Synthesis and structural properties of Anhydrous Rare Earth Cinnamates, [RE(cinn)3]
Data(s) |
01/01/2007
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Resumo |
Anhydrous rare earth tris(cinnamates) [RE(cinn)3] (RE = La–Lu, Y and Sc and cinnH = trans-cinnamic acid) were prepared by metathesis in water and by direct reaction of the metal with cinnamic acid in a 1,2,4,5-tetramethylbenzene flux at ca. 200 °C. X-ray crystal structure determinations and X-ray powder data show that, in the solid state, the larger lanthanoids (La–Dy) form an isomorphous polymeric series consisting of homoleptic nine-coordinate metal centres bonded to three chelating and bridging tridentate cinnamates. The late REIII cinnamate (RE = Dy, Ho–Lu, Y) complexes also form linear one-dimensional polymeric chains with all RE metal atoms being seven-coordinate. The cinnamates are either bound tridentate bridging in a μ-η2:η1 fashion, or μ-η1:η1syn-syn bidentate bridging. A structural break occurs at dysprosium which has been characterised in both crystallographic forms, and gives solely the late RE form when precipitated at 80 °C. ScIII cinnamate was also isolated as an analytically pure precipitate which was, again, found to be anhydrous in nature. A structural change was identified by powder XRD between the late REIII cinnamates and ScIII cinnamate. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Wiley |
Relação |
http://dro.deakin.edu.au/eserv/DU:30063861/hilder-synthesisandstructure-2007.pdf http://dx.doi.org/10.1002/zaac.200700359 |
Palavras-Chave | #cinnamates #rare earth elements #crystal structures |
Tipo |
Journal Article |