Thermodynamic metal-ligand stability constants of rare earths with N-p-chlorophenyl-m-substituted benzohydroxamic acids

Agrawal, Y. K.; Sinha, Navneet; Menon, Shobhana K.

doi:10.1007/bf02047913

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The Δlog K (Lu-La) has been measured to be about > 5 for CDTA and related compounds. [72] The Δlog K (Lu-Er) measured for LLn 3 (~1 log unit) displaying a ''clover-leaf'' structure is in the order of magnitude that those measured for hydroxamic acid derivatives, [73] thus in line with lack of pre-organization and lower denticity.…”

Section: Trimetallic Lanthanide Complexesmentioning

confidence: 86%

Metal‐Mediated Interactions in Homo‐ and Heterobimetallic Edifices with Lanthanides: A Study in Solution

et al. 2022

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We report here on the coordination properties of a series of lanthanide cations (Ln=La, Nd, Eu, Tb, Er) with a tripodal homoditopic ligand L, which is bearing three diamido‐dihydroxamate arms anchored on a tertiary amine. The complexes of L with lanthanides were studied in a MeOH/H2O (80/20 by weight) solvent and a marked size‐discriminating effect depending on the intramolecular interactions was observed in the tripodal dinuclear lanthanide edifice. Positive cooperative effects favour the formation of the bimetallic LLn2 complexes compared with the monometallic analogues for the heavier lanthanide cations (Eu, Tb, Er), while the lighter ones (La, Nd) show a decrease of cooperative interactions in the corresponding bimetallic species. Moreover, increased levels of heterobimetallic complexes are detected for Ln(III) pairs containing a lighter Ln(III) ion and a heavier one. In contrast with the adjunctive ligand exchange reported for LFe2 and CDTA, the corresponding substitution reaction for LLn2 occurs according to a disjunctive mechanism. Our work thus highlights the importance of the balance between the rigidity of a tripodal structure and the flexibility of the side arms to accommodate two trivalent cations in a supramolecular ensemble.

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Section: Trimetallic Lanthanide Complexesmentioning

confidence: 86%

Metal‐Mediated Interactions in Homo‐ and Heterobimetallic Edifices with Lanthanides: A Study in Solution

et al. 2022

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“…The most of reports deal with copper and iron complexes for their importance [9][10][11][12][13], a few treat with lanthanide ions [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of Europium Compounds with L- and DL-α-Alanine-Hydroxamic Acids

et al. 1996

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Two of europium complexes with L-and DL-α-alanine-hydroxamic acids were synthesized. To our knowledge tley are the frrst examples of X-ray and spectral data of lanthanide single crystals with hydroxamic acid derivatives. Both compounds consist of dlmers in their structures, formed by two OH bridging groups of amino-hydroxamic acid molecules. Besides, two metal ions are chelated by CO and OH groups, forming frve-membered rings. In the complex with L-ligand, differennt than in the DL-one, two additional perchloric acid molecules are included in crystal cavities and form hydrogen bondings witl nitrogen and oxygen atoms of the ligand. Absorption, emission and excitation spectra were measured and analyzed at room and low temperatures. Structural effect of ligand chirality was found and its spectroscopic conseqnences are reported. Tle effect of the dimeric structure on spectroscopic properties is discussed.

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Thermodynamic metal-ligand stability constants of rare earths with N-p-chlorophenyl-m-substituted benzohydroxamic acids

Cited by 2 publications

References 18 publications

Metal‐Mediated Interactions in Homo‐ and Heterobimetallic Edifices with Lanthanides: A Study in Solution

Metal‐Mediated Interactions in Homo‐ and Heterobimetallic Edifices with Lanthanides: A Study in Solution

Optical Properties of Europium Compounds with L- and DL-α-Alanine-Hydroxamic Acids

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