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Structural and spectroscopic analysis of the Cis-Trans isomers of the captopril in the gaseous and aqueous phases. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Vasconcelos DLM, de Sousa FF, da Silva Filho JG, Teixeira AMR, Façanha Filho PF, Ribeiro PRS, Freire PTC. Raman spectroscopy of captopril crystals under low-temperature conditions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 243:118734. [PMID: 32810777 DOI: 10.1016/j.saa.2020.118734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 05/22/2020] [Accepted: 07/04/2020] [Indexed: 06/11/2023]
Abstract
The polymorphism is a characteristic of several active principles, and can affect the bioavailability of a drug. Among the drugs used in the treatment of heart diseases, captopril is one of the most widely used in the world. Despite the knowledge of vibrational properties of captopril under high temperature and under high pressure, a lack of information impedes the understanding of the substance in the crystal form at low temperatures. In this research, we investigated the vibrational properties of captopril crystals under cryogenic conditions in the 300-8 K interval using Raman spectroscopy. By observing the behavior of the inter- and intra-molecular vibrations it was possible to infer that the captopril molecules suffered a rearranging into the unit cell due slight orientational changes mainly involving CH⋯O hydrogen bonds. The phenomenon occurs in a large temperature range. However, the observed changes do not suggest the occurrence of a structural phase transition and the Raman spectra indicate that the trans conformation is recorded down to the lowest temperature available in the experiments.
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Affiliation(s)
- D L M Vasconcelos
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, 63.010-970 Juazeiro do Norte, CE, Brazil
| | - P F Façanha Filho
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - P R S Ribeiro
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60455-760 Fortaleza, CE, Brazil
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