The mean enthalpy of the lanthanide-oxygen bond in 2,2,6,6-tetramethyl-3,5-heptanedione chelates of praseodimium and holmium |
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| Authors: | Claudio Airoldi Luiz S Santos Jr |
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| Institution: | (1) institute de Química, Universidade Estadual de Campinas, São Paulo, Brasil;(2) Present address: Departamento de Química, Universidade Federal do Piauí, 64000 Teresina, Piauí, Brasil;(3) Institute de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13081 Campinas, São Paulo, Brasil |
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| Abstract: | The general thermochemical reaction LnCl3·6H2O(c)+3Hthd(1)+73.92H2O(1) = Ln(thd)3(c) +3HCl·26.64H2O(aq);  rHm (Ln = Pr, Ho and thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) was employed to determine through solution-reaction calorimetry at 298.15 K the standard molar enthalpies of formation of crystalline chelates, –2434.3±11.5 (Pr) and –2384.8±11.5 (Ho) kJ mol–1. These values and the corresponding molar enthalpies of sublimation enabled the determination of the standard molar enthalpies of chelates in the gaseous phase. From these values the mean enthalpies of the lanthanide-oxygen bond, 265±10 (Pr) and 253±10 (Ho) kJ mol–1 were calculated. |
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| Keywords: | Thermochemistry 2 2 6 6-tetramethyl-3 5-heptanedione mean enthalpy  -diketonates" target="_blank">gif" alt="beta" align="MIDDLE" BORDER="0">-diketonates lanthanide elements lanthanide-oxygen bond |
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