Thermochemistry of Copper(II) .BETA.-diketonates. II. Bis(benzoylacetonato)copper(II).
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概要
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The standard enthalpy of formation of crystalline bis(benzoylacetonato)copper(II) has been determined at 298.15 K by solution calorimetry: Δ<I>H<SUB>f</SUB></I><SUP>°</SUP>[Cu(bzac)<SUB>2</SUB>] (c)=−143.6±2.2 kcal mol<SUP>−1</SUP>. Enthalpy changes at 298.15 K for the following hypothetical gaseous reactions have been subsequently derived:<BR>Cu(g)+2bzac·(g)=[Cu(bzac)<SUB>2</SUB>](g) Δ<I>H</I>=−165.9±14.3 kcal mol<SUP>−1</SUP><BR>Cu<SUP>2</SUP>+(g)+2bzac<SUP>−</SUP>(g)=[Cu(bzac)<SUB>2</SUB>](g) Δ<I>H</I>=−747.3±14.4 kcal mol<SUP>−1</SUP><BR>The corresponding homolytic(\bar<I>E</I>) and heterolytic(\bar<I>E</I>′) copper(II)-oxygen mean bond energy parameters were calculated as<BR>\bar<I>E</I><SUB>Cu-o</SUB>=41±3 kcal mol<SUP>−1</SUP> and \bar<I>E</I>′<SUB>Cu-o</SUB>=187±3 kcal mol<SUP>−1</SUP><BR>respectively.
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