AI Article Synopsis
Article Abstract
End-off bicompartmental ligands bearing a nitronyl-nitroxide arm have been designed for synthesizing various heterospin molecular systems. These ligands can selectively interact with 3d and 4f metal ions, leading to 2p-4f, 2p-3d, and 2p-3d-4f complexes. The magnetic properties of the 2p-4f and 2p-3d-4f complexes have been investigated and rationalized by theoretical calculations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c7cc03236f | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Magnetic relaxation in unique nitronyl nitroxide biradical-Ln-Cu chains with Ln-bis(NIT)-Cu-bis(NIT)-Ln units.
Dalton Trans
May 2023
Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
Utilizing a nitronyl nitroxide biradical NITPhPybis [5-(4-pyridyl)-1,3-bis(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1-imidazol-2-yl)-benzene], a new family of isomorphic 2p-3d-4f chains {[LnCu(hfac)(NITPhPybis)]·CHCl} (hfac: hexafluoroacetylacetonate; Ln: Gd 1; Dy 2; Ho 3; Tb 4) have been successfully produced. In complexes 1-4, the NITPhPybis biradical chelates one Ln ion through its bis(NIT) moiety while the N donor of pyridine and another uncoordinated NO group of the biradical, respectively, bind one Cu ion, yielding a biradical-Ln-Cu 1D zigzag chain with a unique [Ln-bis(NIT)-Cu-bis(NIT)-Ln] structural motif. DC magnetic studies reveal that ferromagnetic exchanges dominate in these Cu-Ln-biradical chains, originating from the ferromagnetic Ln-NO and NO-Cu exchanges.
View Article and Find Full Text PDFCyclic [Cu-biRadical] Secondary Building Unit in 2p-3d and 2p-3d-4f Complexes: Crystal Structure and Magnetic Properties.
Molecules
March 2023
Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS), Université de Toulouse, Centre National de la Recherche Scientifique (CNRS), 31077 Toulouse, France.
Employing the new nitronyl nitroxide biradical ligand biNIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-bis(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide)), a 16-spin Cu-radical complex, [Cu(biNIT-3Py-5-Ph)(hfac)] , and three 2p-3d-4f chain complexes, {[Ln(hfac)][Cu(hfac)](biNIT-3Py-5-Ph)} (Ln= Gd , Tb , Dy ; hfac = hexafluoroacetylacetonate), have been prepared and characterized. X-ray crystallographic analysis revealed in all derivatives a common cyclic [Cu-biNIT] secondary building unit in which two bi-NIT-3Py-5-Ph biradical ligands and two Cu ions are associated via the pyridine N atoms and NO units. For complex , two such units assemble with four additional Cu ions to form a discrete complex involving 16 = 1/2 spin centers.
View Article and Find Full Text PDFEnhancing the Magnetization Blocking Energy of Biradical-Metal System by Merging Discrete Complexes into One-Dimensional Chains.
Chemistry
March 2023
Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS), Université de Toulouse, CNRS, 31077, Toulouse, France.
The reaction of nitronyl nitroxide biradical NITPhMeImbis [5-(2-methylimidazole)-1,3-bis(1-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)-benzene] with Ln(hfac) ⋅ 2H O and Cu(hfac) (hfac=hexafluoroacetylacetonate), led to two series of 2p-3d-4f complexes, namely, nona-spin clusters, [Ln Cu (hfac) (NITPhMeImbis) ] (Ln=Gd 1, Dy 2), or one-dimensional chains [LnCu (hfac) (NITPhMeImbis)] (Ln=Y 3, Dy 4, Tb 5) depending on the temperature of the reaction. All five complexes contain a biradical-Ln unit in which the biradical chelates the Ln ion by the means of one aminoxyl (i. e.
View Article and Find Full Text PDFInvestigation by Chemical Substitution within 2p-3d-4f Clusters of the Cobalt(II) Role in the Magnetic Behavior of [vdCoLn] (vd = Verdazyl Radical).
Inorg Chem
October 2022
Laboratoire National des Champs Magnétiques Intenses (LNCMI) Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS F-38042 Grenoble, France.
1,5-Dimethyl-3-(3'-(hydroxymethyl)-2'-pyridine)-6-oxotetrazane (HvdpyCHOH) or its oxidized verdazyl form (vdpyCHOH) reacted with transition metal and/or lanthanide acetates to yield [(vdpyCHO)CoLn(acO)] (Ln = Y(III): ; Gd(III): ), [(vdpyCHO)M(acO)] (M = Zn(II): ; Co(II): ) and [(vdpyCHOH)Zn(acO)] () through self-assembly implying a complex--ligand intermediate. Single-crystal diffraction reveals that are composed of 2p-3d-4f centrosymmetric clusters with verdazyl radicals at the two ends coordinated to the transition-metal ion in a tridentate mode and to the {Ln(acO)} lanthanide central core in a monodentate mode through its alkoxo moiety. In , the transition-metal ions adopt an irregular octahedral environment, and the {Ln(acO)} core adopts a paddlewheel motif, whereas in , the transition metal is pentacoordinated, and the central core contains only two acetate bridges.
View Article and Find Full Text PDFHetero-tri-spin systems: an alternative stairway to the single molecule magnet heaven?
Dalton Trans
November 2021
Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Rosie nr. 23, 020464 Bucharest, Romania.
The search for molecule-based magnetic materials has stimulated over the years the development of extremely rich coordination chemistry. Various combinations of spin carriers have been investigated and illustrated by a plethora of hetero-spin complexes: 3d-nd, 3d-4f, 2p-3d, and 2p-4f. More recently, two other classes of hetero-spin complexes have grown rapidly: compounds containing three different paramagnetic metal ions, or one radical and two different paramagnetic metal ions (all within the same molecular entity).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!