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Thermochemical properties of some f-electron element β-diketonates, and metal-oxygen bond energies. lanthanum(III)β-diketonates

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Abstract

The standard molar enthalpies of formation of the crystalline lanthanum(III) chelate complexes with pentane-2,4-dione (acetylacetone, Hacac) and 1-phenylbutane-1,3-dione (benzoylacetone, Hbzac) were determined by the solution calorimetry method. The following values ofΔH 0f(s) (kJ mol−1) were obtained: La(acac)3', −1916.2±7.0; La(bzac)3 · 2H2O, −2099.1 ±9.7. The enthalpies of the hypothetical complex dissociation reactions in the gaseous phase:

$$LaL_{3(g)} = La_{(g)} + 3L_{(g)} and LaL_{3(g)} = La_{(g)}^{ + 3} + 3L_{(g)}^ - $$

were calculated as a measure of the mean bond dissociation energy, <D>(La-O), and the mean coordinate bond dissociation energy, <DCB>(La-O), respectively.

Zusammenfassung

Die molaren StandardbildungsenthalpienΔH 0f(s) der kristallinen Chelate von Lanthan(III) mit Pentandion(2,4) (Acetylaceton, Hacac) und 1-Phenylbutandion(1,3)(Benzoylaceton, Hbzac) wurden lösungskalorimetrisch bestimmt zu: La(acac)3: ΔH 0f(s) =(−1916.2±7.0) kJ mol−1 La(bzac)3·2H2O:ΔH 0f(s) =−2099,1±9,7) kJ mol−1. Die Enthalpien der hypothetischen Dissoziationsreaktionen in de Gasphase LaL3(g)=La(g)+3L(g) und LaL3(g)=La +3(g) +3 L −(g) als Maß für die mittlere Dissoziationsenergie <D>(La-O) bzw. der mittleren Dissoziationsenergie der koordinativen Bindung <DCB>(La-O) wurden berechnet.

Резюме

Методом калориметри и в растворе определе ны стандартные молярны е энтальпии образования кристал лических хелатных ко мплексов трехвалентного лант ана с пентан-2,4дионом (ацетилацетон, Насас) и 1-фенилбутан-1,3-дионом (бензоилацетон, Hbzac). Полу чены следующие значенияΔ H 0f(s) (кдж·моль−1) для La(acac)3: −1916,2±7,0; для La(bzac)3·2H2O: −2099,1±9,7. Вычислены энталь пии гипотетических р еакций диссоциации комплек сов в газовой фазе:

$$LaL_{3(g)} = La_{(g)} + 3L_{(g)} and LaL_{3(g)} = La_{(g)}^{ + 3} + 3L_{(g)}^ - $$

являющиеся мерой сре дней энергии диссоци ации связи 〈D〉(La-O) и мерой средней эн ергии диссоциации координ ационной связи 〈DCB〉(La-O).

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  1. Institute of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383, Wrocław, Poland

    E. Giera & W. Kqkołowicz

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  1. E. Giera
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  2. W. Kqkołowicz
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Giera, E., Kqkołowicz, W. Thermochemical properties of some f-electron element β-diketonates, and metal-oxygen bond energies. lanthanum(III)β-diketonates. Journal of Thermal Analysis 33, 977–982 (1988). https://doi.org/10.1007/BF02138619

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