13283-31-3Relevant articles and documents
Fehlner, T. P.,Koski, W. S.
, p. 409 - 413 (1965)
SmB6 nanoparticles: Synthesis, valence states, and magnetic properties
Bao, Lihong,Chao, Luomeng,Li, Yingjie,Ming, Ming,Yibole,Tegus
, p. 19 - 23 (2015)
Nanocrystalline SmB6 particles were synthesized by the solid-state reaction of Sm2O3/SmCl3 with NaBH4 in the temperature range of 1000-1200 °C. The phase composition, grain morphology, microstructure and valence states of SmB6 were investigated by using XRD, FESEM, HRTEM and XANES. It is interestingly found that the SmB6 nanocrystalline particles with size of 50 nm are easily prepared by using SmCl3 as raw material. The FFT patterns of HRTEM images reveal that the SmB6 nanocrystalline particles have a high crystallinity with cubic structure. The XANES results show that the valence state of Sm is more likely Sm3+. The magnetic measurement shows that the SmB6 nanoparticles show paramagnetic behavior, but there is a small anomaly in the paramagnetic state. The present synthesis technique is novel and invaluable for developing highly crystallized SmB6 nanoparticles.
Gas-Phase Reaction Kinetics of BH
Rice, Jane K.,Caldwell, N. J.,Nelson, H. H.
, p. 3600 - 3605 (1989)
Ground-state BH, generated from the photodissociation of BH3CO at 193 nm and monitored by laser-induced fluorescence, is reacted with NO, H2O, O2, CO2, CO, H2, CH4, C3H8, C2H4, and (CH3)2C=C(CH3)2 at 298 K.Values of the absolute rate constants for these reactions were extracted from observed BH concentration decay profiles (units of cm3 s -1): NO (1.35 +/- 0.20) x 10-10; H2O, (9.75 +/- 1.64) x 10-12; O2, (8.08 +/- 1.20) x 10-13; CO2, (2.64 +/- O.41) x 10-14; C3H8, (7.57 +/- 1.34) x 10-15; C2H4, (1.17 +/- 0.18) x 10-10; (CH3)2C=C(CH3)2, (1.87 +/- 0.30) x 10-10.The indicated ucertainties are +/- (2? plus estimated uncertainties in the measurement).An upper limit of 10-16 cm3s-1 is placed on the rate constant for reaction with CH4.The measured rate constants for the reaction of BH with CO and H2 show a dependence on total pressure.For the reaction BH + H2, we observe a large portion of the falloff region and are able to fit the data using the expression developed by Troe, leading to an estimated value for the limiting high-pressure rate constant of (3.67 +/- 0.91) x 10-13 cm3s-1.For the reaction of BH with CO, measured rate constants could not be extrapolated to the high-pressure limit and therefore were modeled by using a transition-state theory-RRKM approach.
IN-SITU FTIR EMISSION SPECTROSCOPY ON CHEMICAL VAPOUR DEPOSITION PROCESSES
Hopfe, V.,Wagner, D.,Klobes, P.,Herzig, S.,Marx, G.
, p. 115 - 130 (1990)
Infrared emission spectroscopy is a suitable method of detecting transient species in the gas phase and on the surface of growing layers inside a chemical vapour deposition process.The required high level of spectroscopic data results in the refinement of IR Fourier spectroscopy, the optimization of measuring conditions and the application of special modulation and spectra processing techniques.Results of the gas voronizing process of steel from BCl3/H2 mixtures and of the deposition of silicon carbide hard coatings from methyltrichlorosilane show the advantages of these techniques.In the gas phase transient species are detectable, e.g.HBCl2, H2BCl, BCl2 in the boron system and SiCl2, SiCl3, CH3, SiH2, Si2H4 in the silicon system, respectively.While on the metalic ironboride layer B-H, B-Cl and Fe-Cl species are found.
Harrison, J. A.,Meads, R. F.,Phillips, L. F.
, p. 125 - 129 (1988)
Tanaka,Risch
, p. 1015 (1970)
Photodissociation Dynamics of BH3CO at 193 nm
Weiner, Brad R.,Pasternack, L.,Nelson, H. H.,Prather, K. A.,Rosenfeld, R. N.
, p. 4138 - 4142 (1990)
The photodissociation dynamics of the reaction BH3CO --> BH3 + CO at 193 nm have been investigated by using time-resolved infrared absorption spectroscopy and ultraviolet/visible emission spectroscopy.Partitioning of the available energy into the translational and vibrational degrees of freedom has been measured for the nascent CO photofragment.Time-resolved carbon monoxide laser absorption spectroscopy has been used to observe the CO photofragment in vibrationals levels v'' = 0-4.The nascent CO photofragment can be characterized by a vibrational temperature, Tvib = 2760 +/- 160 K.A lower limit to the CO translational energy, Etrans(v''=0) >= 5 kcal/mol, has been established by measuring the Doppler profile of two CO absorption lines with a tunable diode laser absorption system.Time-resolved tunable diode laser absorption spectroscopy has also been employed to observe internal excitation in the nascent BH3 photofragment, as well as measure the quantum yield for its production from BH3CO photolysis.A lower limit for the quantum yield, Φ193(BH3) >= 0.7+0.3-0.2, has been established.By comparison with limiting case models, we conclude that the photodissociation of BH3CO at 193 nm leads to a nonstatistical partitioning of energy into the BH3 fragment.
Rice, Jane K.,Douglass, C. H.,Nelson, H. H.
, p. 109 - 122 (1990)
Single-pot synthesis of zinc nanoparticles, borane (BH3) and closo-dodecaborate (B12H12)2- using LiBH 4 under mild conditions
Ghanta, Sekher Reddy,Rao, Muddamarri Hanumantha,Muralidharan, Krishnamurthi
, p. 8420 - 8425 (2013)
Reduction of ZnCl2 using LiBH4 in mesitylene yielded zinc nanoparticles (Zn-NPs), borane (BH3) and closo-dodecaborate (B12H12)2-. The BH3 evolved gas was trapped as Ph3/sub
NOVEL 3, 4-PROPYLENEDIOXYTHIOPHENE DERIVATIVES WITH PENDANT FUNCTIONAL GROUPS
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Page/Page column 9-10, (2010/11/24)
The present invention relates to the syntheses of 3,4-propylenedioxythiophenes of the formula (I) wherein R represents a n-valent linear or branched, optionally substituted, aliphatic C1-Cn radical and Y represents a pendant functional group. Further, methods for the preparation of the said compounds are disclosed.
