Chitosan-g-poly[(2-dimethylamino)ethyl methacrylate] was investigated as a CO2-switchable emulsifier in this study. Poly(2-dimethylamino)ethyl methacrylate (PDMAEMA) was prepared by atom transfer radical polymerization followed by grafting to chitosan (CS). The CO2-responsiveness and reversible ...

Interpenetrating network (IPN) hydrogels based on nanofibrillated cellulose (NFC) and poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA)were prepared via crosslinking free radical polymerization. Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetri...

The structure of poly((2-dimethylamino)ethyl methacrylate)/sodium dodecylsulfate complexes in water was investigated as a function of poly((2-dimethylamino)ethyl methacrylate) concentration at a fixed sodium dodecylsulfate concentration using small angle neutron scattering. When either hydrogena...

In the present study, a novel hydrogel based on the polysaccharide, ‘Karaya gum’ has been synthesised by graft copolymerization and evaluated as an adsorbent for the removal of ionic dyes from aqueous solution. The hydrogel was made by simultaneous grafting and cross linking of Karaya gum usin...

The pH sensitive 2-hydroxyethyl methacrylate (2 - dimethylamino) ethyl methacrylate, (HEMA-DMAEMA) stimuli-responsive hydrogel is used in microfluidic devices as sensors and actuators. This hydrogel responds to an acidic external environment with a subsequent volume change. This actuation requir...

The separation and determination of the vanadium(V) ternary complex formed with 4-(2-pyridylazo)resorcinol (PAR) and hydrogen peroxide using ion-interaction reversed-phase high-performance liquid chromatography on a C18 column has been investigated. The optimal mobile phase was a methanol–water...

Complex species involved in the spectrophotometric determination of cobalt with 4-(2-pyridylazo)resorcinol (PAR = H2R) were studied in solution and in the solid state. An anionic [Co(III)R2]- species was extracted from aqueous solution in chloroform by tetraphenylarsonium or tetraphenylphosphoni...

A selective and sensitive method for the spectrophotometric determination of the total amount of vanadium based on the reaction with 4-(2-pyridylazo)-resorcinol, PAR, and hydrogen peroxide is proposed. The formed complex shows maximum absorbance at 542 nm with molar absorptivity=1.85×104 l mol−...

The nature of the complexes produced in the reaction between Zn(II) or Cd(II) and 4-(2-pyridylazo)resorcinol (PAR), sorbed on a Sephadex QAE anion exchanger have been studied. The visible and IR absorption spectra of the species fixed on the exchanger have been established; the stoichiometry of ...

Iminophosphanes [RO-PNAr] (R = Me, 2-MeC6H4; Ar = 2,4,6-But3C6H2) 1a,b react with RhCIL3 (L = Ph3P) via ligand exchange to give KP-iminophosphane complexes of rhodium(i) [RhCI(MeOPNAr)2L] 2 and [PhCI(2-MeC6H4OPNAr)L2] 3. Under analogous conditions, P-halogenoiminophosphanes [X-PNAr] (X = CI, Br,...

A comparison between polymer-supported chlorotris(triphenylphosphine)rhodium(I) catalyst, P—Ph2PRh(Ph3P)2Cl, and its homogeneous analog in the selective hydrogenation of polynuclear heteroaromatic compounds provides evidence for differences in initial rates and in ability to exchange aromatic h...

The 31P chemical shielding tensors, and their direction cosines, of the three chemically different phosphorus nuclei in chlorotris(triphenylphosphine) rhodium(I) were determined in single-crystal studies using high-resolution cross-polarization NMR with proton decoupling. The tensors are not axi...

A comparison has been made between the amount of hydrogen absorbed per mole of chlorotris(triphenylphosphine)rhodium(I) and the amount of hydrogen quantitatively recoverable by an inert gas purging technique. A discrepancy between these two types of measurements has been found in benzene, methyl...

Iron-porphyrin (5,10,15,20-tetraphenyl-21H, 23H-porphine iron(III) chloride) was used in combination with single-wall carbon nanotubes (SWNTs) to modify a glassy carbon electrode (GCE). The electrochemical behavior of Sudan I on the iron-porphyrin-SWNT-DMF (N,N-dimethylformamide) modified GCE wa...

A Cu(OTf)2-catalyzed and TsNCO-mediated three-step tandem synthesis of 9-arylfluorenes were developed from biphenyls and aryl aldehydes, by which the electron-poor 9-aryl substituted fluorenes were synthesized smoothly. Its success is mainly attributed to use an anhydrous synthesis of N-tosyl ar...

A highly regioselective rhodium-catalyzed intermolecular [2+2+2] cycloaddition of terminal alkynes with a variety of isocyanates to provide 2- and 4-pyridones has been developed. This reaction proceeds in good to excellent yields and overcomes the problem of dimerization and trimerization throug...

The title transformation can be achieved by the o-C–H cleavage of alkynyl aryl ethers, which is easily derived from phenols, followed by the insertion/annulation with isocyanates in the presence of a palladium catalyst. Various alkynyl aryl ethers and arylisocyanates are applied to this transfo...

Base-induced cycloaddition of ethyl isocyanoacetates to trifluoroacetimidoyl chlorides gives ethyl 5-trifluoromethylimidazole-4-carboxylates with high regioselectivity.

FT-IR (4000–400 cm–1) and FT-Raman (3500–100 cm−1) spectral measurements of 4-chloro-3-nitrobenzaldehyde have been done. Ab initio (HF/6-311+G(d,p)) and DFT (B3LYP/6-311+G(d,p)) calculations have been performed giving energies, optimized structures, harmonic vibrational frequencies, infrared ...

The selective mono-N-methylation of anilines derivatives was achieved under mild conditions using inexpensive methanol as C1 source. Under hydrogen borrowing conditions, using a tridentate PN3P manganese pre-catalyst (5 mol%), a catalytic amount of base (20 mol%), for 24 h at 120 °C, a large va...