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Ticona Chambi J, Fandaruff C, Cuffini SL. Identification and quantification techniques of polymorphic forms - A review. J Pharm Biomed Anal 2024; 242:116038. [PMID: 38428367 DOI: 10.1016/j.jpba.2024.116038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 02/13/2024] [Accepted: 02/14/2024] [Indexed: 03/03/2024]
Abstract
In the pharmaceutical industry, the unexpected appearance of crystalline forms could impact the therapeutic efficacy of an Active Pharmaceutical Ingredient (API). For quality control, a thorough qualitative and quantitative monitoring of pharmaceutical solid forms is essential to ensure the detection and the quantification of crystalline forms, wither different or with the same chemical composition (polymorphs) at a low detection level. The purpose of this paper was to review and highlight the importance of choosing adequate solid-state techniques for detection and quantification APIs that present polymorphism - based on limits of detection (LOD) and quantification (LOQ), pharmacopeias specifications, international guidelines and studies reported in the literature. To this study, the powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), Infrared and Raman spectroscopies and solid-state nuclear magnetic resonance (NMR) were the solid-state techniques analyzed. Additionally, the Argentine, Brazilian, British, European, International, Japanese, Mexican and the United States of America pharmacopeias were reviewed. Based on the analysis performed, the advantages and disadvantages of these techniques, as well as the LOD and LOQ values of APIs were reported. In comparison to these solid-state techniques, reference material used for identification analyses should be previously identified with the corresponding polymorph. Without this previous procedure, the patterns, the spectra, and DSC curves of the reference material can only be used to confirm the mixture of solid forms, not being able to specify which polymorphs are contained in the sample. A major advantage of PXRD is the use of the calculated diffraction patterns obtained from the Crystallographic Information Frameworks (CIFs) files which could be used as a reference pattern without any other information, assistance technique, or physical standards. Regarding the quantification aspect, different pharmacopeias suggest various methods such as the PXRD combining with Rietveld method, which can be used to obtain lower LOD values for minority phases in the mixture of different substances without the need for a calibration curve. Raman spectroscopy can detect polymorphs in small particles and solid-state NMR spectroscopy is a powerful technique for quantification not only crystalline but also crystalline-amorphous mixtures. Finally, this review intends to be a useful tool to control, with efficiency and accuracy, the polymorphism of APIs in pharmaceutical compounds.
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Affiliation(s)
- Julian Ticona Chambi
- Pós-Graduação em Engenharia e Ciência de Materiais, Instituto de Ciência e Tecnologia (ICT), Universidade Federal de São Paulo (UNIFESP), São Paulo, Brasil
| | - Cinira Fandaruff
- Pós-Graduação em Engenharia e Ciência de Materiais, Instituto de Ciência e Tecnologia (ICT), Universidade Federal de São Paulo (UNIFESP), São Paulo, Brasil; Laboratório de Micro e Nanotecnologia, Instituto de Tecnologia em Fármacos /Farmanguinhos (FIOCRUZ), Rio de Janeiro, Brasil
| | - Silvia Lucia Cuffini
- Pós-Graduação em Engenharia e Ciência de Materiais, Instituto de Ciência e Tecnologia (ICT), Universidade Federal de São Paulo (UNIFESP), São Paulo, Brasil.
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Hulushe ST, Malan FP, Hosten EC, Lobb KA, Khanye SD, Watkins GM. Photo-and thermoresponsive N-salicylideneaniline derivatives: solid-state studies and structural aspects. NEW J CHEM 2022. [DOI: 10.1039/d1nj03056f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Eight photo-and/or thermoresponsive salicylideneanilines were obtained by mechanosynthesis under solvent-free conditions and stabilized by external stimuli for their isolations in solid-state. Switching properties of these materials were investigated by various analytical techniques and spectroscopic data.
