Lanthanide(II) Complexes Supported by N,O-Donor Tripodal Ligands: Synthesis, Structure, and Ligand-Dependent Redox Behavior

Chemistry : a European Journal
Julie AndrezMarinella Mazzanti

Abstract

The preparation and characterization of a series of complexes of the Yb and Eu cations in the oxidation state II and III with the tetradentate N,O-donor tripodal ligands (tris(2-pyridylmethyl)amine (TPA), BPA(-) (HBPA=bis(2-pyridylmethyl)(2-hydroxybenzyl)amine), BPPA(-) (HBPPA=bis(2-pyridylmethyl)(3.5-di-tert-butyl-2-hydroxybenzyl)amine), and MPA(2-) (H2 MPA=(2-pyridylmethyl)bis(3.5-di-tert-butyl-2-hydroxybenzyl)amine) is reported. The X-ray crystal structures of the heteroleptic Ln(2+) complexes [Ln(TPA)I2 ] (Ln=Eu, Yb) and [Yb(BPA)I(CH3 CN)]2 , of the Ln(2+) homoleptic [Ln(TPA)2 ]I2 (Ln=Sm, Eu, Yb) and [Eu(BPA)2 ] complexes, and of the Ln(3+) [Eu(BPPA)2 ]OTf and [Yb(MPA)2 K(dme)2 ] (dme=dimethoxyethane) complexes have been determined. Cyclic voltammetry studies carried out on the bis-ligand complexes of Eu(3+) and Yb(3+) show that the metal center reduction occurs at significantly lower potentials for the BPA(-) ligand as compared with the TPA ligand. This suggests that the more electron-rich character of the BPA(-) ligand results in a higher reducing character of the lanthanide complexes of BPA(-) compared with those of TPA. The important differences in the stability and reactivity of the investigated complexes are probably ...Continue Reading

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Citations

Jan 29, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Leonor MariaKonstantin V Luzyanin
Apr 9, 2019·Chemistry : a European Journal·Davide TonioloMarinella Mazzanti
Sep 24, 2020·Chemistry : a European Journal·Moya A Hay, Colette Boskovic
Feb 13, 2021·Inorganic Chemistry Frontiers·Ding WangGrégory Nocton
Dec 16, 2020·Inorganic Chemistry·Stuart A J BoyceCorinna R Hess
Jul 7, 2020·Journal of the American Chemical Society·Daniel KovacsK Eszter Borbas
Feb 23, 2019·Inorganic Chemistry·Frankie D WhiteThomas E Albrecht-Schmitt
Oct 26, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Molly M MacInnesPing Yang

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