A series of iron complexes ligated by 2-imino-1,10-phenanthrolinyl ligands, LFeCl2 (L = 2-(ArNCR)-1,10-phen), were synthesized and sufficiently characterized elemental spectroscopic analysis along with X-ray diffraction analysis. Activated methylaluminoxane (MAO) or modified (MMAO), these iron(II) show high catalytic activities up to 8.95 × 107 g mol-1(Fe) h-1 for ethylene oligomerization. The distribution oligomers produced follows Schluz−Flory rules selectivity α-olefins. Both the steric...

UiO-66-NH2, a zirconium-based functional metal–organic framework (MOF), was postsynthetically modified via Schiff base reaction between aldehyde groups in glutaraldehyde and amino UiO-66-NH2 CO2-preabsorbed polyethyleneimine (PEI). The resulting PEI-modified MOFs, abbreviated as PEIC@UiO, were characterized with 1H NMR, Fourier transform infrared, powder X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, thermogravimetric analysis evaluated CO2 adsorbents. In comparison...

Abstract A series of 2‐imino‐9‐phenyl‐1,10‐phenanthrolines 1 – 6 has been prepared and investigated as new tridentate N3 ligands in coordination with metal chlorides. Their iron(II) ( 1a 6a ), cobalt(II) 1b 6b nickel(II) 1c 6c ) complexes have synthesized characterized by elemental spectroscopic analysis conjunction single‐crystal X‐ray diffraction studies. Some the iron show good activities selective dimerization ethylene upon treatment MAO or MMAO, while cobalt higher than their analogues...

A one-pot eco-friendly method was developed based on maleic anhydride esterification to produce high quality cellulose nanofibrils and performance nanopaper films.

Hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content (>95.0%) has been prepared via a two-step method by taking commercial butadiene rubber (BR9000) as starting material, including the one-pot synthesis of aldehyde-group-terminated (ATPB) in efficiency and subsequent reduction reaction. The double bonds distributed linear were first epoxidized then cleaved at exact sites. epoxidation reaction 3-chloroperbenzoic acid chain-cleavage periodic are controllable, highly efficient,...

Abstract Two series of amine‐functionalized Zr‐based mixed‐linker metal–organic frameworks (MOFs; UiO‐66‐Mix and UiO‐67‐Mix) have been synthesized with different ratios 1,4‐benzenedicarboxylate/2‐amino‐1,4‐benzenedicarboxylate 4,4′‐biphenyldicarboxylic acid/2‐amino‐biphenyl‐4,4′‐dicarboxylic acid incorporated into their structures. The pendant amino groups were postmodified by the condensation reaction pyridine‐2‐carboxaldehyde, Pd metal centers anchored onto MOFs coordination to...

MOFs-containing nickel catalysts have been synthesized through postsynthetic modification of mixed-linker MOFs (Zn₄O(BDC)_x(ABDC)_3−x) and used for ethylene oligomerization.

Searching for highly efficient and robust CO2 adsorbents is very important capture, utilization, storage. In this study, new polyethylenimine-grafted metal–organic framework (MOF)–polymer composites, abbreviated as PEI@PGD-H, were synthesized via high internal phase emulsion (HIPE) template polymerization of divinylbenzene glycidyl methacrylate, followed by in situ generation HKUST-type MOF the presence hydrophobic-modified CuO nanoparticles reaction with 1,3,5-benzenetricarboxylic acid then...

A series of polyurethanes have been prepared from hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content and commercial free-radical-polymerized HTPB (FHTPB). The mechanical properties cured polyurethane (PU) samples studied by tensile testing dynamic analysis (DMA), their thermal tested differential scanning calorimetry (DSC) thermogravimetric (TGA). NCO/OH ratio, chain extension coefficient (r), microstructure FHTPB a large influence on the PUs. Meanwhile, cyclic indicated that...

Abstract A means of correlation between the activity and net charge, metal atom charge (MANCC), which was successful in prediction early‐transition catalysts, has been used to study catalytic activities salicylaldiminato Ni(II) complexes, late‐transition olefin polymerization or oligomerization. comparison with available quantum mechanics/molecular mechanics (QM/MM) calculation data suggests that even without a detailed mechanism, MANCC results mostly agree QM/MM regarding insertion barrier...

Abstract A series of 2‐(benzimidazol‐2‐yl)‐1,10‐phenanthrolines and their nickel(II) complexes were synthesized characterized by elemental spectroscopic analysis along with single‐crystal X‐ray crystallography. diffraction revealed that 1a 6a have a six‐coordinate distorted octahedral geometry due to the coordination solvent molecules, whereas 3a is centrosymmetric dimer in solid state 5b displays five‐coordinate trigonal‐bipyramidal geometry. Upon activation diethylaluminum chloride (Et 2...

A series of cobalt(II) complexes bearing 3-aryliminomethyl-2-hydroxybenzaldehydes (tridentate [NOO] ligands) was prepared and characterized by FT-IR elemental analysis along with single-crystal X-ray diffraction. The diffraction revealed that a dinuclear centrosymmetrical structure formed, in which each cobalt atom is surrounded two bridged ligands acetate groups as distorted octahedron. These displayed high catalytic activities for the polymerization 1,3-butdiene on activation...

Karst topography is a special landscape shaped by the dissolution of one or more layers soluble bedrock, usually carbonate rock such as limestone dolomite. Due to subterranean drainage, overland flow, extraction water plants and evapotranspiration, there may be very limited surface water. The hydraulic architecture that use adapt karst interesting, but few systematic reports exist. area in southwestern China unique when compared with other areas at similar latitudes, because its abundant...

The covalent cross-linked structure imparts strong elasticity and environmental resistance to elastomers, while the irreversibility of bonds restricts recycling rubbers. Integrating vitrimer chemistry into chemical networks appears be a charming method combine exciting properties thermoplastics thermosets. However, it is still challenge design rubber with robust mechanical properties. Here, inspired by supramolecular interactions associated natural materials, we demonstrated dual reversible...