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Affiliation(s)
- Siya T. Hulushe
- Department of Chemistry, Rhodes University, P. O. Box 94, Makhanda 6139, South Africa
| | - Frederick P. Malan
- Department of Chemistry, University of Pretoria, 02 Lynwood Road, Hatfield, Pretoria 0002, South Africa
| | - Eric C. Hosten
- Department of Chemistry, Nelson Mandela University, Summerstrand, P. O. Box 77000, Gqeberha 6031, South Africa
| | - Kevin A. Lobb
- Department of Chemistry, Rhodes University, P. O. Box 94, Makhanda 6139, South Africa
| | - Setshaba D. Khanye
- Faculty of Pharmacy, Rhodes University, P. O. Box 94, Makhanda 6139, South Africa
| | - Gareth M. Watkins
- Department of Chemistry, Rhodes University, P. O. Box 94, Makhanda 6139, South Africa
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3
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Kralj M, Lukin S, Miletić G, Halasz I. Using Desmotropes, Cocrystals, and Salts to Manipulate Reactivity in Mechanochemical Organic Reactions. J Org Chem 2021; 86:14160-14168. [PMID: 34493040 DOI: 10.1021/acs.joc.1c01817] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Performing reactions in the solid state offers the largely unexplored possibility of influencing reactivity by manipulating the solid form of the starting reactants. In this work, we explore the use of various solid forms of barbituric acid and its effect on reaction paths and kinetics in a Knoevenagel condensation reaction with vanillin. Modifications of barbituric acid included the use of its desmotrope, a cocrystal, and a salt as the starting reactant. Comparing these reactions with the reaction starting from the commercial keto tautomer of barbituric acid, we find that the reaction kinetics could be accelerated or decelerated, together with a change in the reaction mechanism. Exploring solid forms of reactants can be used as general methodology for manipulating mechanochemical reactivity, further highlighting the benefits of conducting reactions in the solid state, because many of the modifications of solids become unavailable upon dissolution.
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Affiliation(s)
- Magdalena Kralj
- Ruđer Bošković Institute, Bijenička c.54, 10000 Zagreb, Croatia
| | - Stipe Lukin
- Ruđer Bošković Institute, Bijenička c.54, 10000 Zagreb, Croatia
| | - Goran Miletić
- Ruđer Bošković Institute, Bijenička c.54, 10000 Zagreb, Croatia
| | - Ivan Halasz
- Ruđer Bošković Institute, Bijenička c.54, 10000 Zagreb, Croatia
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Shi Y, Xing J, Li J, Zhu F, Fan X, Zhang Y. The alcohol catalytic mechanism for Schiff base 1,3-proton transfer. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113419] [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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5
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Pereira NAM, Nunes CM, Reva I, Fausto R. Evidence of IR-Induced Chemistry in a Neat Solid: Tautomerization of Thiotropolone by Thermal, Electronic, and Vibrational Excitations. J Phys Chem A 2021; 125:6394-6403. [PMID: 34275275 DOI: 10.1021/acs.jpca.1c04081] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thiotropolone isolated in argon and xenon matrices (as monomers) or in a neat solid (as the crystalline or amorphous state) at low temperature was found to exist only in the thione-enol form. Visible light irradiation (λ ≥ 400 nm) leads to thione-enol → thiol-keto tautomerization in matrices and under neat solid conditions at 15 K. The assignment of the IR spectra of the two thiotropolone tautomers (thione-enol and thiol-keto) was carried out with the support of B3LYP/6-311+G(2d,p) computations. The thiol-keto form generated in situ in a neat solid was found to tautomerize back to the thione-enol upon annealing up to 100 K. Gaussian-4 (G4) computations estimate that such a tautomerization process has an energy barrier of ∼25 kJ mol-1, which is consistent with the observations. Moreover, it was found that narrowband IR irradiation of the thiol-keto form in a neat solid, at the frequency of its CH stretching overtones/combination modes, also induces tautomerization to the thione-enol form. Such a result constitutes an important demonstration of vibrationally induced chemistry under neat solid conditions.
