44247-54-3Relevant academic research and scientific papers
Syntheses, structures and properties of 1-ethyl-3-methylimidazolium salts of fluorocomplex anions
Matsumoto, Kazuhiko,Hagiwara, Rika,Yoshida, Ryuhei,Ito, Yasuhiko,Mazej, Zoran,Benkic, Primoz,Zemva, Boris,Tamada, Osamu,Yoshino, Hideaki,Matsubara, Seijiro
, p. 144 - 149 (2004)
Fluoroacid-base reactions of a room-temperature ionic liquid, 1-ethyl-3-methylimidazolium fluorohydrogenate (EMIm(HF)2.3F, EMIm = 1-ethyl-3-methylimidazolium cation), and Lewis fluoroacids (BF3, PF5, AsF5, NbF5, TaF5 and WF6) give EMIm salts of the corresponding fluorocomplex anions, EMImBF4, EMImPF6, EMImAsF6, EMImNbF6, EMImTaF6 and EMImWF7, respectively. Attempts to prepare EMImVF6 by both the acid-base reaction of EMIm(HF)2.3F with VF5 and the metathesis of EMImCl with KVF6 failed due to the strong oxidizing power of the pentavalent vanadium, whereas EMImSbF6 was successfully prepared only by the metathesis of EMImCl and KSbF6. EMImBF4, EMImSbF6, EMImNbF6, EMImTaF6 and EMImWF7 are liquids at room temperature whereas EMImPF6 and EMImAsF6 melts at around 330 K. Raman spectra of the obtained salts showed the existence of the EMIm cation and corresponding fluorocomplex anions. IR spectroscopy revealed that strong hydrogen bonds are not observed in these salts. EMImAsF6 (mp 326 K) and EMImSbF6 (mp 283 K) are isostructural with the previously reported EMImPF6. The melting point of the hexafluorocomplex EMIm salt decreases with the increase of the size of the anion (PF6- 6- 6- 6- ≈ TaF6-).
The standard molar enthalpy of formation at 298.15 K of VS1.043 by combustion calorimetry in fluorine
Lewis, Brett M.,O'Hare, P. A. G.,Mukdeeprom, Pannee,Edwards, Jimmie G.
, p. 1325 - 1331 (2007/10/02)
The standard molar enthalpy of formation ΔfH0m of VS1.043 has been determined by fluorine-combustion calorimetry.The results obtained, -(230.3+/-2.2)kJ*mol-1 at 298.15 K and p0 = 101.325 kP
SENSITIZED LUMINESCENCE OF VF5 UNDER THE ACTION OF THE EMISSION OF A PULSED CO2 LASER.
Klimov,Kuz'menko,Legasov,Udalova
, p. 586 - 589 (2007/10/02)
Study of sensitized visible luminescence of VF//5, which accompanies its dissociation, under the action of emission from a pulsed CO//2 laser is described.
