1
|
Surface processes in selective photocatalytic oxidation of hydroxybenzyl alcohols by TiO2 P25. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
2
|
Briz-López EM, Navarro R, Martínez-Hernández H, Téllez-Jurado L, Marcos-Fernández Á. Design and Synthesis of Bio-Inspired Polyurethane Films with High Performance. Polymers (Basel) 2020; 12:E2727. [PMID: 33213051 PMCID: PMC7698539 DOI: 10.3390/polym12112727] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/11/2020] [Accepted: 11/16/2020] [Indexed: 01/03/2023] Open
Abstract
In the present work, the synthesis of segmented polyurethanes functionalized with catechol moieties within the hard or the soft segment is presented. For this purpose, a synthetic route of a new catechol diol was designed. The direct insertion of this catechol-free derivative into the rigid phase led to segmented polyurethanes with low performance (σmax ≈ 4.5 MPa). Nevertheless, when the derivative was formally located within the soft segment, the mechanical properties of the corresponding functionalized polyurethane improved considerably (σmax ≈ 16.3 MPa), owing to a significant increase in the degree of polymerization. It is proposed that this difference in reactivity could probably be attributed to a hampering effect of this catecholic ring during the polyaddition reaction. To corroborate this hypothesis, a protection of the aromatic ring was carried out, blocking the hampering effect and avoiding secondary reactions. The polyurethane bearing the protected catechol showed the highest molecular weight and the highest stress at break described to date (σmax ≈ 66.1 MPa) for these kind of catechol-functionalized polyurethanes. Therefore, this new approach allows for the obtention of high-performance polyurethane films and can be applied in different sectors, benefiting from the molecular adhesion introduced by the catechol ring.
Collapse
Affiliation(s)
- Eva Marina Briz-López
- Instituto Politécnico Nacional-ESIQIE, Dpto. Ing. En Metalurgia y Materiales, UPALM-Zacatenco, 07738 Mexico City, Mexico; (E.M.B.-L.); (H.M.-H.); (L.T.-J.)
| | - Rodrigo Navarro
- Institute of Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain;
- Interdisciplinary Platform for “Sustainable Plastics towards a Circular Economy” (SUSPLAST-CSIC), 28006 Madrid, Spain
| | - Héctor Martínez-Hernández
- Instituto Politécnico Nacional-ESIQIE, Dpto. Ing. En Metalurgia y Materiales, UPALM-Zacatenco, 07738 Mexico City, Mexico; (E.M.B.-L.); (H.M.-H.); (L.T.-J.)
| | - Lucía Téllez-Jurado
- Instituto Politécnico Nacional-ESIQIE, Dpto. Ing. En Metalurgia y Materiales, UPALM-Zacatenco, 07738 Mexico City, Mexico; (E.M.B.-L.); (H.M.-H.); (L.T.-J.)
| | - Ángel Marcos-Fernández
- Institute of Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain;
- Interdisciplinary Platform for “Sustainable Plastics towards a Circular Economy” (SUSPLAST-CSIC), 28006 Madrid, Spain
| |
Collapse
|
3
|
Wu X, Wang Y, Xue J, Liu J, Qin J, Hong Z, Du Y. Solid phase drug-drug pharmaceutical co-crystal formed between pyrazinamide and diflunisal: Structural characterization based on terahertz/Raman spectroscopy combining with DFT calculation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 234:118265. [PMID: 32203686 DOI: 10.1016/j.saa.2020.118265] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 03/09/2020] [Accepted: 03/15/2020] [Indexed: 06/10/2023]
Abstract
Both pretty low solubility and high membrane permeability of diflunisal (DIF) would affect significantly its oral bioavailability as a typical non-steroidal anti-inflammatory substance. Meanwhile, pyrazinamide (PZA), known as one kind of important anti-tuberculosis drugs, has also several certain side effects. These deficiencies affect the large-scale clinical use of such drugs. Solid-state pharmaceutical co-crystallization is of contemporary interest since it offers an easy and efficient way to produce prospective materials with tunable improved properties. In the current work, a novel solid phase drug-drug co-crystal involving DIF and PZA with molar ratio 1:1 was prepared through the mechanical grinding approach, and vibrational spectroscopic techniques including terahertz time-domain spectroscopy (THz-TDS) and Raman spectroscopy were performed to identify DIF, PZA and their pharmaceutical drug-drug co-crystal. The absorption peaks observed in the THz spectra of the co-crystal were at 0.35, 0.65, 1.17, 1.31 and 1.42 THz respectively, which are obviously different from parent materials. Similarly, Raman spectra could also be used to characterize the difference shown between the co-crystal and parent compounds. Structures and vibrational patterns of three kinds of possible co-crystal theoretical forms (form I, II and III) between DIF and PZA have been simulated by performing density functional theory (DFT) calculations. Theoretical results and THz/Raman vibrational spectra of DIF-PZA co-crystal show that the DIF links to PZA via the carboxylic acid-pyridine hetero-synthon association establishing the theoretical form I, which is a much-higher degree of agreement with experimental results than those of other two co-crystal forms. These results provide us a unique method for characterizing the composition of co-crystal structures, and also provide a wealth of drug-drug co-crystal structural information for improving physicochemical properties and pharmacological activities of specific drugs at the molecular-level.
