%0 Journal Article %1 WOS:000570310100012 %A Gomes, E J %A Jr, J A Lima %A Freire, P T C %A Pinheiro, G S %A de Sousa, F F %A Remedios, C M R %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND %D 2020 %I PERGAMON-ELSEVIER SCIENCE LTD %J SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY %K L-asparagine; Phase Raman Thermal X-ray analyzes; diffraction; metals; spectroscopy; transitions} {Transition %R 10.1016/j.saa.2020.118643 %T Effect of Fe (III) on L-asparagine monohydrate investigated under low-and high-temperature conditions %V 241 %X Raman spectra of Fe doped L-asparagine monohydrate (LAM:Fe) crystal were studied under several temperatures varying from 17 to 490 K. The effect of Fe (III) ion on the stability of the crystal in changing temperature through the vibrational spectra was discussed. The behavior of inter and intra-molecular vibration modes has indicated two phase transitions and an amorphous transformation. These effects were also clarified by X-ray powder diffraction measurements which corroborate very well the Raman data. In addition, we have determinated the lattice parameters of all phases and verified that under low temperature conditions the crystal undergoes a conformational transition whereas under high temperatures its structure transforms from the orthorhombic (P2(1)2(1)2(1)-space group) to the monoclinic (P2(1)-space group) symmetry and, after this process, it goes to an amorphous phase due to the start of the decomposition. Finally, differential scanning calorimetry analysis was utilized as complementary technique to investigate the structural stability of LAM:Fe and results are in a good agreement with the Raman and the X-ray diffraction data. (C) 2020 Elsevier B.V. All rights reserved.

@article{WOS:000570310100012, abstract = {Raman spectra of Fe doped L-asparagine monohydrate (LAM:Fe) crystal were studied under several temperatures varying from 17 to 490 K. The effect of Fe (III) ion on the stability of the crystal in changing temperature through the vibrational spectra was discussed. The behavior of inter and intra-molecular vibration modes has indicated two phase transitions and an amorphous transformation. These effects were also clarified by X-ray powder diffraction measurements which corroborate very well the Raman data. In addition, we have determinated the lattice parameters of all phases and verified that under low temperature conditions the crystal undergoes a conformational transition whereas under high temperatures its structure transforms from the orthorhombic (P2(1)2(1)2(1)-space group) to the monoclinic (P2(1)-space group) symmetry and, after this process, it goes to an amorphous phase due to the start of the decomposition. Finally, differential scanning calorimetry analysis was utilized as complementary technique to investigate the structural stability of LAM:Fe and results are in a good agreement with the Raman and the X-ray diffraction data. (C) 2020 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, author = {Gomes, E J and Jr, J A Lima and Freire, P T C and Pinheiro, G S and de Sousa, F F and Remedios, C M R}, biburl = {https://www.bibsonomy.org/bibtex/203bdb8d4c3bc97ec5ebcd5d97c5fe588/ppgfis_ufc_br}, doi = {10.1016/j.saa.2020.118643}, interhash = {bdd6207d12a65ad5f7d8726d17bf8f0e}, intrahash = {03bdb8d4c3bc97ec5ebcd5d97c5fe588}, issn = {1386-1425}, journal = {SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY}, keywords = {L-asparagine; Phase Raman Thermal X-ray analyzes; diffraction; metals; spectroscopy; transitions} {Transition}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Effect of Fe (III) on L-asparagine monohydrate investigated under low-and high-temperature conditions}, tppubtype = {article}, volume = 241, year = 2020 }