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Separation of Divalent Transition Metal Beta-Diketonates and Their Adducts by Supercritical Fluid Chromatography

Separation of Divalent Transition Metal Beta-Diketonates and Their Adducts by Supercritical Fluid Chromatography

Y Lin, H Wu, C M Wai, N G Smart

Talanta. 2000 Jul 31;52(4):695-701.

PMID: 18968028

Abstract:

A method for separation and detection of divalent transition metal beta-diketonates by adduct formation/supercritical fluid chromatography (SFC) with an open-tubular capillary column and a FID detector is described. The crystal structures of copper (Cu)-hexafluoro-acetylacetone (HFA) and Cu bis(2,2,6,6-tetramethyl-3,5-heptanedionato) (THD) complexes have been determined by X-ray crystallography. The SFC behavior of Cu beta-diketonates shows a strong correlation with the structure of the complexes. The hydrated cu beta-diketonate complexes usually exhibit strong intermolecular interactions or decomposition in SFC. Formation of adducts with a neutral donor, such as tributyl phosphine oxide (TBPO), can greatly improve the SFC behavior and detection sensitivity of Cu(II) and Mn(II) beta-diketonates. The stoichiometry and thermal stability of the adducts Cu(II) and Mn(II) beta-diketonates with TBPO in supercritical CO(2) have also been investigated. The implications of utilizing adduct formation for supercritical fluid extraction (SFE) of divalent transition metals and for on-line coupled SFE/SFC analysis of divalent transition metals are discussed.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP814299	Tributyl phosphine oxide		814-29-9	Price

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