Reactions in water between a lanthanide ion and 3,4,5,6-tetrachloro-phthalate lead to a new series of iso-structural coordination polymers with general chemical formula [Ln(tcpa)(HO)] with Ln = Eu-Yb plus Y. The crystal structure has been solved on the Y-derivative. This compound crystallizes in the monoclinic system, space group 2/ (no.
View Article and Find Full Text PDFIn this study, we investigate the thermodynamics of lanthanide-based coordination polymer molecular alloys. We demonstrate that if lanthanide ions have many chemical similarities, the solubility of homo-lanthanide-based coordination polymers can vary significantly from one lanthanide ion to another. Indeed, we experimentally determine the solubility constants of a series of isostructural homo-lanthanide coordination polymers, with general chemical formula [Ln(bdc)(HO)] with Ln = La-Er plus Y and where bdc symbolizes 1,4-benzene-di-carboxylate.
View Article and Find Full Text PDFIn this study we demonstrate that single-chain magnets (SCMs) can be assembled in gel phase and transferred intact on surface. We take advantage of a family of SCMs based on Tb ions and nitronyl-nitroxides radicals functionalized with short alkyl chains known to form crystalline supramolecular nanotubes interacting with heptane acting as crystallizing solvent. When the radicals are functionalized with long aliphatic chains a robust gel is formed with similar structural and functional properties respect to its crystalline parent.
View Article and Find Full Text PDFMeasuring the luminance of lanthanide-based coordination polymers under UV excitation is of prime importance for many technological applications. This study highlights that the quantum yield gives no information about the luminescence intensity of a solid-state compound. Indeed, compounds with high quantum yield can actually be poorly luminescent.
View Article and Find Full Text PDFReactions in water at ambient temperature and pressure between a lanthanide ion and benzene-1,3,5-tricarboxylate (or trimesate) lead to two series of iso-structural coordination polymers. Their general chemical formula is [Ln(tma)(HO)] for the lightest lanthanide ions (Ln = La-Dy except ), while it is [Ln(tma)(HO)·3.5HO] for the heaviest ones (Ho-Lu plus Y).
View Article and Find Full Text PDFMicrowave-assisted reactions in DMSO, between a hexa-lanthanide octahedral complex ([Ln(μ-O)(μ-OH)(NO)(HO)·2NO·2HO] with Ln = Nd-Yb plus Y) and either 3-halogenobenzoic acid (hereafter symbolized by 3-bH with = f or c for fluoro or chloro, respectively) or 4-halogenobenzoic acid (hereafter symbolized by 4-bH with = f, c, or b for fluoro, chloro, or bromo, respectively), lead to 1D lanthanide coordination polymers. These coordination polymers are almost iso-reticular. The crystal structure is described on the basis of the coordination polymer with chemical formula [Tb(4-fb)(DMSO)(HO)·DMSO] obtained from 4-fluorobenzoic acid (4-fbH) and the Tb-based octahedral complex: It crystallizes in the triclinic system, space group 1̅ (n°2), with the following cell parameters: = 9.
View Article and Find Full Text PDFSolvothermal reactions between hexanuclear complexes with the general chemical formula [Ln(μ-O)(μ-OH)(NO)(HO)]·2NO·2HO and 2-bromobenzoic acid (2-bbH) lead to a series of isostructural one-dimensional coordination polymers with the general chemical formula [Ln(2-bb)] with Ln = Sm, Eu, Tb, Dy, and Y. These coordination polymers crystallize in the orthorhombic space group 2 (No. 43) with the following cell parameters: = 29.
View Article and Find Full Text PDFThe careful monitoring of crystallization conditions of a mixture made of a Tb building block and a substituted nitronyl-nitroxide that typically provides infinite coordination polymers (), affords a remarkably stable linear hexanuclear molecule made of six Tb ions and five NIT radicals. The are double-bridged by water molecules but calculations demonstrate that this bridge is inefficient in mediating any magnetic interaction other than a small dipolar antiferromagnetic coupling. Surprisingly the , despite being finite molecules, show a single-chain magnet (SCM) behavior.