Collapse
Affiliation(s)
- Xiushan Wu
- School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, PR China; College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, PR China
| | - Yaguo Wang
- Centre for THz Research, China Jiliang University, Hangzhou City, Zhejiang Province 310018, PR China
| | - Jiadan Xue
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou City, Zhejiang Province 310018, PR China
| | - Jianjun Liu
- Centre for THz Research, China Jiliang University, Hangzhou City, Zhejiang Province 310018, PR China
| | - Jianyuan Qin
- Centre for THz Research, China Jiliang University, Hangzhou City, Zhejiang Province 310018, PR China
| | - Zhi Hong
- Centre for THz Research, China Jiliang University, Hangzhou City, Zhejiang Province 310018, PR China
| | - Yong Du
- Centre for THz Research, China Jiliang University, Hangzhou City, Zhejiang Province 310018, PR China.
| |
Collapse
|
4
|
Wang Y, Xue J, Qin J, Liu J, Du Y. Structure and spectroscopic characterization of pharmaceutical co-crystal formation between acetazolamide and 4-hydroxybenzoic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 219:419-426. [PMID: 31063956 DOI: 10.1016/j.saa.2019.04.082] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 04/23/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
Co-crystals have great potential for drug research and development because the formation of co-crystal is accompanied by changes inter-molecular interactions between starting materials that enable to improve both physical and chemical properties of active pharmaceutical ingredients. In order to provide a more profound insight into the structural changes of specific drugs upon co-crystallization, spectroscopic characterization of solid-state acetazolamide (ACZ), 4-hydroxybenzoic acid (4HBA) and their co-crystal prepared by mechanical grinding approach has been performed with spectral techniques including terahertz time-domain spectroscopy (THz-TDS) and Raman spectroscopy. Experimental THz spectra show that the ACZ-4HBA co-crystal has a few significantly different absorption peaks in 0.82, 1.16, 1.28 and 1.64 THz respectively compared with parent materials in the frequency region from 0.2 to 1.8 THz. Likewise, such differences between the co-crystal and starting compounds could also be characterized by Raman vibrational spectra. Moreover, density functional theory (DFT) calculations were performed to simulate optimized structures and vibrational modes of three kind of possible co-crystal theoretical forms (form I, II and III) between ACZ and 4HBA. Theoretical results and THz/Raman vibrational spectra of ACZ-4HBA co-crystal show that the 4HBA links to the thiadiazole acetamide fragment of ACZ via the double-bridged heterodimeric synthon C(N)NH⋯HOOC inter-molecular hydrogen bonding interaction establishing the theoretical form I, which is more consistent with experimental observations than other two possible theoretical co-crystal forms. These results provide rich information and unique method for characterizing the composition of co-crystal structures and also inter-molecular interactions shown within pharmaceutical co-crystallization process at the molecular level.
Collapse
Affiliation(s)
- Yaguo Wang
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Jiadan Xue
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Jianyuan Qin
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Jianjun Liu
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Yong Du
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China.
| |
Collapse
|
5
|
Wang Y, Xue J, Wang Q, Jin S, Zhang Z, Hong Z, Du Y. Structural investigation of a 2:1 co-crystal between diflunisal and isonicotinamide based on terahertz and Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 216:98-104. [PMID: 30884353 DOI: 10.1016/j.saa.2019.03.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 01/18/2019] [Accepted: 03/10/2019] [Indexed: 06/09/2023]
Abstract
In order to characterize molecular structure changes of drugs upon co-crystallization by means of spectroscopic techniques, vibrational spectra of solid-state diflunisal (DIF), isonicotinamide (ISO) and their 2:1 co-crystal have been investigated by using terahertz time-domain spectroscopy (THz-TDS) and Raman spectroscopy. A 2:1 DIF-ISO co-crystal between DIF and ISO has been synthesized by slow solution crystallization from ethanol. The experimental THz spectroscopy shows that the co-crystal has a few significantly different absorption peaks compared with raw parent materials within the frequency region from 0.2 to 1.6 THz. Likewise, some differences of vibrational spectra between the co-crystal and starting compounds could also be characterized by Raman spectral results. Density functional theory (DFT) was used to simulate optimized structures and vibrational modes of two kind of possible co-crystal theoretical forms (form I and II) between DIF and ISO. Theoretical co-crystal form I is shown with 2:1 theoretical binary-adduct formed by carboxylic acid-amide and carboxylic acid-pyridine under inter-molecular hydrogen bonding. Theoretical co-crystal form II has a similar structure as form I, meanwhile the only difference is that O63 atom simultaneously forms hydrogen bond with H33 and H64. Also the hydroxyl -OH and carboxyl group -COOH establish molecular heterocycle under intra-molecular hydrogen bonds in both forms. The theoretical results show that both THz and Raman spectra of co-crystal form II between DIF and ISO is more consistent with the experimental observations than those of co-crystal form I. These results provide us with a wealth of information and unique method for characterizing the composition of co-crystal structures and also inter-molecular hydrogen bonding interactions shown within pharmaceutical co-crystallization at the molecular level.
Collapse
Affiliation(s)
- Yaguo Wang
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Jiadan Xue
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Qiqi Wang
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Shunji Jin
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Ziming Zhang
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Zhi Hong
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China
| | - Yong Du
- Centre for THz Research, China Jiliang University, Hangzhou 310018, China.
| |
Collapse
|
6
|
Mino L. IR spectroscopy as a tool to investigate photocatalytic reactions at oxide surfaces. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2016. [DOI: 10.1007/s12210-016-0592-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|