Lighter Hydrogenation Catalysts Enzymes have evolved to use abundant metals such as iron, cobalt, and nickel for redox catalysis. However, synthetic catalysis has generally relied on the rarer, heavier relatives of these elements: ruthenium, rhodium, iridium, palladium, platinum (see Perspective by Bullock ). Friedfeld et al. (p. 1076 ) used high-throughput screening show that right cobalt precursor can be activated asymmetric hydrogenation using traditional ligands developed precious...

Ultrafine fibers produced by electrospinning often exhibit bead-on-string structures, which have generally been considered to be undesirable "by-products" or defects. Theoretical analysis in the literature predicted three types of instabilities for an electrically driven jet: axisymmetric Rayleigh instability, electric field-induced axisymmetric, and whipping instability. The process bead formation revealed that a beaded structure resulted from deformation flow jet. Applied voltage, solution...

A series of iron(II) (7a−11a) and cobalt(II) (7b−11b) 2-(1-methyl-2-benzimidazolyl)-6-(1-(arylimino)ethyl)pyridyl complexes were synthesized, as well bidentate ligated by 2-(2-benzimidazolyl)-6-methylpyridine, 2-(carboethoxyl)-6-(2-benzimidazolyl)pyridine, 2-(1-methyl-2-benzimidazolyl)-6-acetylpyridine. All organic compounds fully characterized NMR IR spectroscopy elemental analysis, while the metal carefully examined analysis. Their molecular structures determined single-crystal X-ray...

Nitrogen-rich conjugated microporous polymers (NCMPs) have attracted great attention in recent years owing to their polarity, basicity, and ability coordinate metal ions. Herein, three NCMPs, structurally close polyaniline, were facilely synthesized via chemical oxidative polymerization between multiconnected aniline precursors. The NCMPs with high N content (11.84 wt %), intrinsic ultramicroporosity (<1 nm), moderate surface area (485 m2 g–1) show wide-ranging adsorption functionality,...

When activated with base, the iron(II) complexes tetradentate amine(imine)diphosphine ligands, (S,S)-trans-[FeCl(CO)(PAr2-NH-N-PAr′2)]BF4 (1: Ar, Ar′ = Ph; 2: Ar Ph, 4-MeC6H4; 3: 3,5-Me2C6H3), are very active for asymmetric transfer hydrogenation (ATH) of ketones in KOtBu/2-propanol. For ATH, better enantioselectivity, but lower catalytic activity, was observed general when using catalyst precursors bulkier dixylylphosphino groups compared to those diphenylphosphino groups. The were much...

An efficient decolorization strategy for waste polyester textiles and a new purification the glycolysis product were developed combined to enable repeatable use of in textile industry.

The reaction of 1,3-bis(imidazolyl)benzene with excess 1-bromoadamantane at 170 °C for 14 h afforded 1,3-bis(1-adamantylimidazolium)benzene dibromide (1), which was characterized by IR, NMR, and X-ray diffraction. Metathetical anion exchange sodium iodide yielded the N-heterocyclic dicarbene precursor diiodide, (CHimidCHCHimid)I2 (2), in high yield. [Ir(μ-Cl)2(cod)]2 (cod = 1,5-cyclooctadiene) 2 presence 2.2 equiv Cs2CO3 refluxing acetonitrile led to formation unsymmetrical iridium(III)...

The excellent ketone asymmetric transfer hydrogenation (ATH) systems using the precatalysts (S,S)-trans-[FeCl(CO)(PPh2CH2CH2NHCHPhCHPhNCHCH2PAr2)]BPh4 (Ar = Ph (1), p-tolyl (2)) have a fascinating dependence of activity on base concentration, which is investigated here. reaction complex 1 or 2 with equiv strong potassium tert-butoxide in THF for 2–7 days produces neutral amine(ene-amido) complexes [FeCl(CO)(PPh2CH2CH2NHCHPhCHPhNCHCHPAr2)] (8 and 9). These monodeprotonated been completely...

Catalytic asymmetric transfer hydrogenation (ATH) reactions of ketones have become an important tool for producing enantiomerically pure alcohols that are widely used in the syntheses bioactive compounds. However, high toxicities and low abundances traditionally employed precious metals serving as catalyst centers impeded widespread application metal-based catalysts synthesis. Development from abundant less toxic 3d is highly desirable but still challenging. We report herein development...

Iron and cobalt complexes are a new family of catalysts for ethylene oligomerization polymerization. The extensive researches on bis(imino)pyridyl metal have been carried out with the aim synthesizing their derivatives finding suitable reaction parameters optimum activity. Beyond modification works complexes, several alternative models similar coordination sphere developed in our group. This review article describes experiences innovating iron as

PET-RAFT polymerization enables precise polymer synthesis, yet conventional systems require an excess chain transfer agent (CTA) over unbound photocatalysts (PCs). Herein, a self-catalyzed strategy employing polymerizable porphyrin MTPPZnH as dual-functional PC effectively embeds high photosensitizer content into glycopolymers for photodynamic therapy (PDT). Three galactose-bearing monomers (acrylate, methacrylate, 4-vinylbenzoate) were polymerized via under optimized light conditions,...

We describe a stepwise synthesis of the hydrido, N-heterocyclic dicarbene iridium(III) pincer complex [Ir(H)I(C(NHC)CC(aNHC))(NCMe)] (3) which features combination normal and abnormal NHC ligands. The reaction bis(imidazolium) diiodide [(CH(imid)CHCH(imid))]I(2) (1) with [Ir(μ-Cl)(cod)](2) afforded first mono-NHC Ir(I) [IrI(cod)(CH(imid)CHC(NHC))]I (2), was then reacted 2 equiv. Cs(2)CO(3) in acetonitrile at 60 °C for 40 h to yield 3. These observations support our previously proposed...

The unsymmetrical salphen ligand (3,5-tBu-1-OH-C6H2)CH═N-C6H4-N═CH(3-Ph-1-OH-C6H3) (tBu-PhLH2) was designed and synthesized to support aluminum complexes. Its symmetric analogues, (3,5-tBu-1-OH-C6H2)CH═N-C6H4-N═CH(3,5-tBu-1-OH-C6H2) (tBuLH2) (3-Ph-1-OH-C6H3)CH═N-C6H4-N═CH(3-Ph-1-OH-C6H3) (PhLH2), were also explored compared. methane elimination reactions between ligands AlMe3 resulted in formation of tBu-PhLAlMe (1), tBuLAlMe (2), PhLAlMe (3) high yields, which characterized by elemental...

Bis-quaternary ammonium betulin-based dimethacrylate derivatives (Bis-QADM-Bet) were synthesized. Regulating the alkyl chain length of Bis-QADM-Bet endows dental resins with superior antibacterial effects and acceptable physicochemical properties.

Targeted photodynamic therapy (PDT) offers advantages over nontargeted approaches, including improved selectivity, efficacy, and reduced side effects. This study developed star-shaped glycopolymeric photosensitizers using porphyrin-based initiators via ATRP. Incorporating a porphyrin core gave the polymers fluorescence ROS generation, while adding fructose solubility targeting capabilities. The had high light absorption, singlet oxygen production, specificity, low dark toxicity,...