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Affiliation(s)
- Nelson A M Pereira
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Cláudio M Nunes
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Igor Reva
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.,CIEPQPF, Department of Chemical Engineering, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Rui Fausto
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
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Tautomeric Equilibrium of an Asymmetric β-Diketone in Halogen-Bonded Cocrystals with Perfluorinated Iodobenzenes. CRYSTALS 2021. [DOI: 10.3390/cryst11060699] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In order to study the effect of halogen bond on tautomerism in β-diketones in the solid-state, we have prepared a series of cocrystals derived from an asymmetric β-diketone, benzoyl-4-pyridoylmethane (b4pm), as halogen bond acceptor and perfluorinated iodobenzenes: iodopentaflourobenzene (ipfb), 1,2-, 1,3- and 1,4-diiodotetraflorobenzene (12tfib, 13tfib and 14tfib) and 1,3,5-triiodo-2,4,6-trifluorobenzene (135titfb). All five cocrystals are assembled by I···N halogen bonds involving pyridyl nitrogen and iodoperfluorobenzene iodine resulting in 1:1 (four compounds) or 1:2 (one compound) cocrystal stoichiometry. Tautomer of b4pm in which hydrogen atom is adjacent to the pyridyl fragment was found to be more stable in vacuo than tautomer with a benzoyl hydroxyl group. This tautomer is also found to be dominant in the majority of crystal structures, somewhat more abundantly in crystal structures of cocrystals in which additional I···O halogen bond with the benzoyl oxygen has been established. Attempts have also been made to prepare an equivalent series of cocrystals using a closely related asymmetric β-diketone, benzoyl-3-pyridoylmethane (b3pm); however, all attempts were unsuccessful, which is attributed to more effective crystal packing of b3pm isomer compared to b4pm, which reduced the probability of cocrystal formation.
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Mohammadnezhad G, Farrokhpour H, Görls H, Plass W. Tautomerism in carbohydrate-derived salicylidene schiff bases: Solution, solid-state, and theoretical investigations. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129853] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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8
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Araya-Sibaja AM, Maduro de Campos CE, Fandaruff C, Vega-Baudrit JR, Guillén-Girón T, Navarro-Hoyos M, Cuffini SL. Irbesartan desmotropes: Solid-state characterization, thermodynamic study and dissolution properties. J Pharm Anal 2019; 9:339-346. [PMID: 31929943 PMCID: PMC6951487 DOI: 10.1016/j.jpha.2019.07.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 07/08/2019] [Accepted: 07/09/2019] [Indexed: 11/01/2022] Open
Abstract
Irbesartan (IBS) is a tetrazole derivative and antihypertensive drug that has two interconvertible structures, 1H- and 2H-tautomers. The difference between them lies in the protonation of the tetrazole ring. In the solid-state, both tautomers can be isolated as crystal forms A (1H-tautomer) and B (2H-tautomer). Studies have reported that IBS is a polymorphic system and its forms A and B are related monotropically. These reports indicate form B as the most stable and less soluble form. Therefore, the goal of this contribution is to demonstrate through a complete solid-state characterization, thermodynamic study and dissolution properties that the IBS forms are desmotropes that are not related monotropically. However, the intention is also to call attention to the importance of conducting strict chemical and in solid-state quality controls on the IBS raw materials. Hence, powder X-ray diffraction (PXRD) and Raman spectroscopy (RS) at ambient and non-ambient conditions, differential scanning calorimetry (DSC), hot stage microscopy (HSM), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM) techniques were applied. Furthermore, intrinsic dissolution rate (IDR) and structural stability studies at 98% relative humidity (RH), 25 °C and 40 °C were conducted as well. The results show that in fact, form A is approximately four-fold more soluble than form B. In addition, both IBS forms are stable at ambient conditions. Nevertheless, structural and/or chemical instability was observed in form B at 40 °C and 98% RH. IBS has been confirmed as a desmotropic system rather than a polymorphic one. Consequently, forms A and B are not related monotropically.
