Decomposition Of Na Research Articles

Molecular mechanisms of decomposition of hydrated Na+Cl– ion pairs under planar nanopore conditions

The decomposition of Na+Cl– ion pairs under the conditions of a nanoscopic planar pore with structureless walls in a material contact with water vapor at 298 K is simulated by Monte Carlo method. The transition from the state of a contact ion pair (CIP) to the state of solvent-separated ion pair (SSIP) is shown to occur as a result of an increase in the vapor pressure over a pore after exceeding the threshold number of molecules in a hydrate shell. It is found that the planar form of a molecular cluster under the conditions of a narrow pore does not level an abrupt structural transition and the formation of hydrogen bonds in the hydrate shell starts after three molecules are added. The hydrogen bond length under pore conditions is found to be resistant to variations in the hydrate shell size and coincides with that in water under normal conditions.

Study of CdS-ZnS Photocatalyst Loaded with Pd & Pt Embedded on Immobilized Matrix for Decomposition of Na 2 S-Na 2 SO 3 Solution by Solar Energy using Different Sacrificial Substrates and Photosensitiser

Mixed CdS-ZnS photocatalyst (1 : 4 molar ratio) and Pt, Pd loaded mixed semiconductor photocatalysts immobilized on Whatmann No. 1 fitter paper matrix were prepared. Photocatalytic production of hydrogen from Na 2 S-Na 2 SO 3 solution by immobilized photocatalyst using sacrificial agents like EDTA, oxalate, formate etc. and photosensitiser like Ru(bipy) 3 Cl 2 were studied. The maximum photoproduction of hydrogen obtain when mixed CdS-ZnS loaded with Pt (1.5 wt%) photocatalyst immobilized in Whatman No.1 filter paper matrix was used with Ru (bipy) 3 Cl 2 .

ChemInform Abstract: Structural Investigations on Cs2[B12H12

The crystal structure of Cs2(B12H12) has been determined from X-ray single-crystal data collected at room temperature. Dicesium dodecahydro-closo-dodecaborate crystallizes as colourless, face-rich crystals (cubic, Fm 3; a = 1128.12(7) pm; Z = 4). Its synthesis is based on the reac- tion of Na(BH4) with BF3(O(C2H5)2) via the decomposition of Na(B3H8) in boiling diglyme, followed by subsequent se- parations, precipitations (with aqueous CsOH solution) and recrystallizations. The crystal structure is best described as anti-CaF2-type arrangement with the Cs + cations in all tetra- hedral interstices of the cubic closest-packed host lattice of the icosahedral (B12H12) 2- -cluster dianions. The intramolecu- lar bond lengths are in the range usually found in closo-hy- droborates: 178 pm for the B-B and 112 pm for the B-H dis- tance. Twelve hydrogen atoms belonging to four (B12H12) 2- icosahedra provide an almost perfect cuboctahedral coordi- nation sphere to the Cs + cations, and their distance of 313 pm (12 ·) attests for the salt-like character of Cs2(B12H12) according to 3{(Cs + )2((B12H12) 2- )}. The 11 B{ 1 H}-NMR data in aqueous (D2O) solution are d = -12,70 ppm ( 1 JB-H = 125 Hz), and d = -15,7 ppm (linewidth: Dm1/2 = 295 Hz) for the solid state 11 B-MAS-NMR.

