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Dhibi M, Khdhiri E, Ayedi MA, Abid S, Ammar H. Microwave-assisted synthesis and reactivity of new 5-amino-1H-pyrazole derivatives bearing 2-furoyl moieties. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2095213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Manel Dhibi
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Emna Khdhiri
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Mohamed Ali Ayedi
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Souhir Abid
- Chemistry Department, College of Science and Arts, Jouf University, Jouf, Saudi Arabia
| | - Houcine Ammar
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
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Jumaah M, Khairuddean M, Owaid SJ. Benzothiazole Pyrazoline: Acid-Switchable Absorption and Fluorescence of Photoinduced Electron Transfer (PET). J Fluoresc 2022; 32:937-948. [PMID: 35119575 DOI: 10.1007/s10895-021-02782-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/13/2021] [Indexed: 10/19/2022]
Abstract
Acid-responsive fluorescent compounds were prepared by introducing an ortho-hydroxyphenyl to pyrazoline with a benzothiazole backbone. These compounds demonstrated normal fluorescence photoinduced electron transfer (PET) under neutral conditions but the addition of trifluoroacetic acid showed an arctic blue fluorescence, we verified that a protonation process of nitrogen in the thiazole ring which weakened the ability of thiazole to donate electrons to the pyrazoline and changed the photoinduced electron transfer led to photoinduced electron transfer (PET), which was the mechanism of the fluorescence quenching phenomenon under strongly acidic conditions. The photophysical properties of Benzothiazole pyrazoline exhibited blue emission at 421 nm in aqueous DMSO. The blue shift in the emission was switched by acid in DMSO, showing the compound's distinct fluorescence peak at 554 nm. To investigate solvatochromism, eight different solvents were used. The red-shift emission observed in enhancing the polarity of solvents and emission in DMSO suggested the conformation of the molecule which led to the intramolecular charge transfer by color and emission changes. Furthermore, the probe was also applied using the High-performance liquid chromatography (HPLC) with a UV detector to determine the trifluoroacetic acid in water samples. Interestingly, the method was found to be linear over the range of 10.0 µg L-1 to 250.0 µg L-1 (0.999). Under the optimum condition, the separation of trifluoroacetic acid was achieved in 20 min with the LOD of 1.3 µg L-1 and LOQ of 5.1 µg L-1. This proposed method also showed satisfactory results when applied for the analysis of trifluoroacetic acid in a water sample.
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Affiliation(s)
- Maadh Jumaah
- Department of Chemistry, School of Chemical Sciences, University Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Melati Khairuddean
- Department of Chemistry, School of Chemical Sciences, University Sains Malaysia, 11800, Minden, Penang, Malaysia.
| | - Sohaib Jumaah Owaid
- Department of Chemistry, School of Chemical Sciences, University Sains Malaysia, 11800, Minden, Penang, Malaysia
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Swarbrook AM, Weekes RJ, Goodwin JW, Hawes CS. Ligand isomerism fine-tunes structure and stability in zinc complexes of fused pyrazolopyridines. Dalton Trans 2021; 51:1056-1069. [PMID: 34935828 DOI: 10.1039/d1dt04007c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fused-ring pyrazoles offer a versatile platform for derivitization to give finely tuned and functional ligands in coordination assemblies. Here, we explore the pyrazolo[4,3-b]pyridine (HL1) and pyrazolo[3,4-c]pyridine (HL2) backbones and their N-substituted derivatives, using their coordination chemistry with zinc(II) in the solid state and in solution to examine the steric and electronic effects of varying their substitution pattern. The parent heterocycles HL1 and HL2 both generate robust and permanently porous isomeric MOFs on reaction with zinc and a dicarboxylate co-ligand. The subtle geometric change offered by the position of the backbone pyridyl nitrogen atom leads to substantial changes in the pore size and total pore volume, which is reflected in both their surface areas and CO2 uptake performance. Both materials are also unusually resilient to atmospheric water vapour by virtue of the strong metal-azolate bonding. The isomeric chelating ligands L3-L6, generated by N-arylation of the parent heterocycles with a 2-pyridyl group, each coordinate to zinc to give either mononuclear or polymeric coordination compounds depending on the involvement of the backbone pyridine nitrogen atom. While crystal packing influences based on the steric preferences of the ligands are dominant in the crystalline phase, fluorescence spectroscopy is used to show that the 2H isomers L4 and L6 show distinct coordination behaviour to the 1H isomers L3 and L5, forming competing [ML] and [ML2] species in soution. The first stability constant for L6 with zinc(II) is an order of magnitude larger than for the other three ligands, suggesting an improved binding strength based on the electron configuration in this isomer. These results show that careful control of remote substitution on fused pyrazole ligands can lead to substantial improvements in the stability of the resulting complexes, with consequences for the design of stable coordination assemblies containining labile metal ions.
