Agradecimentos: Authors thank the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, grants 309874/2021-1, 407993/2022-3, 306827/2023-9), the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES, Finance code 001), the Bioanalytical Facility NEPS-DQ/UFMG (https://ne.qui.ufmg.br), the LAREMAR and LabCri facilities from UFMG, the Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (APQ-03705-23), the Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP, with grants 2023/09820-2, 2017/10581-1, 2019/13678-1 and 2021/13592-0), the Fundo de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ, E-26/010.000978/2019 and E-26/010.1553/2019), the Spanish MINECO (Project PID201935-GBI00) and Unidad de Excelencia Maria de Maeztu CEX2019-000919 for financial support. The authors thank Prof. Dr. Luiz A. Cury from the Departamento de Fisica, Universidade Federal de Minas Gerais, for photoluminescence measurements Ver menos

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 LnCl(3)center dot 6H(2)O salt (Ln=Nd or Eu) in the open air and mild conditions. The crystal structures of 1 and 2 reveal the Ln(3+) 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 center dot center dot center dot 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 Ver menos