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
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
Date:	1996
Volume:	194
Number:	Part 2
Number of Pages:	15
Page Range:	pp. 165-179
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18384

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