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Rodrigues FS, da Silva VAM, Segovia GBQ, Bortoluzzi AJ, Cuin A, de Souza JIR, da Silva JAB, Lourenço da Luz L, Alves Júnior S, Tonon de Almeida E, Camargo MA. Synthesis, solid state characterization, theoretical and experimental spectroscopic studies of the new lanthanide complexes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 296:122677. [PMID: 37030253 DOI: 10.1016/j.saa.2023.122677] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 03/15/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
Three new complexes Na[Ln(pic)4]ּ⋅2.5H2O (Ln = Tb, Eu or Gd; pic = picolinate) were synthesized and characterized by infrared spectroscopy, powder X-ray diffraction and thermogravimetric analyses. The molecular structures of the complexes have been determined by single-crystal X-ray diffraction. The three isostructural lanthanide complexes crystalize in the hexagonal system with space group P6122 to Eu complex and Gd complex and space group P6522 to Tb complex. In each of the complexes, the picolinate ligands are bonded to Ln3+ and Na+ ions by different coordination modes promoting polymeric structures. The photoluminescent properties of complexes were studied and combined with theoretical studies using the density functional theory (DFT: B3LYP, PBE1PBE) and the semiempirical method AM1/Sparkle from the single crystal X-ray diffraction structures to assign a suitable model for describing the system. The B3LYP DFT functional was considered the most adequate for providing structural properties of the compounds and for describing luminescence properties. The excited triplet states (T1) and excited singlet states (S1) of the ligand were determined theoretically using Time-dependent DFT calculations (TD-DFT: B3LYP, CAM-B3LYP and LC-wPBE) and INDO/S-CIS, with the best agreement with experimental values obtained from the LC-wPBE DFT functional. The photoluminescent spectra of the complexes and their lifetime measurements were determined indicating that the Eu complex and Tb complex display different intramolecular energy transfer mechanisms with higher efficiency to ligand-to-terbium energy transfer. In addition, the experimental and theorical Judd-Ofelt intensity parameters and quantum yields of the complexes were also determined and discussed besides to a proposed 9-state diagram to describe the luminescence properties of the Eu complex. The low value of emission quantum efficiency of 5D0 emitting level of Eu(III) ion was explained by the presence of the ligand-to-metal charge transfer state (LMCT) evidenced experimentally and theoretically. A good agreement was obtained between the proposed kinetic model and experimental results showing the consistency of the set of rate equations assumed and the intramolecular pathways proposed.
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Affiliation(s)
- Fernanda Sodré Rodrigues
- Laboratório de Síntese Inorgânica e Bioinorgânica, Instituto de Química, Universidade de Brasília, Brasília, DF, Brazil
| | | | | | - Adailton João Bortoluzzi
- Laboratório de Bioinorgânica e Cristalografia (LABINC), Departamento de Química, Universidade de Santa Catarina, Florianópolis, SC, Brazil
| | - Alexandre Cuin
- Laboratório de Quimica Bioinorgânica, Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
| | - Jéssica I R de Souza
- Programa de Pós-Graduação em Ciência de Materiais, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Juliana A B da Silva
- Núcleo Interdisciplinar de Ciências Exatas e da Natureza, Campus do Agreste, Universidade Federal de Pernambuco, Caruaru, PE, Brazil; Programa de Pós-Graduação em Química, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
| | - Leonis Lourenço da Luz
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Severino Alves Júnior
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | | | - Maryene Alves Camargo
- Laboratório de Síntese Inorgânica e Bioinorgânica, Instituto de Química, Universidade de Brasília, Brasília, DF, Brazil.
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Thakur P, Conca JL, Choppin GR. Complexation studies of Cm(III), Am(III), and Eu(III) with linear and cyclic carboxylates and polyaminocarboxylates. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.616927] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Punam Thakur
- a Department of Chemistry and Biochemistry , Florida State University , Tallahassee , FL 32306-4390 , USA
- c Carlsbad Environmental Monitoring and Research Center, 1400 University Drive , Carlsbad , NM 88220 , USA
| | - James L. Conca
- b MSA Analytical Services, RJ Lee Group, Inc. , Richland , WA 99352 , USA
| | - Gregory R. Choppin
- a Department of Chemistry and Biochemistry , Florida State University , Tallahassee , FL 32306-4390 , USA
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Tyrrell É, Nesterenko PN, Paull B. Flow Analysis Method Using Chelating CIM Monolithic Disks for Monitoring Dissolved Labile Copper in Environmental Water Samples. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070600832897] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Éadaoin Tyrrell
- a National Centre for Sensor Research, School of Chemical Sciences , Dublin City University , Dublin, Ireland
| | - Pavel N. Nesterenko
- a National Centre for Sensor Research, School of Chemical Sciences , Dublin City University , Dublin, Ireland
| | - Brett Paull
- a National Centre for Sensor Research, School of Chemical Sciences , Dublin City University , Dublin, Ireland
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Soares-Santos PC, Nogueira HI, Félix V, Drew MG, Ferreira RA, Carlos LD, Trindade T. Synthesis and crystal structure of [nBu4N][Er(pic)4]·5.5H2O: a new infrared emitter. INORG CHEM COMMUN 2003. [DOI: 10.1016/s1387-7003(03)00239-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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