doped PDI-based crystalline hybrid materials, Cl-PDI⋅SiWO (1), Cl-PDI⋅SiMoO (2), Cl-PDI⋅PWO (3), and Cl-PDI⋅PMoO (4), were attained by slow diffusion of polyoxometalates (POMs) into acidified Cl-PDI solutions.

Ru(II)-Ru(II) and Ru(II)-Os(II) Homo-/Heterodinuclear Complexes and Ru(II)-Ru(II) Homotetranuclear Complexes Based on Heteroditopic Bridging Ligands: Synthesis, Photophysics, and Effective Energy Transfer.

In this paper, the synthesis, photophysics, electrochemistry, and intramolecular energy transfer of two series of dinuclear and tetranuclear metallic complexes [(bpy)MM(bpy)] ( = 1, 2; M = Ru, M = Ru/Os; M = Os, M = Ru) and {[Ru(bpy)()]Ru} based on new heteroditopic bridging ligands ( = 6-phenyl-4-Hpip-2-2'-bipyridine, = 6-Hpip-2-2'-bipyridine, Hpip = 2-phenyl-1-imidazo[4,5-][1,10]phenanthroline) are reported. The dimetallic and tetrametallic complexes exhibit rich redox properties with successive reversible metal-centered oxidation and ligand-centered reduction couples. All complexes display intense absorption in the entire ultraviolet-visible spectral regions.

Energy transfer in metal-exchange binuclear complexes covalently linked by asymmetric ligands.

Nitrogen complexation with π-conjugated ligands is an effective strategy for synthesizing luminescent molecules. The asymmetric bridging ligands L (L1 and L2) have been designed. The terminal chelating sites of the L1 and L2 bridging ligands consisted of 2,2'-bipyridine (bpy) and 1,10-phenanthroline moieties (where L = L1 and L2; L1 = 2-(3-((4-([2,2'-bipyridin]-6-yl)benzyl)oxy)phenyl)-1-imidazo[4,5-][1,10]phenanthroline and L2 = 2-(3-((4-(6-phenyl-[2,2'-bipyridin]-4-yl)benzyl)oxy)phenyl)-1-imidazo[4,5-][1,10]phenanthroline).

Highly efficient photocatalytic hydrogen production by ZnCdS composite catalyst modified with NiCoP nanosheets prepared by LDH precursor.

The unique characteristics and diverse applications of 2D transition metal phosphides have aroused significant interest. In this paper, we successfully prepared 2D NiCoP modified ZnCdS composite. The NiCoP nanosheets were successfully obtained by phosphating layered double hydroxide (LDH) precursor.

Monomer-Promoting Asymmetric Kinetic Resolution-Alternating Copolymerization To Afford AAB-Type Copolyesters.

Living copolymerization of mixed monomers can enrich the diversity of copolymer materials with well-defined performance via controlling both monomers and stereosequences. However, periodic sequence-controlled living copolymerization of same-type monomers with more than two components in synthetic polymer science remains a challenge. In this work, a new method of monomer-promoting asymmetric kinetic resolution-alternating copolymerization can let a tricomponent mixture of l-lactide (-LA or l-LA) and two enantiomeric isomers of racemic tropic acid cyclic esters (tropicolactone) be polymerized into sequence-controlled -(AAB)- type biodegradable copolyesters (the subscript S presents the configuration and A and B present lactic acid units and tropic acid units, respectively), and diblock copolymers of -(AAB)--(AAB)- can further be obtained upon addition of -LA (dLA).

Effect of electronic structure of energy transfer in bimetallic Ru(II)/Os(II) complexes.

Novel monometallic (μ-LL')Ru, Ru(μ-LL'), homobimetallic Ru(μ-LL')Ru, and heterodimetallic Ru(μ-LL')Os and Os(μ-LL')Ru complexes based on two asymmetrical ligands LL' (where LL' = LL, LL) have been synthesized and characterized. Spectroscopic analysis indicates that all complexes exhibit intense spin-allowed ligand-centered (LC) transitions at 288 nm and Ru-based moderate spin-allowed MLCT absorption between 440-450 nm. The Ru(μ-LL')Os and Os(μ-LL')Ru dinuclear complexes show Os-based unit absorption in the range of 565-583 nm.

Molecular Iodine Capture by Covalent Organic Frameworks.

The effective capture and storage of volatile molecular iodine from nuclear waste is of great significance. Covalent organic frameworks (COFs) are a class of extended crystalline porous polymers that possess unique architectures with high surface areas, long-range order, and permanent porosity. Substantial efforts have been devoted to the design and synthesis of COF materials for the capture of radioactive iodine.

Perylenediimide-Based Hybrid Materials for the Iodoperfluoroalkylation of Alkenes and Oxidative Coupling of Amines: Bay-Substituent-Mediated Photocatalytic Activity.

