A review of recent advances in IR spectroscopy using p-H 2 as a matrix host in our laboratory is presented. The softness of this novel p-H 2 matrix host not only makes high-resolution spectroscopy feasible but also provides new applications. Molecular motion, such as the rotation of C 2 H 4 , internal rotation (torsion) of CH 3 OH, and rotation of CH 3 F about a single axis are characterized in this p-H 2 matrix. In contrast, no evidence for rotation of CH 3 I and CH 3 was found. The diminution of the cage effect leads to the possibility of production of free radicals via either photolysis in situ or bimolecular reactions of molecules with atoms that are produced in situ from their molecular precursors. Taking advantage of these unique features, we identified the IR spectrum of CH 3 produced from photolysis of CH 3 I and CH 3 S produced from photolysis of CH 3 SCH 3 and CH 3 SSCH 3 . The reaction of Cl with CS 2 in solid p-H 2 yields ClSCS instead of ClCS 2 . The reaction of Cl with HCOOH in solid p-H 2 yields only a complex, Cl×HCOOH, not HCl and HOCO. The presence of o-H 2 in trace proportions turned out to be an important factor in the interpretation of IR spectra of species embedded in solid p-H 2 . Experimental techniques to minimize the amount of o-H 2 and to characterize its relative concentration with spectra of H 2 O×o-H 2 are discussed.
A neodymium oxalatophosphonate and its praseodymium analogue, Na[Nd3(H2O)4(C2O4)4(CH3PO3)]·2H2O and Na[Pr3(H2O)4(C2O4)4(CH3PO3)]·2H2O, have been synthesized by a hydrothermal method and characterized by single-crystal X-ray diffraction and thermogravimetric analysis. We studied the photoluminescence spectra of the Nd and Pr compounds as well as the magnetic properties of the Nd compound. The structure consists of layers built of tetramers of edge- and face-sharing NdO9 (or PrO9) polyhedra connected by oxalate and methylphosphonate units, which are linked by zigzag infinite chains of oxalate-bridged NdO9 (or PrO9) polyhedra to form a 3D framework. They are the first examples of lanthanide oxalate-methylphosphonate. The Nd compound displays characteristic emission bands in the near IR region. The χM T value decreases from 1.68 cm3 K/mol Nd at 300 K to 0.659 cm3 K/mol Nd at 2 K. The value at room temperature is close to the theoretical value for a mononuclear Nd3+ species. Luminescence of the Pr compound consists of many emission bands at 480−760 nm. The lifetimes of both compounds are much shorter than the expected values because of the quenching effects of water molecules in the structure. Crystal data for the Nd compound: triclinic, P1̄ (No. 2), a = 9.0682(2) Å, b = 9.5114(3) Å, c = 14.0066(4) Å, α = 74.975(2)°, β = 86.534(2)°, γ = 82.725(2)°, and Z = 2. Crystal data for the Pr compound are the same as those for the Nd compound, except a = 9.125(1) Å, b = 9.549(1) Å, c = 14.073(2) Å, α = 75.086(2)°, β = 86.611(2)°, and γ = 82.545(2)°.
Hyperthermia using ferrofluid with alternating current (AC) magnetic field, which is the principal method we try to use in this study, where chitosan was used as a surfactant agent. Irradiation of Co-60 plays multi-function roles on the syntheses of chitosan-coated nanoparticles. Optimal conditions for synthesizing magnetic nanoparticles have been successfully found by the Taguchi method in which the dominated quality characteristic was SAR.
A spherical amine modified lignin-base adsorbent had been prepared (L-BAA) by condensation polymerization of lignin with epoxy chloropropane and diamines. The modified products were characterized by FTIR spectra and scanning electron microscopy. Few researches on adsorbing Pb (II) of high concentration from aqueous had been reported. The spherical lignin-base adsorbent was used to adsorb Pb (II) of high concentration from aqueous solution. The effect of shaking time, pH value and temperature on adsorption had been investigated in the study. It was indicated that the adsorption was dependent on pH and temperature of Pb (II) aqueous solution. The maximum adsorption capacity was 151.0 mg/g at follow condition: pH value was 4.00 and temperature was 35°C. The adsorption capacity was better than other reported adsorbents.
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