Search Results

You are looking at 1 - 10 of 21 items for :

  • Chemistry and Chemical Engineering x
  • Refine by Access: All Content x
Clear All

Abstract  

A barium-iron(III) [BaFe(cr-salen)(py)2](ClO4)3 (1) was prepared and an iron(III) complex [Fe(cr-salen)(py)2]ClO4 (2) complex was obtained by removing Ba2+ ion from the barium-iron(III) complexes with guanidinium sulfate. These complexes are in the high-spin state both in the solid state and in acetonitrile. Single crystals of [BaFe(cr-salen)(MeOH)2]2O(ClO4)4·2MeOH (3) were obtained by slow evaporation of a solution of (2) and Ba(ClO4)2, and the single crystal X-ray structure of (3) was determined: Crystal data for [BaFe(cr-salen)(MeOH)2]4O2(ClO4)4·2MeOH: C25H36N2O17.5Cl2BaFe, are: space group C2/c, Z=8, a=24.79(7) Å, b=16.11(6) Å, c=17.24(6) Å, V=6753(36) Å3, R=0.133, Rw=0.154. The structure of the complex has a one order polymeric chain. An iron atom is located in a cavity of square pyramidal geometry and bridged by an oxygen atom of μ-oxo. A barium ion is sitted in a quasi-crownether ring and bridged by two perchlorate anions.

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: S. Aukkaravittayapun, C. Thanachayanont, T. Theapsiri, W. Veerasai, Y. Sawada, T. Kondo, S. Tokiwa, and T. Nishide

Abstract  

Fluorine-doped tin dioxide (FTO) films were deposited on silicon wafers by inverted pyrosol technique using solutions with different doping concentration (F/Sn=0.00, 0.12, 0.75 and 2.50). The physical and electrical properties of the deposited films were analyzed by SEM, XRF, resistivity measurement by four-point-probe method and Hall coefficient measurement by van der Pauw method. The electrical properties showed that the FTO film deposited using the solution with F/Sn=0.75 gave a lowest resistivity of 3.210–4 ohm cm. The FTO films were analyzed by temperature programmed desorption (TPD). Evolved gases from the heated specimens were detected using a quadruple mass analyzer for mass fragments m/z, 1(H+), 2(H2 +), 12(C+), 14(N+), 15(CH3 +), 16(O+), 17(OH+ or NH3 +), 18(H2O+ or NH4 +), 19(F+), 20(HF+), 28(CO+ or N2 +), 32(O2 +), 37(NH4F+), 44(CO2 +), 120(Sn+), 136(SnO+) and 152(SnO2 +). The majority of evolved gases from all FTO films were water vapor, carbon monoxide and carbon dioxide. Fluorine (m/z 19) was detected only in doped films and its intensity was very strong for highly-doped films at temperature above 400C.

Restricted access

Empirical formula C 24 H 51 N 24 O 18 La C 24 H 49 N 24 O 17 Y Formula weight 1102.80 1034

Restricted access

In non-activated glasses, AlPO 4 crystallizes, and in some, also Al 2 O 3 (corundum). The latter is not present when the glass contains iron. Aluminum also forms the sodium aluminate NaAl 11 O 17 , and iron is present in the form of the phosphate

Open access

.009 0.011 C16–O17 1.220 1.214 1.781 1.846 0.009 0

Restricted access

.47(72) O1–H1···O17 0.820(11) 2.864(13) 3.605(16) 151.16(76) O2–H2···O14 0

Restricted access

phenomenon can be explained by the escape of chlorine accompanying the reaction of CaCl 2 with glass components. XRD analysis of sinters with the Aa glass showed crystallization AlPO 4 and also sodium aluminate Na Al 11 O 17 in glass. As a result

Open access

.5 ( VI ) Lu(4-bpy) 2 (CCl 3 COO) 3 ·2H 2 O 17.39 (17.31) 31.10 (30.90) 5.39 (5.54) 2.03 (1.99) 54.0 6.3 7

Restricted access

crystallization of the LC1-xSilx system . J Phys Chem B 111 : 1916 – 1922 10.1021/jp067736o . 17. Sharma , D 2008 Calorimetric study of activated kinetics of the nematic and

Restricted access

oxides NaLaNb 2 O 7 ·1.6H 2 O [ 15 , 16 ] and NaLaTa 2 O 7 ·1.9H 2 O [ 17 ] but intermediate compounds have never been isolated and characterized. Fig. 5 TG curve and XRD patterns of NaNdTa 2 O 7 ·1.35H 2 O

Restricted access