Rapid and simultaneous relaxometric methods to study paramagnetic ion complexes in solution: An alternative to spectrophotometry

Autor(es)

Crizostomo Kock, Flavio Vinicius ^[1] ; Colnago, Luiz Alberto ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 122, p. 144-148, SEP 2015.
• Citações Web of Science: 11

Resumo

T-1 and T-2 relaxation times, measured with rapid and simultaneous continuous wave free precession (CWFP) and Carr-Purcell-continuous wave free precession (CP-CWFP) pulse sequences were used to study complexes of EDTA with paramagnetic ions in solution. The relaxation times of Cu(II)-EDTA and {[}CuEDTA(center dot)NH(3)](-2) complexes, from pH 1 to 13, measured in a 0.47 T time-domain nuclear magnetic resonance (TD-NMR) spectrometer show good agreement with the absorbance at approximately 730 nm. These methods were also used to study colorless complexes containing paramagnetic ions, not accessible by electronic spectroscopy, such as Mn(II)-EDTA. Therefore, these sequences can be used in any bench top TD-NMR spectrometers as faster alternative to spectrophotometry in analytical routine analyses. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/23169-8 - Estudo in situ da ação do biopolímero quitosana na descontaminação de metais e herbicidas em sistemas aquosos por eletroquímica acoplada com RMN de alto e baixo campo
• Beneficiário: Flavio Vinicius Crizostomo Kock
• Modalidade de apoio: Bolsas no Brasil - Doutorado