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|Type:||Artigo de periódico|
|Title:||Photomicrocalorimetry: Photosubstitution Of Carbonyl By Phosphites In [mn(η5-c5h4ch3)(co)3]|
de Alencar Simoni J.
Martinho Simoes J.A.
|Abstract:||A photomicrocalorimeter is described for studies of reactions involving oxygen and moisture-sensitive compounds in organic solvents. This calorimeter was used to investigate the thermochemistry of photochemical substitutions of a carbonyl in [Mn(η5C5H4CH3)(CO)3] by P(OR)3 (R Ph or 1Pr). The measured reaction enthalpies in heptane (λ = 400 nm), ΔHr = -15.7 ± 0.5 and -18.6 ± 0.9 kJ mol-1, respectively, were identified with the bond dissociation enthalpy differences D(MnCO) D[MnP(OPh)3] and D(MnCO) D[Mn-P(OiPr)3] in solution. These results are discussed in terms of the basicity of the phosphates, spectroscopic data of the complexes (CO stretching frequencies), and the available thermochemical data for other transition metal-phosphorus(III) ligand interactions. © 1994.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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