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Affiliation(s)
- Amelia M Swarbrook
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Rohan J Weekes
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Jack W Goodwin
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Chris S Hawes
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
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Golovanov AA, Odin IS, Gusev DM, Vologzhanina AV, Sosnin IM, Grabovskiy SA. Reactivity of Cross-Conjugated Enynones in Cyclocondensations with Hydrazines: Synthesis of Pyrazoles and Pyrazolines. J Org Chem 2021; 86:7229-7241. [PMID: 33955756 DOI: 10.1021/acs.joc.1c00569] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The cyclocondensation of cross-conjugated enynones, dienynones, and trienynones (easily available due to low-cost starting compounds) with arylhydrazines leads to the regioselective synthesis of pyrazole derivatives (dihetaryl-substituted ethens, buta-1,3-diens, and hexa-1,3,5-triens) or results in 4,5-dihydro-1H-pyrazoles in good yield. The reaction path is controlled by the character of the substituent in enynone: the pyrazoles are obtained from the reaction of substrates that contain five-membered heteroaromatic substituents with arylhydrazines, and the 4,5-dihydro-1H-pyrazoles are obtained from the reaction of 1,5-diphenylpent-1-en-4-yn-3-one with arylhydrazines consistently. Despite the presence of a substituent, cyclocondensation of 2-hydrazinylpyridine with all of examined cross-conjugated enynones leads to the formation of pyrazoles. The reaction does not require special conditions (temperature, catalyst, inert atmosphere). The cyclocondensation pathways are determined by the electronic effect of an electron-rich five-membered heteroaromatic ring in the substrate. The synthesis allows use of various substituents and functional groups in enynone and hydrazine. The present method features high yields and simplicity of the product purification. The obtained pyrazoles possess fluorescent properties with a quantum yield up to 31%.
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Affiliation(s)
| | - Ivan S Odin
- Togliatti State University, 14 Belorusskaya Str., 445020 Togliatti, Russia
| | - Dmitry M Gusev
- Togliatti State University, 14 Belorusskaya Str., 445020 Togliatti, Russia
| | - Anna V Vologzhanina
- A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Science, 28 Vavilova Str., 119991 Moscow, Russia
| | - Ilya M Sosnin
- Togliatti State University, 14 Belorusskaya Str., 445020 Togliatti, Russia
| | - Stanislav A Grabovskiy
- Ufa Institute of Chemistry, UFRS of the Russian Academy of Science, 71 October Av., 450054 Ufa, Russia
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Yuan D, Cai N, Xu J, Miao D, Zhang S, Woodfine SE, Plana D, Hawes CS, Watkinson M. A Series of Manganese(III) Salen Complexes as a Result of Team-Based Inquiry in a Transnational Education Programme. Chempluschem 2020; 85:1210-1219. [PMID: 32515150 DOI: 10.1002/cplu.202000337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/12/2020] [Indexed: 11/10/2022]
Abstract
The development of a team-based approach to research-led transnational practical chemistry teaching is described in which a team of five Chinese students on an articulated transnational degree programme, supported by a team of academic and technical staff, carried out a study examining the structural chemistry of a series of manganese(III) salen complexes. A series of four crystallographically characterized manganese(III) salen complexes with ancillary carboxylate ligands are reported here. The carboxylate coordination modes range from the bridging syn-anti μ2 -κO : κO' mode observed in the predominant cyclohexanoate and isobutyrate species, to a capping terminal monodentate mode for the adamantanoate species, and an unusual mixture of bridging and terminal coordination modes observed in a second minor phase of the cyclohexanoate species. The variation on extended structures based on the weakly interacting aliphatic backbones may provide a useful basis for further structural studies.
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Affiliation(s)
- Danlei Yuan
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom.,Nanjing Xiaozhuang University, Nanjing Shi, Jiangsu Sheng, P. R. China
| | - Ningqi Cai
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom.,Nanjing Xiaozhuang University, Nanjing Shi, Jiangsu Sheng, P. R. China
| | - Jingxi Xu
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom.,Nanjing Xiaozhuang University, Nanjing Shi, Jiangsu Sheng, P. R. China
| | - Danyang Miao
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom.,Nanjing Xiaozhuang University, Nanjing Shi, Jiangsu Sheng, P. R. China
| | - Sheng Zhang
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom.,Nanjing Xiaozhuang University, Nanjing Shi, Jiangsu Sheng, P. R. China
| | - Sian E Woodfine
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom
| | - Daniela Plana
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom
| | - Chris S Hawes
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom
| | - Michael Watkinson
- The Lennard Jones Laboratories, School of Chemical and Physical Sciences, Keele University, Keele, ST5 5BG, United Kingdom
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Tigreros A, Portilla J. Recent progress in chemosensors based on pyrazole derivatives. RSC Adv 2020; 10:19693-19712. [PMID: 35515469 PMCID: PMC9054117 DOI: 10.1039/d0ra02394a] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 05/19/2020] [Indexed: 12/16/2022] Open
Abstract
Colorimetric and fluorescent probes based on small organic molecules have become important tools in modern biology because they provide dynamic information concerning the localization and quantity of the molecules and ions of interest without the need for genetic engineering of the sample. In the past five years, these probes for ions and molecules have attracted great attention because of their biological, environmental and industrial significance combined with the simplicity and high sensitivity of absorption and fluorescence techniques. Moreover, pyrazole derivatives display a number of remarkable photophysical properties and wide synthetic versatility superior to those of other broadly used scaffolds. This review provides an overview of the recent (2016-2020) findings on chemosensors containing pyrazole derivatives (pyrazoles, pyrazolines and fused pyrazoles). The discussion focuses on the design and physicochemical properties of chemosensors in order to realize their full potential for practical applications in environmental and biological monitoring (sensing of metal ions, anions, explosives, and biomolecules). We also present our conclusions and outlook for the future.
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Affiliation(s)
- Alexis Tigreros
- Department of Chemistry, Bioorganic Compounds Research Group, Universidad de los Andes Carrera 1 No. 18A-10 Bogotá 111711 Colombia
| | - Jaime Portilla
- Department of Chemistry, Bioorganic Compounds Research Group, Universidad de los Andes Carrera 1 No. 18A-10 Bogotá 111711 Colombia
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