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Thermochemistry of gaseous methanide, C4- and ethynide, C-2(2-) ions
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UNSPECIFIED (1996) Thermochemistry of gaseous methanide, C4- and ethynide, C-2(2-) ions. ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 194 (Part 2). pp. 165-179. ISSN 0942-9352.
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Abstract
Ionic models adopted for the methanides, Be2C and Al4C3 lead to the calculation of the enthalpy of formation of the gaseous anion, Delta(f)H degrees(C4-, g)/kJ mol(-1) = 6018+/-200 and of the total lattice potential energies of these salts to be: 12218+/-150 and 39790+/-250 respectively. For the corresponding ethynide anion, a value of 920+/-8 kJ mol(-1) is assigned to Delta(f)H degrees(C-2(2-), g). A thermochemical radius/nm of 0.161 nm found for the C4- anion and the corresponding value of 0.185 nm for the C-2(2-) anion is utilised to predict the lattice energies U-POT/kJ mol(-1) of MgC2 (=3209+/-30), Li2C2 (=2401+/-24) and Na2C2 (=2260+/-20). Ehthalpies for the processes: C4- (g) --> C- (g) + 3e; C-2(2-) (g) --> 2 C- (g); C-2(2-) (g) --> C-2(+) (g) + 3e and C2- (g) + 6e --> 2 C4- (g) are assigned to be: -5429+/-153 kJ mol(-1) (-56.2+/-1.6 eV), 1084+/-35 kJ mol(-1) (11.2+/-0.4 eV), 257+/-8 kJ mol(-1) (2.7+/-0.1 eV) and 11116+/-216 kJ mol(-1) (115+/-2 eV) respectively.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS | ||||
Publisher: | R OLDENBOURG VERLAG | ||||
ISSN: | 0942-9352 | ||||
Official Date: | 1996 | ||||
Dates: |
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Volume: | 194 | ||||
Number: | Part 2 | ||||
Number of Pages: | 15 | ||||
Page Range: | pp. 165-179 | ||||
Publication Status: | Published |
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