Isostructural Oxamate Complexes with Visible Luminescence (Eu³⁺) and Field-Induced Single-Molecule Magnet (Nd³⁺)

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Diogo, Emilay B. T. ; da Silva, Eufranio N. ; Oliveira, Willian X. C. ; Stumpf, Humberto O. ; Fabris, Fernando ; de Almeida, Adriele A. ; Knobel, Marcelo ; Ferreira, Fabio F. ; Nunes, Wallace C. ; Pedroso, Emerson F. ; Julve, Miguel ; Pereira, Cynthia L. M.

• Document type: Journal article
• Source: CHEMISTRY-AN ASIAN JOURNAL; v. N/A, p. 13-pg., 2024-10-31.

Abstract

The search for new metal-organic compounds as candidates for quantum information processing technologies is in the spotlight. Several metal ions and organic linkers have been used to obtain such compounds. Herein, we describe the synthesis, crystal structures, and cryomagnetic properties of two air-stable isostructural neodymium(III) and europium(III) one-dimensional (1D) coordination polymers of formula [Nd(Hmpa)3(DMSO)2]n (1) and [Eu(Hmpa)3(DMSO)2]n (2) [Hmpa=N-(4-methylphenyl)oxamate, and DMSO=dimethylsulfoxide]. These complexes were prepared by reacting n-Bu4N(Hmpa) proligand [n-Bu4N+=tetra-n-butylammonium] and the correspondent LnCl3 & sdot; 6H2O salt (Ln=Nd or Eu) in the open air and mild conditions. The crystal structures of 1 and 2 reveal the Ln3+ ion surrounded by two DMSO molecules and three oxamate ligands, one of them connecting to adjacent mononuclear entities through carboxylate bridges featuring a homometallic chain, while the other two establishing double N-H & sdot; & sdot; & sdot; O hydrogen bonds among adjacent polymers to give a resultant supramolecular 2D network. Cryomagnetic measurements in the static (dc) and dynamic current (ac) regimes reveal that 1 behaves as a field-induced single-molecule magnet below 8.8 K. A photoluminescence study shows that Hmpa ligands efficiently sensitize the luminescence of Eu3+ complex in the visible region in the solid state at room temperature. (AU)

• FAPESP's process: 21/13592-0 - Magnetoliposomes for remote controlled drug release, activated through the application of an alternating magnetic field
• Grantee: Adriele Aparecida de Almeida
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 23/09820-2 - Materials by design: from quantum materials to energy applications
• Grantee: Gustavo Martini Dalpian
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Special Projects