CALORIMETRY OF LANTHANUM TRIHALIDES AND OF AMMONIUM LANTHANUM HALIDES

Authors
OPPERMANN H MORGENSTERN A EHRLICH S
Citation
H. Oppermann et al., CALORIMETRY OF LANTHANUM TRIHALIDES AND OF AMMONIUM LANTHANUM HALIDES, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 52(9), 1997, pp. 1062-1066
Citations number
21
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur Naturforschung. B, A journal of chemical sciences → ACNP
ISSN journal
09320776
Volume
52
Issue
9
Year of publication
1997
Pages
1062 - 1066
Database
ISI
SICI code
0932-0776(1997)52:9<1062:COLTAO>2.0.ZU;2-N
Abstract
By determination of the enthalpies of solution of lanthanum oxide and of lanthanum trihalides in 4n HX we derived the enthalpies of formatio n of the trihalides at 298 K using tabulated data. On the basis of the se data and measured enthalpies of solution in 4n HX of diammonium lan thanum pentahalides, the enthalpies of formation of (NH4)(2)LaX5 were obtained. Delta H-B degrees(LaCl3,f,298) = -2.58,5 +/- 0,8 kcal/mol; D elta H-B degrees((NH4)(2)LaCl5,f,298) = 411,5 +/- 1,4 kcal/mol; Delta H-B degrees(LaBr3,f,298) = -218,7 +/- 1,7 kcal/mol; Delta H-B degrees( (NH4)(2)LaBr5,f,298) = 352,8 +/- 2,5 kcal/mol; Delta H-B degrees(LaI3, f,298) = -166,9 +/- 2,0 kcal/mol; Delta H-B degrees((NH4)(2)LaI5,f,298 ) = -264,7 +/- 3,0 kcal/mol.