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Thermochemistry of (germanium + tellurium): II. Molar enthalpies of dissociation of bonds in GeTe(g), GeTe2(g), and Ge2Te2(g)

✍ Scribed by P.A.G. O’Hare

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
308 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

Well established thermochemical values yield the enthalpy of dissociation of GeTe(g): D°m(GeTe) =(396.723.3) kJ•mol -1 at T : 0. The same quantity estimated from spectroscopic measurements is uncertain. The mean enthalpy of dissociation D°m of the Ge-to-Te bonds in GeTe2(g) is (30324) kJ•mol -1 , and D°m(Te-GeTe)=( 21028) kJ•mol -1 . Thus, D°m(Te-GeTe)/D°m(GeTe) 1 0.5, a relation found earlier for other diatomic and triatomic molecules of the chalcogenides of Group 14. In the cyclic compound Ge2Te2(g), the D°m of the four Ge-to-Te bonds is ( 22423) kJ•mol -1 . These values of D°m(GeTe) and D°m follow the progression expected for nominal triple, double, and single G-to-Te bonds in GeTe(g), GeTe2(g), and Ge2Te2(g), respectively.

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