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Affiliation(s)
- Andrea Mariela Araya-Sibaja
- Laboratorio Nacional de Nanotecnología LANOTEC-CeNAT-CONARE, 1174-1200, Pavas, San José, Costa Rica
- Escuela de Ciencia e Ingeniería de los Materiales, Tecnológico de Costa Rica, Cartago, 159-7050, Costa Rica
- Escuela de Química, Universidad de Costa Rica, San Pedro de Montes de Oca, 2060, San José, Costa Rica
| | | | | | - José Roberto Vega-Baudrit
- Laboratorio Nacional de Nanotecnología LANOTEC-CeNAT-CONARE, 1174-1200, Pavas, San José, Costa Rica
- Laboratorio de Investigación y Tecnología de Polímeros POLIUNA, Escuela de Química, Universidad Nacional de Costa Rica, Heredia, 86-3000, Costa Rica
| | - Teodolito Guillén-Girón
- Escuela de Ciencia e Ingeniería de los Materiales, Tecnológico de Costa Rica, Cartago, 159-7050, Costa Rica
| | - Mirtha Navarro-Hoyos
- Escuela de Química, Universidad de Costa Rica, San Pedro de Montes de Oca, 2060, San José, Costa Rica
| | - Silvia Lucía Cuffini
- Instituto de Ciência e Técnica, Universidade Federal de São Paulo, São José dos Campos, São Paulo, Brazil
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9
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The Relationship between the Structure and Properties of Amino Acid Ionic Liquids. Molecules 2019; 24:molecules24183252. [PMID: 31500119 PMCID: PMC6767286 DOI: 10.3390/molecules24183252] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/03/2019] [Accepted: 09/04/2019] [Indexed: 11/17/2022] Open
Abstract
Ionic liquids based on different l-amino acids (glycine, l-valine, l-leucine, l-isoleucine, l-histidine, l-methionine, l-tyrosine, l-tryptophan, l-arginine, and l-threonine) and different cations (tetrabutylammonium (TBA), tributylmethylammonium (tBMA), didecyldimethylammonium (DDA), (2-hydroxyethyl)trimethylammonium (choline) (Chol), alkyl(C12-C14) dimethylbenzylammonium (benzalkonium) (BA), dodecyltrimethylammonium (DDTMA), hexadecyltrimethylammonium (HDTMA), octadecyltrimethylammonium (ODTMA) and 1-ethyl-3-methylimidazolium (EMIM)) have been synthesized and characterized by NMR and FTIR. Viscosity, specific rotation, surface activity, thermal stability (TG), and phase transformations (DSC) have been determined and compared with available data. Furthermore, benzalkonium, didecyldimethylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, and octadecyltrimethylammonium amino acid ionic liquids have been shown to exhibit surface activity. The dissolution of cellulose in amino acid ionic liquids (AAILs) composed of various cations was also investigated. Cellulose was only dissolved in EMIM salts of amino acids. In particular, the influence of the cation type on selected physicochemical and spectroscopic properties were discussed. The article is a mini review on amino acid ionic liquids.
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Asiri AM, Alzahrani KAH, Faidallah HM, Alamry KA, Jotani MM, Tiekink ERT. Co-crystallization of a neutral mol-ecule and its zwitterionic tautomer: structure and Hirshfeld surface analysis of 5-methyl-4-(5-methyl-1 H-pyrazol-3-yl)-2-phenyl-2,3-di-hydro-1 H-pyrazol-3-one 5-methyl-4-(5-methyl-1 H-pyrazol-2-ium-3-yl)-3-oxo-2-phenyl-2,3-di-hydro-1 H-pyrazol-1-ide monohydrate. Acta Crystallogr E Crystallogr Commun 2019; 75:565-570. [PMID: 31110787 PMCID: PMC6505615 DOI: 10.1107/s2056989019004389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 03/31/2019] [Indexed: 11/10/2022]
Abstract
The title compound, 2C14H14N4O·H2O, comprises a neutral mol-ecule containing a central pyrazol-3-one ring flanked by an N-bound phenyl group and a C-bound 5-methyl-1H-pyrazol-3-yl group (at positions adjacent to the carbonyl substituent), its zwitterionic tautomer, whereby the N-bound proton of the central ring is now resident on the pendant ring, and a water mol-ecule of crystallization. Besides systematic variations in geometric parameters, the two independent organic mol-ecules have broadly similar conformations, as seen in the dihedral angle between the five-membered rings [9.72 (9)° for the neutral mol-ecule and 3.32 (9)° for the zwitterionic tautomer] and in the dihedral angles between the central and pendant five-membered rings [28.19 (8) and 20.96 (8)° (neutral mol-ecule); 11.33 (9) and 11.81 (9)°]. In the crystal, pyrazolyl-N-H⋯O(carbon-yl) and pyrazolium-N-H⋯N(pyrazol-yl) hydrogen bonds between the independent organic mol-ecules give rise to non-symmetric nine-membered {⋯HNNH⋯NC3O} and {⋯HNN⋯HNC3O} synthons, which differ in the positions of the N-bound H atoms. These aggregates are connected into a supra-molecular layer in the bc plane by water-O-H⋯N(pyrazolide), water-O-H⋯O(carbon-yl) and pyrazolyl-N-H⋯O(water) hydrogen bonding. The layers are linked into a three-dimensional architecture by methyl-C-H⋯π(phen-yl) inter-actions. The different inter-actions, in particular the weaker contacts, formed by the organic mol-ecules are clearly evident in the calculated Hirshfeld surfaces, and the calculated electrostatic potentials differentiate the tautomers.