Strukturelle Untersuchungen an Cs2[B12H12

Structural Investigations on Cs2[B12H12] The crystal structure of Cs2[B12H12] has been determined from X-ray single-crystal data collected at room temperature. Dicesium dodecahydro-closo-dodecaborate crystallizes as colourless, face-rich crystals (cubic, Fm 3; a = 1128.12(7) pm; Z = 4). Its synthesis is based on the reaction of Na[BH4] with BF3(O(C2H5)2) via the decomposition of Na[B3H8] in boiling diglyme, followed by subsequent separations, precipitations (with aqueous CsOH solution) and recrystallizations. The crystal structure is best described as anti-CaF2-type arrangement with the Cs+ cations in all tetrahedral interstices of the cubic closest-packed host lattice of the icosahedral [B12H12]2–-cluster dianions. The intramolecular bond lengths are in the range usually found in closo-hydroborates: 178 pm for the B–B and 112 pm for the B–H distance. Twelve hydrogen atoms belonging to four [B12H12]2– icosahedra provide an almost perfect cuboctahedral coordination sphere to the Cs+ cations, and their distance of 313 pm (12 ×) attests for the salt-like character of Cs2[B12H12] according to {(Cs+)2([B12H12]2–)}. The 11B{1H}-NMR data in aqueous (D2O) solution are δ = –12,70 ppm (1JB–H = 125 Hz), and δ = –15,7 ppm (linewidth: δν1/2 = 295 Hz) for the solid state 11B-MAS-NMR.

Energy transfer in the gamma radiolysis of alkali and alkaline earth metal nitrates dispersed in sulphate and carbonate matrices

Abstract Gamma radiolysis of NaNo3, KNO3, Sr(NO3)2 and Ba(NO3)2 dispersed in sulphate and carbonate matrices has been studied over a wide absorbed dose range. Radiolytic decomposition of the nitrate salt depends on the concentration of the nitrate in admixture as well as the total absorbed dose. G(NO2) values calculated on the basis of electron fraction of the nitrate salt decrease with the increase in the mol% of the nitrate salt. Percent decomposition of Na and K nitrates in sulphate and carbonate admixtures increases with the absorbed dose over a wide concentration range. An admixture of Sr(NO3)2 (5 mol.%) with SrSO4 and SrCO3 exhibited an increase of G(NO2) by 30 and 20-fold respectively. An enhacement of G(NO2) by 25-fold has been observed in case of (5 mol.%) Sr(NO3)2 + BaSo4 admixture. G(NO2) values for Ba(NO3)2 admixtures with BaSO4, BaCO3 and SrSO4 have been found to be much larger (16-fold) than that for the pure salt. The additives seem to exhibit sensitizing effect causing enhanced decompositi...

The reactions of some compounds of iron, cobalt and nickel with the molten lithium carbonate-sodium carbonate-potassium carbonate eutectic

The reactions of FeCl 2, FeCl 3, CoCl 2, Na 3[Co(NO) 2) 6], [Co(NH 3) 5H 2O]Cl 3 and NiCl 2 with the molten alkali metal carbonate eutectic were investigated. It was found that FeCl 2 and FeCl 3 reacted with the melt to precipitate Fe 2O 3 which was converted into LiFeO 2 on further heating. Cobalt(II) added to the melt as CoCl 2 or produced by the decomposition of Na 3[Co(NO 2) 6] was found to react with the melt to form Co 3O 4 which was also formed in the reaction of [(Co(NH 3) 5H 2O]Cl 3 and was partially converted into LiCoO 2. Nickel(II) chloride reacted to precipitate stable NiO. The molten carbonate eutectic donated oxide ions in these reactions with the evolution of CO 2 which was partially reduced to CO in some reactions.

X-ray photoelectron spectroscopic (X-p.e.s.) studies on in situ photoinduced decomposition of inorganic molecular ions. Part 2.—Na[ClOx] system: mechanistic (x= 3, 4) and variable-temperature (x= 3) investigations

The first-order rate constants for the decomposition of Na[ClO3] and Na[ClO4] when studied by X-p.e.s. are shown to have a linear dependence on the intensity of the ionising radiation used. A simple steady-state model, which emphasises the role of molecular excitons in the decomposition process, is constructed to explain this behaviour. Variable temperature studies in the range 293–113 K indicate that the rate of photo-induced decomposition of Na[ClO3] increases as the temperature is lowered, and analysis of the mode of decomposition suggests that the temperature-dependence arises from thermal deactivation of the molecular exciton, [ClO*3]–.