1
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Enhanced fire-proofing performance and crystallizability of bio-based poly(L-lactic acid): Dual functions of a Schiff base-containing synergistic flame retardant. Int J Biol Macromol 2022; 222:305-324. [PMID: 36150571 DOI: 10.1016/j.ijbiomac.2022.09.163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/13/2022] [Accepted: 09/17/2022] [Indexed: 11/22/2022]
Abstract
Poly(L-lactic acid) (PLA) is a kind of important bio-macromolecule which can be prepared via fermentation of starch of maize and sweet potato. Flammability and extremely poor crystallizability limited its wide application. In this work, a novel Schiff base derivate (CP) was synthesized and, combined with ammonium polyphosphate (APP) as a synergistic flame retardant and nucleating agent to investigate its effects on LOI, UL-94 rating, thermal stability, combustion behavior and crystallizability of PLA. With loading of 5%CP/10%APP, PLA showed a significantly enhanced LOI and passed V-0 fire-safety rating with self-extinguish effect. PLA/5%CP/10%APP presented the lowest pHRR, THR and TSR, and highest char residue yield, FPI and FRI in cone calorimetry test, indicating an excellent flame retardancy effect, enhanced fire safety and longer escaping time in the fire. A continuous, compact and thick char layer structure formed as a protective barrier in combustion process, to enhance heat-insulating and oxygen resistance property, thermal stability and smoke-suppressing capacity of PLA. Flame retardancy mechanism was proposed and discussed based on comprehensive and in-depth characterization techniques. Also, 5%CP/10%APP presented a good nucleation effect to enormously increase crystallizability and shorten crystallization time of PLA.
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2
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Elroby SA, Banaser BA, Aziz SG, Jedidi A, Hassan WI, Osman OI. Zn 2+-Schiff's Base Complex as an "On-Off-On" Molecular Switch and a Fluorescence Probe for Cu 2+ and Ag + Ions. J Fluoresc 2022; 32:691-705. [PMID: 35040031 DOI: 10.1007/s10895-021-02864-4] [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: 10/14/2021] [Accepted: 11/29/2021] [Indexed: 11/30/2022]
Abstract
The present study presents a thorough theoretical analysis of the electronic structure and conformational preference of Schiff's base ligand N,N-bis(2-hydroxybenzilidene)-2,4,6-trimethyl benzene-1,3-diamine (H2L) and its metal complexes with Zn2+, Cu2+ and Ag+ ions. This study aims to investigate the behavior of H2L and the binuclear Zn2+ complex (1) as fluorescent probes for the detection of metal ions (Zn2+, Cu2+ and Ag+) using density functional theory (DFT) and time-dependent density functional theory (TDDFT). The six conformers of the H2L ligand were optimized using the B3LYP/6-311 + + G** level of theory, while the L-2-metal complexes were optimized by applying the B3LYP functional with the LANL2DZ/6-311 + + G** mixed basis set. The gas-phase and solvated Enol-cis isomer (E-cis) was found to be the most stable species. The absorption spectra of the E-cis isomer and its metal complexes were simulated using B3LYP, CAM-B3LYP, M06-2X and ωB97X functionals with a 6-311 + + G** basis set for C, O, N and H atoms and a LANL2DZ basis set for the metal ions (Zn2+, Cu2+ and Ag+). The computational results of the B3LYP functional were in excellent agreement with the experimental results. Hence, it was adopted for performing the emission calculations. The results indicated that metal complex (1) can act as a fluorescent chemosensor for the detection of Ag+ and Cu2+ ions through the mechanism of intermolecular charge transfer (ICT) and as a molecular switch "On-Off-On" via the replacement of Cu2+ by Ag+ ions, as proved experimentally.
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Affiliation(s)
- Shaaban A Elroby
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia. .,Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62511, Egypt.