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Affiliation(s)
- Abdullah M. Asiri
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
- Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
| | - Khalid A. H. Alzahrani
- Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
| | - Hassan M. Faidallah
- Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
| | - Khalid A. Alamry
- Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
| | - Mukesh M. Jotani
- Department of Physics, Bhavan’s Sheth R. A. College of Science, Ahmedabad, Gujarat 380001, India
| | - Edward R. T. Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
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Durlak P, Latajka Z. Investigations of the hydrogen bond in the crystals of tropolone and thiotropolone via car‐parrinello and path integral molecular dynamics. J Comput Chem 2018; 40:671-687. [DOI: 10.1002/jcc.25753] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/21/2018] [Accepted: 10/22/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Piotr Durlak
- Faculty of ChemistryUniversity of Wrocław Wrocław 50‐383 Poland
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12
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Bouzayani N, Marque S, Djelassi B, Kacem Y, Marrot J, Ben Hassine B. Enantiopure Schiff bases of amino acid phenylhydrazides: impact of the hydrazide function on their structures and properties. NEW J CHEM 2018. [DOI: 10.1039/c7nj04597b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New chiral Schiff bases have been synthesized and characterized with an important contribution from quantum chemical calculations at the DFT level of theory. They have been evaluated for their physical and biological properties.
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Affiliation(s)
- Nadia Bouzayani
- Laboratoire de Synthèse Organique Asymétrique et Catalyse Homogène
- (UR 11ES56) Université de Monastir
- Faculté des Sciences de Monastir
- Monastir 5000
- Tunisia
| | - Sylvain Marque
- Université de Versailles
- Saint-Quentin-en-Yvelines
- Institut Lavoisier de Versailles (ILV)
- UMR CNRS 8180
- 78035 Versailles
| | - Brahim Djelassi
- Laboratoire des Maladies Transmissibles et Substances Biologiquement Actives
- Faculté de Pharmacie
- 5000 Monastir
- Tunisia
| | - Yakdhane Kacem
- Laboratoire de Synthèse Organique Asymétrique et Catalyse Homogène
- (UR 11ES56) Université de Monastir
- Faculté des Sciences de Monastir
- Monastir 5000
- Tunisia
| | - Jérôme Marrot
- Université de Versailles
- Saint-Quentin-en-Yvelines
- Institut Lavoisier de Versailles (ILV)
- UMR CNRS 8180
- 78035 Versailles
| | - Béchir Ben Hassine
- Laboratoire de Synthèse Organique Asymétrique et Catalyse Homogène
- (UR 11ES56) Université de Monastir
- Faculté des Sciences de Monastir
- Monastir 5000
- Tunisia
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13
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Synthesis, crystal structure, thermal, spectroscopic and theoretical studies of N3O2-donor Schiff base and its complex with CuII ions. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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14
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Hussain M, Jawaria R, Shafiq Z, Abbas G, Naseer MM. Ferrocene-based thiosemicarbazones: Solvent effect on thiol-thione tautomerism and conformational polymorphism. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Khan T, Datta A. Enhanced fluorescence with nanosecond dynamics in the solid state of metal ion complexes of alkoxy salophens. Phys Chem Chem Phys 2017; 19:30120-30127. [DOI: 10.1039/c7cp05429g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Incorporation of an alkoxy moiety dramatically alters the photophysics and molecular packing of aluminum complexes of salophen leading to enhanced emission in the solid state.
