The effect of CuII ions in L-asparagine single crystals

Santana, Ricardo Costa de; Gontijo, Henrique de Oliveira; Menezes, Arthur F.; Martins, José A.; Carvalho, Jesiel Freitas

The effect of CuII ions in L-asparagine single crystals

Data

2016

Autores

Santana, Ricardo Costa de

Gontijo, Henrique de Oliveira

Menezes, Arthur F.

Martins, José A.

Carvalho, Jesiel Freitas

Resumo

We report the synthesis, crystal growth, and spectroscopic characterization of L-asparagine monohydrate (LAM) single crystals doped with CuII. The crystals were successfully grown by slow cooling from a supersaturated aqueous solution up to size of 16 12 2 mm3 ;the effect of copper impurities in the crystals morphology was discussed. Electron Paramagnetic Resonance (EPR) was used to calculate the g and hyperfine coupling (A) tensors of the CuII ions (g1¼2.044, g2¼2.105, g3¼2.383and A1E0, A2¼35, A3¼108 Gauss). The EPR spectra for certain orientations of the magnetic field suggest that CuII ions are coordinated to two 14N atoms. Correlating the EPR and optical absorption results, the crystal field and the CuII orbital bond parameters were calculated. The results indicate thaWe report the synthesis, crystal growth, and spectroscopic characterization of L-asparagine monohydrate (LAM) single crystals doped with CuII. The crystals were successfully grown by slow cooling from a supersaturated aqueous solution up to size of 16 12 2 mm3 ;the effect of copper impurities in the crystals morphology was discussed. Electron Paramagnetic Resonance (EPR) was used to calculate the g and hyperfine coupling (A) tensors of the CuII ions (g1¼2.044, g2¼2.105, g3¼2.383and A1E0, A2¼35, A3¼108 Gauss). The EPR spectra for certain orientations of the magnetic field suggest that CuII ions are coordinated to two 14N atoms. Correlating the EPR and optical absorption results, the crystal field and the CuII orbital bond parameters were calculated. The results indicate that the paramagnetic center occupies interstitial rhombic distorted site and the ground orbital state for the unpaired electron is the d(x2 -y2 ).t the paramagnetic center occupies interstitial rhombic distorted site and the ground orbital state for the unpaired electron is the d(x2 -y2 ).

Palavras-chave

Organic compound, Crystal growth, Electron Paramagnetic Resonance (EPR), Crystal field

Citação

SANTANA, Ricardo C. et al. The effect of CuII ions in l-asparagine single crystals. Physica B: condensed matter, Amsterdam, v. 501, p. 84-89, 2016. DOI: 10.1016/j.physb.2016.08.007. Disponível em: https://www.sciencedirect.com/science/article/pii/S0921452616303428. Acesso em: 18 jan. 2024.