View Article and Find Full Text PDFIsostructural lanthanide-based coordination polymers with general chemical formula [Ln(phen)(glu)(NO)] with Ln = La-Tm (except Ce and Pm) have been synthesized by hydrothermal methods (Hglu stands for glutaric acid and phen stands for 1,10-phenantroline). They crystallize in the monoclinic system with the 2/ (no. 14) space group.
View Article and Find Full Text PDFConspectusLanthanide ions are prime ingredients for the design of compounds, materials, and devices with unique magnetic and optical properties. Accordingly, coordination chemistry is one of the best tools for building molecular edifices from these ions because it allows careful control of the ions' environment and of the dimensionality of the final compound.In this Account, we review our results on lanthanide-based dimers.
View Article and Find Full Text PDFReactions in water of lanthanide chlorides with the sodium salt of 4,5-dichlorophthalate (dcpa) lead to two families of isostructural coordination polymers: family that gathers compounds with the general chemical formula [Ln(dcpa)(HO)] with Ln = La-Gd (except Pm) and family that gathers compounds with general chemical formula [Ln(dcpa)(HO)·3HO] with Ln = Tb-Lu plus Y. Heterolanthanide molecular alloys that contain both Eu and Tb ions have been prepared in both structural families. Their luminescence properties have been studied, especially from the brightness point of view.
View Article and Find Full Text PDFA series of isostructural homo- and heterolanthanide coordination polymers of formula [Ln(dcpa)(HO)] with Ln = La-Gd have been obtained by reactions in water between the lightest lanthanide chlorides and the disodium salt of 4,5-dichlorophthalic acid (Hdcpa). They present particularly high thermal stability for coordination compounds (up to 400 °C). Their luminescent properties have been studied in detail.
View Article and Find Full Text PDFThe size, morphology, and purity control of coordination compound powders is a key stage for their conversion into materials and devices. In particular, surface science techniques require highly pure bulk materials with a narrow crystallite-size distribution together with straightforward, scalable, and reproducible crystallization procedures. In this work we demonstrate how sonocrystallization, i.
View Article and Find Full Text PDFBeilstein J Nanotechnol
December 2019
The terbium(III) ion is a particularly suitable candidate for the creation of surface-based magnetic and luminescent devices. In the present work, we report the epitaxial growth of needle-like objects composed of [Tb(hfac)·2HO] (where hfac = hexafluoroacetylacetonate) polymeric units on muscovite mica, which is observed by atomic force microscopy. The needle-like shape mimics the structure observed in the crystalline bulk material.
View Article and Find Full Text PDFReactions in solvothermal or microwave-assisted conditions between a hexanuclear rare-earth entity ([Ln] with Ln = Eu-Dy) and -halogeno-benzoic acids lead to three series of isostructural complexes with respective chemical formulas [Ln(μ-OH)(HO)(NO)(3-cb)]·4CHCN, [Ln(μ-OH)(HO)(NO)(3-bb)]·6CHCN, and [Ln(μ-OH)(HO)(NO)(3-ib)]·6CHCN, where 3-cb, 3-bb, and 3-ib represent 3-chloro-, 3-bromo-, and 3-iodo-benzoate, respectively. These three series of compounds are almost isostructural. Their luminescent properties, in the solid and solution states, have been studied in detail and compared.
View Article and Find Full Text PDFWe report a single-chain magnet (SCM) made of a terbium(III) building block and a nitronyl-nitroxide radical (NIT) functionalized with an aliphatic chain. This substitution is targeted to induce a long-range distortion of the polymeric chain and accordingly it gives rise to chains that are curled with almost 20 nm helical pitch. They self-organize as a chiral tubular superstructure made of 11 chains wound around each other.
View Article and Find Full Text PDFWe report the synthesis, ab initio calculations, magnetic and optical characterization of a Dy-based dimeric compound named DyAZO. The dimers self-organize into a supramolecular chain decorated with photo-isomerizable azobenzene ligands. DyAZO displays single-molecule magnet (SMM) behavior.
