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Cardoso LMB, de Oliveira Neto JG, Saraiva GD, Leite FF, Ayala AP, Dos Santos AO, de Sousa FF. New polymorphic phase of arachidic acid crystal: structure, intermolecular interactions, low-temperature stability and Raman spectroscopy combined with DFT calculations. RSC Adv 2023; 13:34032-34044. [PMID: 38020030 PMCID: PMC10660439 DOI: 10.1039/d3ra05388a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 11/04/2023] [Indexed: 12/01/2023] Open
Abstract
Saturated monocarboxylic fatty acids with long carbon chains are organic compounds widely used in several applied fields, such as energy production, thermal energy storage, antibactericidal, antimicrobial, among others. In this research, a new polymorphic phase of arachidic acid (AA) crystal was synthesized and its structural and vibrational properties were studied by single-crystal X-ray diffraction (XRD) and polarized Raman scattering. The new structure of AA was solved at two different temperature conditions (100 and 300 K). XRD analysis indicated that this polymorph belongs to the monoclinic space group P21/c (C2h5), with four molecules per unit cell (Z = 4). All molecules in the crystal lattice adopt a gauche configuration, exhibiting a R22(8) hydrogen bond pattern. Consequently, this new polymorphic phase, labeled as B form, is a polytype belonging to the monoclinic symmetry, i.e., Bm form. Complementarily, Hirshfeld's surfaces were employed to analyze the intermolecular interactions within the crystal lattice of this polymorph at temperatures of 100 and 300 K. Additionally, density functional theory (DFT) calculations were performed to assign all intramolecular vibration modes related to experimental Raman-active bands, which were properly calculated using a dimer model, considering a pair of AA molecules in the gauche configuration, according to the solved-crystal structure.
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Affiliation(s)
- Luanny M B Cardoso
- Institute of Exact and Natural Sciences, Federal University of Para - UFPA Belém Pará CEP 66075-110 Brazil
| | - João G de Oliveira Neto
- Center for Social Sciences, Health, and Technology, Federal University of Maranhao - UFMA Imperatriz Maranhão CEP 65900-410 Brazil
| | - Gilberto D Saraiva
- Physics Course, State University of Ceara - UECE Campus FECLESC Quixadá Ceará CEP 63900-000 Brazil
| | - Fábio F Leite
- Department of Exact and Technological Sciences, Federal University of Amapá - UNIFAP Macapá Amapá CEP 68903-419 Brazil
| | - Alejandro P Ayala
- Department of Physics, Federal University of Ceara - UFC Fortaleza Ceará CEP 65455-900 Brazil
| | - Adenilson O Dos Santos
- Center for Social Sciences, Health, and Technology, Federal University of Maranhao - UFMA Imperatriz Maranhão CEP 65900-410 Brazil
| | - Francisco F de Sousa
- Institute of Exact and Natural Sciences, Federal University of Para - UFPA Belém Pará CEP 66075-110 Brazil
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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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Structural, thermal, electronic, vibrational, magnetic, and cytotoxic properties of chloro(glycinato-N,O)(1,10-phenanthroline-N,N')‑copper(II) trihydrate coordination complex. J Inorg Biochem 2021; 226:111658. [PMID: 34781206 DOI: 10.1016/j.jinorgbio.2021.111658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/03/2021] [Accepted: 11/03/2021] [Indexed: 01/23/2023]
Abstract
Chloro(glycinato-N,O)(1,10-phenanthroline-N,N')‑copper(II) trihydrate complex was synthesized through the slow evaporation method. The crystal's structural, thermal, magnetic, and vibrational properties were obtained by X-ray powder diffraction (XRPD), thermal analyses, magnetization, Raman, and Fourier-transform infrared (FT-IR) spectroscopy. XRPD results showed that the crystalline complex belongs to a monoclinic system (P21/n). Thermal analyses revealed that around 333 K, the material undergoes a thermodynamically irreversible process. Magnetic data showed a paramagnetic behavior with weak ferromagnetic interactions. Moreover, all the Raman- and infrared-active bands were assigned from computational calculations based on the density functional theory (DFT) to analyze intra-molecular vibrational modes. In addition, the cytotoxic assay on colorectal cancer cells was performed to evaluate the antitumor activity of this ternary compound. Therefore, the antineoplastic activity of [Cu(1,10-phenanthroline)(glycine)Cl]•3H2O complex in HCT-116 cells was confirmed, showing a potent cytotoxic effect.
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