| | | | - Saadullah G Aziz
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Abdesslem Jedidi
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Walid I Hassan
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Osman I Osman
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.,Chemistry Department, Faculty of Science, University of Khartoum, P.O. Box 321, Khartoum, 11111, Sudan
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3
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Kunzendorf A, Xu G, van der Velde JJH, Rozeboom HJ, Thunnissen AMWH, Poelarends GJ. Unlocking Asymmetric Michael Additions in an Archetypical Class I Aldolase by Directed Evolution. ACS Catal 2021; 11:13236-13243. [PMID: 34765282 PMCID: PMC8576802 DOI: 10.1021/acscatal.1c03911] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 10/02/2021] [Indexed: 01/06/2023]
Abstract
![]()
Class I aldolases
catalyze asymmetric aldol addition reactions
and have found extensive application in the biocatalytic synthesis
of chiral β-hydroxy-carbonyl compounds. However, the usefulness
of these powerful enzymes for application in other C–C bond-forming
reactions remains thus far unexplored. The redesign of class I aldolases
to expand their catalytic repertoire to include non-native carboligation
reactions therefore continues to be a major challenge. Here, we report
the successful redesign of 2-deoxy-d-ribose-5-phosphate aldolase
(DERA) from Escherichia coli, an archetypical
class I aldolase, to proficiently catalyze enantioselective Michael
additions of nitromethane to α,β-unsaturated aldehydes
to yield various pharmaceutically relevant chiral synthons. After
11 rounds of directed evolution, the redesigned DERA enzyme (DERA-MA)
carried 12 amino-acid substitutions and had an impressive 190-fold
enhancement in catalytic activity compared to the wildtype enzyme.
The high catalytic efficiency of DERA-MA for this abiological reaction
makes it a proficient “Michaelase” with potential for
biocatalytic application. Crystallographic analysis provides a structural
context for the evolved activity. Whereas an aldolase acts naturally
by activating the enzyme-bound substrate as a nucleophile (enamine-based
mechanism), DERA-MA instead acts by activating the enzyme-bound substrate
as an electrophile (iminium-based mechanism). This work demonstrates
the power of directed evolution to expand the reaction scope of natural
aldolases to include asymmetric Michael addition reactions and presents
opportunities to explore iminium catalysis with DERA-derived catalysts
inspired by developments in the organocatalysis field.
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Affiliation(s)
- Andreas Kunzendorf
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Guangcai Xu
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Jesse J. H. van der Velde
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Henriëtte J. Rozeboom
- Molecular Enzymology Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Andy-Mark W. H. Thunnissen
- Molecular Enzymology Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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El-Gammal OA, Mohamed FS, Rezk GN, El-Bindary AA. Structural characterization and biological activity of a new metal complexes based of Schiff base. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115522] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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5
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Dylong A, Dysz K, Bogdanowicz KA, Przybył W, Konieczny KA, Turowska-Tyrk I, Kaim A, Iwan A. Crystal Structure Determination of 4-[(Di-p-tolyl-amino)-benzylidene]-(5-pyridin-4-yl-[1,3,4]thiadiazol-2-yl)-imine along with Selected Properties of Imine in Neutral and Protonated Form with Camforosulphonic Acid: Theoretical and Experimental Studies. MATERIALS (BASEL, SWITZERLAND) 2021; 14:1952. [PMID: 33924588 PMCID: PMC8070542 DOI: 10.3390/ma14081952] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 11/17/2022]
Abstract
The crystal structure was determined for the first time for 4-[(di-p-tolyl-amino)benzylidene]-(5-pyridin-4-yl-[1,3,4]thiadiazol-2-yl)-imine (trans-PPL9) by X-ray diffraction. The imine crystallized in the monoclinic P21/n space group with a = 18.9567(7) Å, b = 6.18597(17) Å, c = 22.5897(7) Å, and β = 114.009(4)°. Intermolecular interactions in the PPL9 crystal were only weak C-H⋯N hydrogen bonds investigated using the Hirshfeld surface. The electronic and geometric structure of the imine were investigated by the density functional theory and the time-dependent density-functional theory. The properties of the imine in neutral and protonated form with camforosulphonic acid (CSA) were investigated using cyclic voltammetry, UV-vis and 1H NMR spectroscopy. Theoretical and experimental studies showed that for the 1:1 molar ratio the protonation occured on nitrogen in pyridine in the PPL9 structure, as an effect of Brönsted acid-base interactions. Thermographic camera was used to defined defects in constructed simple devices with ITO/PPL9 (or PPL9:CSA)/Ag/ITO architecture. In conclusion, a thermally stable imine was synthesized in crystalline form and by CSA doping, a modification of absorption spectra together with reduction of overheating process was observed, suggesting its potential application in optoelectronics.