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Affiliation(s)
- Tuhin Khan
- Department of Chemistry
- Indian Institute of Technology Bombay
- Powai
- Mumbai-400076
- India
| | - Anindya Datta
- Department of Chemistry
- Indian Institute of Technology Bombay
- Powai
- Mumbai-400076
- India
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16
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Influence of modification of the amino acids ionic liquids on their physico-chemical properties: Ionic liquids versus ionic liquids-supported Schiff bases. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.09.111] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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2-Methylthio-imidazolins: a rare case of different tautomeric forms in solid state and in solution. Struct Chem 2016. [DOI: 10.1007/s11224-016-0860-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Pis-Diez R, Echeverría GA, Piro OE, Jios JL, Parajón-Costa BS. A structural, spectroscopic and theoretical study of an o-vanillin Schiff base derivative involved in enol-imine and keto-amine tautomerism. NEW J CHEM 2016. [DOI: 10.1039/c5nj01039j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potassium salt of the Schiff base derived from o-vanillin and taurine is involved in enol-imine (I) and keto-amine (II) tautomerism. Both tautomeric forms coexist in the crystal and they are stabilized by strong O–H⋯N and O⋯H–N intramolecular hydrogen bonds.
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Affiliation(s)
| | - Gustavo A. Echeverría
- Departamento de Física
- FCE (UNLP) and IFLP (CONICET, CCT-La Plata)
- CC 67
- La Plata
- Argentina
| | - Oscar E. Piro
- Departamento de Física
- FCE (UNLP) and IFLP (CONICET, CCT-La Plata)
- CC 67
- La Plata
- Argentina
| | - Jorge L. Jios
- Unidad PLAPIMU-LASEISIC (UNLP-CIC)
- Departamento de Química
- FCE (UNLP)
- La Plata
- Argentina
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Judith Percino M, Cerón M, Castro ME, Ramírez R, Soriano G, Chapela VM. (E)-2-[(2-hydroxybenzylidene)amino]phenylarsonic acid Schiff base: Synthesis, characterization and theoretical studies. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Tang HH, Zhang L, Zeng LL, Fang XM, Lin LR, Zhang H. A pair of Schiff base enantiomers studied by absorption, fluorescence, electronic and vibrational circular dichroism spectroscopies and density functional theory calculation. RSC Adv 2015. [DOI: 10.1039/c5ra02154e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
A pair of enantiomeric Schiff bases were synthesized and characterized, in particular their absolute configurations were determined by vibrational circular dichroism spectroscopy.
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Affiliation(s)
- Hui-Hui Tang
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
| | - Lu Zhang
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
| | - Li-Li Zeng
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
| | - Xue-Ming Fang
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
| | - Li-Rong Lin
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
| | - Hui Zhang
- College of Chemistry and Chemical Engineering
- The University of Xiamen
- Xiamen
- P. R. China
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22
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Juribašić M, Bregović N, Stilinović V, Tomišić V, Cindrić M, Šket P, Plavec J, Rubčić M, Užarević K. Supramolecular Stabilization of Metastable Tautomers in Solution and the Solid State. Chemistry 2014; 20:17333-45. [DOI: 10.1002/chem.201403543] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Indexed: 11/11/2022]
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23
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Ali ST, Antonov L, Fabian WMF. Phenol-quinone tautomerism in (arylazo)naphthols and the analogous Schiff bases: benchmark calculations. J Phys Chem A 2014; 118:778-89. [PMID: 24417622 DOI: 10.1021/jp411502u] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Tautomerization energies of a series of isomeric [(4-R-phenyl)azo]naphthols and the analogous Schiff bases (R = N(CH3)2, OCH3, H, CN, NO2) are calculated by LPNO-CEPA/1-CBS using the def2-TZVPP and def2-QZVPP basis sets for extrapolation. The performance of various density functionals (B3LYP, M06-2X, PW6B95, B2PLYP, mPW2PLYP, PWPB95) as well as MP2 and SCS-MP2 is evaluated against these results. M06-2X and SCS-MP2 yield results close to the LPNO-CEPA/1-CBS values. Solvent effects (CCl4, CHCl3, CH3CN, and CH3OH) are treated by a variety of bulk solvation models (SM8, IEFPCM, COSMO, PBF, and SMD) as well as explicit solvation (Monte Carlo free energy perturbation using the OPLSAA force field).
