The phosphorus-functionalized cycloheptatrienyl cyclopentadienyl (Cht Cp) titanium sandwich complex [(η7-C7H7)Ti(η5-C5H4PtBu2)] ( 7 ) forms a frustrated Lewis pair (FLP) in combination with the borane B(C6F5)3, and this FLP undergoes heterolytic cleavage of dihydrogen and fixation of carbon dioxide and nitrous oxide with a noticeable colorimetric response, which is visible to the naked eye. In their UV/Vis spectra, the H2, CO2 and N2O fixation products exhibit a bathochromic shift of the absorption band that can be assigned to a HOMO LUMO excitation of the Cht Cp titanium (troticene) moiety. 相似文献
A method for using amine–borane complexes directly in palladium catalyzed borylation has been developed. The reaction proceeds through the sequential formation of a boronium species followed by deprotonation leading to the aminoborane. This reagent is then directly used in the borylation process leading, after work‐up, to various boronic acid derivatives. The reaction was applied to (hetero)aryl triflates, iodides, bromides and chlorides.
Heterobimetallic Lewis acid catalysts are broadly useful and methods to recycle them have immediate applications. However, their immobilization through covalent binding can be challenging. Non‐covalent immobilization of supported asymmetric catalysts is attractive due to ease of preparation and potential for reversible binding. We report a novel non‐covalent binding strategy for Shibasaki’s REMB framework {RE=rare earth metal; M=Li, Na, K; B=BINOL; RE:M:B=1:3:3, [M3(sol)n][(BINOLate)3RE] } and explore the reactivity of the supported catalyst.
Coordination complexes of formula [ML2], [CoL3], [Pd(HL)Cl2], [CuLCl(H2O)] and [CuL2(H2O)2] {L=anion of N-ethyl-N′-(4′-methylthiazol-2′-yl)thiourea; M=PtII, PdII or NiII} were prepared and characterized by elemental analyses, magnetic susceptibilities, and by IR, NMR, electronic and mass spectral measurements. 相似文献
The transition metal complexes of triaminoguanidine(TAG-M,where M=Cobalt(Co)or Iron(Fe))have been prepared.The catalytic effect of these complexes on the thermolysis of energetic composite based on nitrocellulose and diethyl-ene glycol dinitrate,has been investigated.Extensive characterization of the resulting energetic composites was carried out u-sing scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and dif-ferential scanning calorimetry(DSC).Isoconversional kinetic analysis was performed to determine the Arrhenius parameters as-sociated with the thermolysis of the elaborated energetic formulations.It is found that TAG-M complexes have strong catalytic effect on the thermo-kinetic decomposition of NC/DEGDN by decreasing the apparent activation energy and significantly in-creased the total heat release.The models that govern the decomposition processes are also studied,and it is revealed that dif-ferent reaction processes are accomplished by introduction metal complexes of triaminoguanidine.Overall,this study serves as a valuable reference for future research focused on the investigation of catalytic combustion features of solid propellants. 相似文献
A series of electrically conducting low density polyethylene/poly(p-azidoaniline) blends containing different loadings of poly(p-azidoaniline) was prepared. The resistance of these blends to accelerated thermal oxidation at 90°C for different time intervals was investigated. The thermal degradation mechanism was determined by attenuated total reflection-Fourier transform infrared technique. The values of melting temperature (Tm), enthalpy of fusion (ΔHm), and degree of crystallinity showed significant increase upon poly(p-azidoaniline) addition. X-ray diffraction patterns also confirmed increase in degree of crystallinity upon blend formation. Furthermore, scanning electron microscopy observations showed efficient thermal stabilization of low density polyethylene/poly(p-azidoaniline) blends. The mechanical properties showed significant role of poly(p-azidoaniline) as thermal stabilizer for low density polyethylene. 相似文献
