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Avelar S Silva J, Militão Vasconcelos DL, Araújo de Lima R, Cordeiro AJP, Tarso C Freire P. Structural and vibrational analysis of glycyl-L-phenylalanine and phase transition under high-pressure. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 304:123383. [PMID: 37725884 DOI: 10.1016/j.saa.2023.123383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 09/03/2023] [Accepted: 09/08/2023] [Indexed: 09/21/2023]
Abstract
The structural and vibrational properties of the glycyl-L-phenylalanine dipeptide were investigated using vibrational spectroscopy (Raman and infrared) and first-principle calculations. Raman spectroscopy measurements were performed between 100 and 3200 cm-1 and infrared spectroscopy from 100 and 3200 cm-1 under ambient conditions. The conformational analysis of the zwitterionic form of the dipeptide was performed using the B3LYP functional, the 6-311++ base set and the Polarizable Continuum Model of solvation, determining the lowest energy conformation and assigning the vibrational modes. The effect of pressure on the glycyl-1-phenylalanine crystal was investigated using the Raman spectroscopy between 0.0 and -7.1 GPa in the spectral region of 100 - 3200 cm-1. As a result, conformational changes around 1.0 GPa were observed in the lattice modes and in some internal modes, showing a reorganization of the molecule in the crystal. In the decompression process, it was observed that the conformational change is reversible and the original Raman spectrum is recoverd.
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Affiliation(s)
- José Avelar S Silva
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, 60021-970, Fortaleza, CE, Brazil.
| | - Daniel L Militão Vasconcelos
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, 60021-970, Fortaleza, CE, Brazil; Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - Raphaela Araújo de Lima
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, 60021-970, Fortaleza, CE, Brazil
| | - Adrya J P Cordeiro
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, 60021-970, Fortaleza, CE, Brazil
| | - Paulo Tarso C Freire
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, 60021-970, Fortaleza, CE, Brazil.
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Peng Q, Li L, Hui W, Hu A, Wang X, Wang H, Xia Y. Effects of different ligand modifications on catalytic transfer hydrogenation of Lewis acid catalysts: Quantum chemical studies on the case of ZrCl2-Sal(ph)en. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Modeling of the spatial and electronic structure and the dipole moment of titanocene dicarboranyl. Russ Chem Bull 2020. [DOI: 10.1007/s11172-020-2749-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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