Inorganic-organic donor-acceptor hybrid compounds are an emerging class of multifunctional crystalline materials with well-defined structures built from semiconductive inorganic and organic components. Perylenediimides (PDIs) are a prominent class of electron-deficient organic dyes, which can undergo consecutive photoinduced electron transfers to generate doublet excited-state radical anions for photoredox-inert chemical bonds. Thus, this is an excellent organic component for building hybrid materials to study the structure-property relationships in organic synthesis.

Discarded COVID-19 masks-derived-doped porous carbon for lithium-sulfur batteries.

Despite the high theoretical capacity and energy density of lithium-sulfur (Li-S) batteries, the development of Li-S batteries has been slow due to the poor electrical conductivity and the shuttle effect of the electrode materials, resulting in low sulfur utilization and fast long-term cycling capacity decay. The modified carbon materials are often used as sulfur hosts to significantly improve the cycling performance of the materials, but also bring high-cost issues. Here, the porous carbon materials are synthesized quickly and conveniently by the microwave cross-linking method using discarded medical masks as carbon sources and concentrated sulfuric acid as solvent.

Synthesis and antitumor activity of novel hybrid compounds between 1,4-benzodioxane and imidazolium salts.

A series of novel hybrid compounds between 1,4-benzodioxane and imidazolium salts was designed and prepared. The compounds were evaluated in vitro against a panel of human tumor cell lines (K562, SMMC-7721, and A-549). The structure-activity relationship results demonstrated that the 2-methyl-benzimidazole or 5,6-dimethyl-benzimidazole ring and substitution of the imidazolyl-3-position with a 4-phenylphenacyl substituent were critical for promoting cytotoxic activity.

Merging of the photocatalyst decatungstate and naphthalene diimide in a hybrid structure for the oxidative coupling of amines.

Designing and developing novel hybrid materials for the effective photoconversion of organic substrates is of great importance. Crystalline hybrid heterostructures, as an attractive class of material, are composed of semiconducting organic and inorganic components with fast-responsive charge-separated properties and thus they are promising photocatalysts. Naphthalene diimides (NDIs) and decatungstate (WO) are two versatile semiconductor components that have been utilized as building blocks for the construction of functional materials for various applications.

Correction: A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability.

Correction for 'A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability' by Shu-Biao Xia , , 2018, , 13222-13228, DOI: 10.1039/C8DT02930J.

Correction: Naphthalimide-containing coordination polymer with mechanoresponsive luminescence and excellent metal ion sensing properties.

Correction for 'Naphthalimide-containing coordination polymer with mechanoresponsive luminescence and excellent metal ion sensing properties' by Jian-Jun Liu , , 2020, , 3174-3180, DOI: 10.1039/C9DT04928B.

Photochromism and photoswitchable luminescence in a Zn cluster-based metal-organic framework with an organic guest.

Photochromic materials coupled with photoswitchable luminescence functionalities are of particular interest due to their potential applications in switches and optical memory devices. However, the construction of such materials, especially those with two-color emission states, is still challenging. In this context, a rare Zn cluster-based host-guest MOF material, (bbmp)[Zn(IPA)(OH)(HO)] (1) (HIPA = isophthalic acid, bbmp·2I = 4,4'-([1,1'-biphenyl]-4,4'-diyl)bis(1-methylpyridin-1-ium) diiodide), was prepared by encapsulating an organic cation into an anionic MOF produced from zinc cations and isophthalic acid ligands, which exhibits reversible naked detectable photochromic properties varying from yellow to green upon UV-Vis light irradiation.

Naphthalimide-containing coordination polymer with mechanoresponsive luminescence and excellent metal ion sensing properties.

Mechanoresponsive luminescent materials coupled with other functionalities are of particular interest due to their multiple external stimuli responsive properties. In this paper, a new sensitive mechanoresponsive luminescent coordination polymer, [Cd(INI)(DMF)2·DMF] (1) (H2INI = N-(5-isophthalic acid)-1,8-naphthalimide), has been successfully designed and synthesized. Complex 1 exhibits interesting mechanoresponsive and grinding-enhanced luminescence properties, and its luminescence colour changed from weak blue-green to bright blue upon grinding owing to the external pressure-induced destruction of ππ stacked arrangements in local defective areas.

Copper-Catalyzed Coupling of Sulfonamides with Alkylamines: Synthesis of ()--Sulfonylformamidines.

Herein, we describe an efficient copper-catalyzed coupling of sulfonamides with alkylamines to synthesize ()--sulfonylformamidines. The reaction is accomplished under mild conditions without the use of a corrosive acid or base as an additive. It tolerates a broad scope of substrates and generates the products with exclusive ()-stereoselectivity.

A Novel Ruthenium(II) Polypyridyl Complex Bearing 1,8-Naphthyridine as a High Selectivity and Sensitivity Fluorescent Chemosensor for Cu and Fe Ions.