View Article and Find Full Text PDFActa Crystallogr E Crystallogr Commun
March 2019
Reaction in gel between the sodium salt of 1,4-phenyl-enedi-acetic acid (NaCOH-Na -pda) and lanthanum chloride yields single crystals of the three-dimensional coordination polymer poly[[tetra-aqua-tris-(μ-1,4-phenyl-enedi-acetato)-dilanthanum(III)] octa-hydrate], {[La(CHO)(HO)]·8HO}. The La coordination polyhedron can be described as a slightly distorted monocapped square anti-prism. One of the two -pda ligands is bound to four La ions and the other to two La ions.
View Article and Find Full Text PDFIsostructural lanthanide-based coordination polymers that are obtained by reactions in water of a lanthanide chloride and the sodium salt of 5-methoxyisophthalate (mip) have the general chemical formula [Ln(mip)(HO)·4HO] with Ln = Nd-Er except Pm plus Y (symbolized by [Ln(mip)]). Some of these homo-lanthanide compounds present very high luminescence brightness. The weak intermetallic energy transfer between lanthanide ions observed in these compounds allows the design of hetero-lanthanide coordination polymers with tunable luminescence properties.
View Article and Find Full Text PDFMicrocrystalline core-shell powders of lanthanide-based coordination polymers with general chemical formula ([Ln(cpbOH)])@([Ln'(cpbOH)]) with Hcpb = 1,4-carboxyphenylboronic acid have been synthesized and structurally characterized. Their luminescent properties have been studied. They are drastically different from those of heterolanthanide coordination polymers, also called "molecular alloys", that present the same crystal structure and chemical composition.
View Article and Find Full Text PDFReactions in water of lanthanide chlorides with the sodium salt of 1,4-carboxyphenylboronic acid lead to two series of isostructural compounds with respective general chemical formulas [Ln(cpb)(HO)] for Ln = La or Ce and [Ln(cpbOH)(HO)·(cpb)] for Ln = Pr-Lu (except Pm) plus Y. Heterolanthanide coordination polymers that are isostructural to the second series have been synthesized, and their photophysical properties have been studied. This study evidences that it is possible to design multiemissive lanthanide-based coordination polymers that could find their application as multigauge luminescent thermometric probes.
View Article and Find Full Text PDFThe rational design of molecular chains made of 4f ions and substituted 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical is presented. The reaction of Ln(hfac)·2HO (hfac = hexafluoroacetylacetonate) and the 4-cyano-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO-CN) radical affords air- and moisture-stable isostructural molecular chains of the formula [Ln(hfac)TEMPO-CN] for Ln = Gd and Tb, whereas zero-dimensional complexes of the formula [Dy(hfac)(TEMPO-CN)][Dy(hfac)(HO)] are obtained for Ln = Dy. To the best of our knowledge, the Gd derivative, Gd-TEMPO-CN, shows one of the strongest antiferromagnetic (AF) couplings for Gd-radical pairs ever reported with J/ k = -21.
View Article and Find Full Text PDFReactions in water of 4,5-dichlorophthalate (dcpa) with the heaviest lanthanide ions lead to a family of compounds with the general chemical formula [Ln(dcpa)(HO)·3HO], where Ln = Tb-Lu, Y. The synthesis, crystal structure, thermal behavior, and luminescent properties of this series of homonuclear compounds are described. Additionally, this family can be extended to isostructural heteronuclear compounds that can contain some light lanthanide ions and therefore present some original photophysical properties.
View Article and Find Full Text PDFWe report the study of a Dy-based metal-organic framework (MOF) with unprecedented magnetic properties. The compound is made of nine-coordinated Dy magnetic building blocks (MBBs) with poor intrinsic single-molecule magnet behavior. However, the MOF architecture constrains the MBBs in a one-dimensional structure that induces a ferromagnetic coupling between them.
View Article and Find Full Text PDFReaction of hexanuclear octahedral molecular precursors with a 3-chlorobenzoate ligand affords an unprecedented family of isostructural polylanthanide complexes via solvothermal and microwave-assisted syntheses in an acetonitrile medium. The general chemical formula of the compounds that constitute this series is {[Ln(μ-OH)(HO)(NO)(3-cb)]·(CHCN)}, where 3-cb stands for 3-chlorobenzoate and Ln = Eu, Tb, Dy, Ho, Er, or Y. The crystal structure, solubility, and magnetic and luminescent properties of these complexes have been studied.
View Article and Find Full Text PDF