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Affiliation(s)
- S Tahir Ali
- Department of Chemistry, Federal Urdu University of Arts, Science & Technology , Karachi, Sindh, Pakistan
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24
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Filipczak K, Karolczak J, Lipkowski P, Filarowski A, Ziółek M. Photochromic cycle of 2'-hydroxyacetophenone azine studied by absorption and emission spectroscopy in different solvents. J Chem Phys 2013; 139:104305. [PMID: 24050342 DOI: 10.1063/1.4820136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
This paper reports on the investigations of the synthesized di-(o-hydroxyaryl ketoimine) compound by the steady state absorption and emission techniques as well as picosecond time resolved emission and femtosecond transient absorption methods in different solvents. The results of the experimental observation have been supported by the theoretical DFT and TD-DFT calculations. The theoretical data have revealed the completed influence of the environmental polarity on particular conformers of studied compound. Dependencies between the activation rate constant and polarizability function as well as Kamlet-Abbond-Taft hydrogen-bonding parameter have been obtained in different solvent. The mechanism of photodynamic changes of di-(o-hydroxyaryl ketoimine) is presented.
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Affiliation(s)
- Katarzyna Filipczak
- Photochemistry Laboratory, Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznan, Poland
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25
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Schilf W, Kamieński B, Szady-Chełmieniecka A, Kołodziej B, Grech E, Zarzeczańska D, Wcisło A, Ossowski T. Structure investigation of intramolecular hydrogen bond in some substituted salicylaldehydes and 4-aminoantipyrine derivatives in solution and in the solid state. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 109:47-54. [PMID: 23501717 DOI: 10.1016/j.saa.2013.01.094] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 01/23/2013] [Accepted: 01/28/2013] [Indexed: 06/01/2023]
Abstract
Seven imine derivatives obtained by condensation of appropriate aldehydes and salicylaldehydes with 4-aminoantipyrine were investigated in terms of intramolecular hydrogen bond structure. On the base of (1)H, (13)C and (15)N NMR measurements in solution and in the solid state we found out that all compounds which can form such structure exist as OH forms with strong H-bonds to nitrogen atom. The structure conclusions taken from NMR study were confirmed by pKa measurements. Surpassingly, the positions of protons in H-bridges only very slightly depend on the substituents in aldehyde used for condensation and on the phase (solution vs. solid state). The influence of antipyrine moiety seems to be the major factor defining H-bond structure.
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Affiliation(s)
- Wojciech Schilf
- Institute of Organic Chemistry, Polish Academy of Sciences, 44/52 Kasprzaka str., 01-224 Warsaw 42, POB 58, Poland.
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26
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Spectroscopic studies of amino acid ionic liquid-supported Schiff bases. Molecules 2013; 18:4986-5004. [PMID: 23629755 PMCID: PMC6269710 DOI: 10.3390/molecules18054986] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 04/08/2013] [Accepted: 04/17/2013] [Indexed: 11/16/2022] Open
Abstract
Amino acid ionic liquid-supported Schiff bases, derivatives of salicylaldehyde and various amino acids (l-threonine, l-valine, l-leucine, l-isoleucine and l-histidine) have been investigated by means of various spectroscopic techniques (NMR, UV-Vis, IR, MS) and deuterium isotope effects on 13C-NMR chemical shifts. The results have shown that in all studied amino acid ionic liquid-supported Schiff bases (except the l-histidine derivative) a proton transfer equilibrium exists and the presence of the COO− group stabilizes the proton transferred NH-form.
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27
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Deneva V, Manolova Y, Lubenov L, Kuteva V, Kamounah F, Nikolova R, Shivachev B, Antonov L. Controlled shift in the tautomeric equilibrium of 4-((phenylimino)methyl)naphthalen-1-ol. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.11.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Schilf W, Kamieński B, Užarević K. Nitrogen and carbon CPMAS NMR investigations of keto–enol tautomerism in asymmetric o-hydroxy Schiff bases. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Užarević K, Kokan Z, Perić B, Bregović N, Kirin SI. Concomitant polymorphism in the pseudo-peptide Me2N-pC6H4C(O)-Phe-OEt. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.07.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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30
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Li YX, Zhou HB, Miao JL, Sun GX, Li GB, Nie Y, Chen CL, Chen Z, Tao XT. Conformation twisting induced orientational disorder, polymorphism and solid-state emission properties of 1-(9-anthryl)-2-(1-naphthyl)ethylene. CrystEngComm 2012. [DOI: 10.1039/c2ce26098k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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