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Pinho EKS, Silva Filho JGD, Sousa FF, Freire PTC, Lima JA, Dos Santos AO, Filho PFF. Phase transitions of L-histidinium hydrogen oxalate crystal under high pressures investigated by Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 298:122800. [PMID: 37156174 DOI: 10.1016/j.saa.2023.122800] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/27/2023] [Accepted: 04/26/2023] [Indexed: 05/10/2023]
Abstract
L-histidinium hydrogen oxalate (L-HisH)(HC2O4) crystal is formed from amino acid. L-histidine with oxalic acid whose vibrational high pressures behavior have not yet been investigated in the literature. Here we synthesized (L-HisH)(HC2O4) crystal by slow solvent evaporation method in a 1:1 ratio of L-histidine and oxalic acid. In addition, a vibrational study of (L-HisH)(HC2O4) crystal as a function of pressure was performed via Raman spectroscopy in the pressure range of 0.0-7.3 GPa. From analysis of the behavior of the bands within 1.5-2.8 GPa, characterized by the disappearance of lattice modes, the occurrence of a conformational phase transition was noted. A second phase transition, now from structural type, close to 5.1 GPa was observed due to the incidence of considerable changes in lattice and internal modes, mainly in vibrational modes related to imidazole ring motions.
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Affiliation(s)
- E K S Pinho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - J G da Silva Filho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - F F Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP, 66075-110 Belém, PA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP, 60455-970 Fortaleza, CE, Braazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, CEP, 60455-970 Fortaleza, CE, Braazil
| | - A O Dos Santos
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil
| | - P F F Filho
- Centro de Ciências de Imperatriz, Universidade Federal do Maranhão, CEP, 65900-410 Imperatriz, MA, Brazil.
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Strel'nik AD, Garipov MR, Petukhov AS, Shtyrlin NV, Lodochnikova OA, Litvinov IA, Naumov AK, Morozov OA, Klimovitskii AE, Shtyrlin YG. Structural and spectral characterization of novel non-centrosymmetric 2,4-dintrobenzene derivative. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 117:793-797. [PMID: 24344352 DOI: 10.1016/j.saa.2013.09.092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel organic compound 9-(2,4-dinitrophenyloxy)-3,3,8-trimethyl-1,5-dihydro-[1,3]dioxepino[5,6-c]pyridine (DNPAP) has been synthesized and a nonlinear optical (NLO) crystal has been grown by slow evaporation method. Compound was subjected to different characterization analyses in order to find out its suitability for optoelectronic applications. Single crystal and powder X-ray diffraction analyses show that DNPAP crystallizes in the orthorhombic space group Pca21. The range of optical absorption was ascertained by recording UV–Vis spectrum. The second harmonic generation (SHG) test has shown that DNPAP possesses 6.4-times higher NLO efficiency compared to KDP.
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