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Rodrigues JAO, Oliveira Neto JG, Santos CC, Nogueira CES, de Sousa FF, de Menezes AS, Dos Santos AO. Phase changes of tris(glycinato)chromium(III) monohydrate crystal systematically studied by thermal analyses, XRPD, FTIR, and Raman combined with ab initio calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 271:120883. [PMID: 35042044 DOI: 10.1016/j.saa.2022.120883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 01/04/2022] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
Tris(glycinato)chromium(III) monohydrate [Cr(C2H4NO2)3·H2O] crystals were grown through the slow solvent evaporation method. The crystals were studied by Fourier transform infrared (FTIR) and Raman spectroscopy at room temperature. The assignments of vibration modes were performed using the Density Functional Theory (DFT). Thermal analyses (TGA, DTA, and DSC), X-ray diffraction (XRD), and Raman were used to study the phase changes on the crystals under high- and low-temperature conditions. Temperature-dependent XRPD measurements were carried out in the interval of 473-12 K. Several changes were observed in the patterns, like the appearance of new peaks and the disappearance of peaks occurring within 373-393 K due to water loss. In addition, the Raman measurements were performed in the 423-10 K interval. Several changes on the inter and intramolecular vibration bands during the cooling, such as decreasing bands' intensities, the appearance of vibration modes, and discontinuities on the modes' behavior, were observed. These spectral modifications occurred at about 370 K and within 120-220 K, thus, confirming that the crystals undergo two phase changes, one being structural and the other one conformational, respectively, at high- temperature and low-temperature conditions. Finally, thermal investigations corroborated the structural and vibrational results under high temperatures.
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Affiliation(s)
- J A O Rodrigues
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-410, Brazil
| | - J G Oliveira Neto
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-410, Brazil
| | - C C Santos
- Departamento de Física, Universidade Federal do Maranhão, CCET, São Luís, MA 65080-805, Brazil
| | - C E S Nogueira
- Universidade Regional da Cariri, Crato, CE 63010-970, Brazil
| | - F F de Sousa
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-410, Brazil; Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil.
| | - A S de Menezes
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-410, Brazil; Departamento de Física, Universidade Federal do Maranhão, CCET, São Luís, MA 65080-805, Brazil
| | - A O Dos Santos
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, CCSST, Imperatriz, MA 65900-410, Brazil
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Synthesis, spectroscopic characterization, and theoretical studies on the substitution reaction of chromium(III) picolinate. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Uddin KM, Poirier RA, Henry DJ. Investigation of mono-, bis- and tris-glycinatochromium(III): Comparisons of computational and experimental results. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.04.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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