A novel ruthenium(II) polypyridyl complex bearing 1,8-naphthyridine was successfully designed and synthesized. This complex was fully characterized by EI-HRMS, NMR, and elemental analyses. The recognition properties of the complex for various metal ions were investigated.

A photochromic zinc-based coordination polymer for a Li-ion battery anode with high capacity and stable cycling stability.

Rechargeable Li-ion batteries (LIBs) are currently the dominant power source for electric vehicles and portable electronic devices, and for small-scale stationary energy storage. However, one bottleneck of the anode materials for LIBs is the poor cycling performance caused by the fact that the anodes cannot maintain their integrity over several charge-discharge cycles. In this article, a zinc-based two-dimensional coordination polymer [Zn(bcbpy)(PTA)(HO)] (Zn-BCP) has been synthesized (Hbcbpy·2Cl = 1,1'-bis(3-carboxylatobenzyl)-(4,4'-bipyridinium) dichloride, PTA = terephthalic acid), which was characterized by single-crystal X-ray diffraction, powder X-ray diffraction, infrared spectroscopy and thermogravimetric analysis.

An inorganic-organic hybrid supramolecular framework as a high-performance anode for lithium-ion batteries.

Herein, an excellent anode was achieved for a lithium-ion battery based on a polyoxometalate-organic framework [Ni5(OH)3(trzS)3(en)(H2O)(B-α-PW9O34)] for the first time. It can deliver a capacity of 710 mA h g-1 at 100 mA g-1 after 50 cycles and a high capacity retention of 82.2% after 500 cycles at a high rate of 800 mA g-1, which is supposed to be due to the unique porous characteristic and high chemical stability of the proposed anode.

Anion-Controlled Architecture and Photochromism of Naphthalene Diimide-Based Coordination Polymers.

Three new cadmium coordination polymers, namely [Cd(NO₃)₂(DPNDI)(CH₃OH)]·CH₃OH (), [Cd(SCN)₂(DPNDI)] (), and [Cd(DPNDI)₂(DMF)₂]·2ClO₄ () (DPNDI = ,-di(4-pyridyl)-1,4,5,8-naphthalene diimide, DMF = ,-dimethylformamide) have been synthesized by reactions of DPNDI with Cd(NO₃)₂, Cd(SCN)₂, and Cd(ClO₄)₂, respectively. Compound is a one-dimensional coordination polymer with strong lone pair-π interactions between the coordinated NO₃ anions and the imide ring of DPNDI; while is a two-dimensional network with a (4, 4) net topology. In the case of , due to the presence of uncoordinated perchlorate counter ions, it exhibits a non-interpenetrated square-grid coordination polymer containing one-dimensional rhomboid channels.

Catalyst-Free 1,6-Conjugate Addition/Aromatization/Sulfonylation of -Quinone Methides: Facile Access to Diarylmethyl Sulfones.

An efficient, catalyst-free strategy to construct diarylmethyl sulfones via 1,6-conjugate addition/aromatization/sulfonylation reaction of -quinone methides with sulfonyl hydrazides under mild and environmentally benign conditions has been developed. The established protocol provided a highly chemo- and regioselectivity synthesis of a diverse array of novel diarylmethyl sulfones with excellent yields, and the reaction could be scaled up.

[Analysis of the interaction between cefdinir and bovine serum albumin by spectrometry].

Objective: To explore the interaction between cefdinir (CE) and bovine serum albumin (BSA) by fluorescence and ultraviolet-visible absorption spectrometry.


Methods: Under the optimal conditions, the interaction between CE and BSA was investigated by fluorescence and ultraviolet-visible absorption spectrometry.


Results: CE could quench (static quenching) the intrinsic fluorescence of BSA by forming the CE-BSA complex.

Two star-shaped tetranuclear Ru(II) complexes containing uncoordinated imidazole groups: synthesis, characterization, photophysical and pH sensing properties.

Tetrapodal ligands H4L(1) and H4L(2) containing imidazole groups have been synthesized by the reaction of 1,10-phenanthroline-5,6-dione with 1,2,4,5-tetrakis[(4-formylphenoxy)methyl]benzene and 1,2,4,5-tetrakis[(3-formylphenoxy)methyl]benzene, respectively, in presence of NH4OAc. Two star-shaped complexes [{Ru(bpy)2}4(μ4-H4L(1))](PF6)8 and [{Ru(bpy)2}4(μ4-H4L(2))](PF6)8 (bpy = 2,2'-bipyridine) have been prepared by refluxing Ru(bpy)2Cl2 ·2H2O and each ligand in ethylene glycol. The deprotonated complexes [{Ru(bpy)2}4(μ4-L(1))](PF6)4 and [{Ru(bpy)2}4(μ4-L(2))](PF6)4 have been obtained by the reaction of sodium methoxide with [{Ru(bpy)2}4(μ4-H4L(1))](PF6)8 and [{Ru(bpy)2}4(μ4-H4L(2))](PF6)8, respectively, in methanol.