Tendency of the Nephelauxetic Effect to Vary in a Series of Lanthanide Complexes with Allyl Acetoacetate

Mishchenko, Artem; Trunova, Elena; Berezhnytskaya, A. S.; Rogovtsov, A. A.

doi:10.1007/s10812-015-0027-x

Cited by 5 publications

(2 citation statements)

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“…A recent study established that the nephelauxetic parameter increased regularly with increasing Z in series of allyl acetoacetate lanthanide complexes. 55 This trend is consistent with the increasing effects observed here when replacing Am III by Cm III . The experimental formation constants of the complexes formed with ligand 1 increased in the 4f series with decreasing metal ionic radius and also increased from Am III to Cm III .…”

Section: Nephelauxetic Effect and Bonding Strengthsupporting

confidence: 90%

“…A recent study established that the nephelauxetic parameter increased regularly with increasing Z in series of allyl acetoacetate lanthanide complexes. 55 This trend is a Elements in parentheses are those connected to the oxygen atom. consistent with the increasing effects observed here when replacing Am III by Cm III .…”

Section: Nephelauxetic Effect and Bonding Strengthmentioning

confidence: 94%

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Intramolecular sensitization of americium luminescence in solution: shining light on short-lived forbidden 5f transitions

et al. 2016

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The photophysical properties and solution thermodynamics of water soluble trivalent americium (Am(III)) complexes formed with multidentate chromophore-bearing ligands, 3,4,3-LI(1,2-HOPO), Enterobactin, and 5-LIO(Me-3,2-HOPO), were investigated. The three chelators were shown to act as antenna chromophores for Am(III), generating sensitized luminescence emission from the metal upon complexation, with very short lifetimes ranging from 33 to 42 ns and low luminescence quantum yields (10(-3) to 10(-2)%), characteristic of Near Infra-Red emitters in similar systems. The specific emission peak of Am(III) assigned to the (5)D1 → (7)F1 f-f transition was exploited to characterize the high proton-independent stability of the complex formed with the most efficient sensitizer 3,4,3-LI(1,2-HOPO), with a log β110 = 20.4 ± 0.2 value. In addition, the optical and solution thermodynamic features of these Am(III) complexes, combined with density functional theory calculations, were used to probe the influence of electronic structure on coordination properties across the f-element series and to gain insight into ligand field effects.

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Section: Nephelauxetic Effect and Bonding Strengthsupporting

confidence: 90%

Section: Nephelauxetic Effect and Bonding Strengthmentioning

confidence: 94%