Publication

Characterization and photophysical properties of lanthanide macrocyclic complexes derived from (2,1)

Jean-Claude Bünzli
1999
Journal Articles

Abstract

The isolation and characterization of Ln(NO3)3 complexes (Ln=La, Pr, Nd, Eu, Tb, Lu) with 2,3-benzo-1,4,7,13-tetraoxa-10-azacyclo-penta-decane (L1) and two of its N-substituted derivatives (L2, L3) are reported. Structural information in the solid state is derived from spectroscopic data (vibrational, absorption, reflectance and luminescence spectra). Both ligand- and metal-centered luminescence of solutions of the complexes in oxygen-free and anhydrous acetonitrile are investigated. Substitution of the N–proton of the crown ether enhances metal emission. Ligand L2 displays a good antenna effect for EuIII luminescence, while L3 is especially effective in transferring energy from its triplet state onto the excited states of TbIII. The EuIII site in Eu(NO3)3L2·0.5C2H5OH·1.5H2O possesses a low local symmetry and a relatively long 5D0 lifetime (1.01 ms).

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https://infoscience.epfl.ch/entities/publication/92ae1e24-48a4-43a3-9718-21989fd1825d

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Jean-Claude Bünzli
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/92ae1e24-48a4-43a3-9718-21989fd1825d

About this result

Related concepts (32)

Lanthanide

The lanthanide (ˈlænθənaɪd) or lanthanoid (ˈlænθənɔɪd) series of chemical elements comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare-earth elements or rare-earth metals. The informal chemical symbol Ln is used in general discussions of lanthanide chemistry to refer to any lanthanide.

Metal–organic framework

Metal–organic frameworks (MOFs) are a class of compounds consisting of metal clusters (also known as SBUs) coordinated to organic ligands to form one-, two-, or three-dimensional structures. The organic ligands included are sometimes referred to as "struts" or "linkers", one example being 1,4-benzenedicarboxylic acid (BDC). More formally, a metal–organic framework is an organic-inorganic porous extended structure. An extended structure is a structure whose sub-units occur in a constant ratio and are arranged in a repeating pattern.

Triplet state

In quantum mechanics, a triplet state, or spin triplet, is the quantum state of an object such as an electron, atom, or molecule, having a quantum spin S = 1. It has three allowed values of the spin's projection along a given axis mS = −1, 0, or +1, giving the name "triplet". Spin, in the context of quantum mechanics, is not a mechanical rotation but a more abstract concept that characterizes a particle's intrinsic angular momentum. It is particularly important for systems at atomic length scales, such as individual atoms, protons, or electrons.

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Characterization and photophysical properties of lanthanide macrocyclic complexes derived from (2,1)

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