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Affiliation(s)
- Agnieszka Dylong
- Military Institute of Engineer Technology, 136 Obornicka Str., 50-961 Wroclaw, Poland; (A.D.); (K.D.); (K.A.B.); (W.P.)
| | - Karolina Dysz
- Military Institute of Engineer Technology, 136 Obornicka Str., 50-961 Wroclaw, Poland; (A.D.); (K.D.); (K.A.B.); (W.P.)
| | - Krzysztof A. Bogdanowicz
- Military Institute of Engineer Technology, 136 Obornicka Str., 50-961 Wroclaw, Poland; (A.D.); (K.D.); (K.A.B.); (W.P.)
| | - Wojciech Przybył
- Military Institute of Engineer Technology, 136 Obornicka Str., 50-961 Wroclaw, Poland; (A.D.); (K.D.); (K.A.B.); (W.P.)
| | - Krzysztof A. Konieczny
- Faculty of Chemistry, Wrocław University of Science and Technology, 27 Wybrzeże Wyspiańskiego, 50-370 Wroclaw, Poland; (K.A.K.); (I.T.-T.)
| | - Ilona Turowska-Tyrk
- Faculty of Chemistry, Wrocław University of Science and Technology, 27 Wybrzeże Wyspiańskiego, 50-370 Wroclaw, Poland; (K.A.K.); (I.T.-T.)
| | - Andrzej Kaim
- Faculty of Chemistry, University of Warsaw, 1 Pasteura Str., 02-093 Warsaw, Poland;
| | - Agnieszka Iwan
- Military Institute of Engineer Technology, 136 Obornicka Str., 50-961 Wroclaw, Poland; (A.D.); (K.D.); (K.A.B.); (W.P.)
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Homocianu M. Optical properties of solute molecules: Environmental effects, challenges, and their practical implications. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Fang Z, Tan S, Wu F, Jiao Y, Au C, Wang Y, Shen J, Yi B. Solvent and substituent effects on ultraviolet absorption properties of Schiff bases—models of molecular-core of mesogenic compounds. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128590] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Sun Y, Wang Y, Qing Y, Wu X, Shi Z. A DOPO‐base Schiff derivative used as a flame retardant for polystyrene. J Appl Polym Sci 2020. [DOI: 10.1002/app.49224] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yu Sun
- College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University Qiqihar China
- College of Chemistry and Chemical EngineeringQiqihar University Qiqihar China
| | - Yazhen Wang
- College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University Qiqihar China
- College of Materials Science and EngineeringQiqihar University Qiqihar China
| | - Yingbo Qing
- College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University Qiqihar China
- College of Chemistry and Chemical EngineeringQiqihar University Qiqihar China
| | - Xueying Wu
- College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University Qiqihar China
- College of Chemistry and Chemical EngineeringQiqihar University Qiqihar China
| | - Zhen Shi
- College of Chemistry and Chemical Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University Qiqihar China
- College of Materials Science and EngineeringQiqihar University Qiqihar China
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9
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Ponnusamy K, Ramamurthy K, Chellappan S. Thermal-Induced Twisting and Photoinduced Planarization of Salicylideneaniline in Alcohols. J Phys Chem A 2020; 124:1885-1895. [PMID: 32077297 DOI: 10.1021/acs.jpca.9b09526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thermofluorochromism and photochromism of salicylideneaniline (SA) in alcohol were investigated using steady-state and time-resolved fluorescence and absorption spectroscopy. The planar trans-enol form of SA in alcohols is converted into the twisted trans-enol form on heating. This conversion results change in the emission maximum from the 530 to the 440 nm region with an increase in fluorescence intensity, which confirms the absence of intramolecular hydrogen bonding between imine nitrogen and phenolic hydrogen in the twisted trans-enol form. The activation barrier for thermal-induced formation of the twisted trans-enol form in methanol was determined experimentally and was found to be 20.15 ± 2.22 kcal/mol. The rotation of the phenolic C7-C8 and C7-N1 bond followed by breaking of the intramolecular hydrogen bond and formation of an intermolecular hydrogen bond with alcohol solvent molecules results in the thermally stable twisted trans-enol form in alcohol solvents. The biexponential nature of the fluorescence decay of the twisted trans-enol form of SA confirms that the emission originates from multiple (π-π* and n-π*) excited states. On photolysis under UV light, the twisted trans-enol form is converted back into the planar trans-enol form. The time-resolved absorption and excitation-resolved fluorescence spectrum of SA in methanol confirm the existence of the twisted cis-keto form as a transient photochromic intermediate in the light-induced planarization of SA in alcohols. In alcohols, an interplay between the intra- and intermolecular hydrogen-bonding controls excited-state reaction dynamics and conformational relaxation of SA, which are responsible for the photochromism of salicylideneaniline.
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Affiliation(s)
- Karunakaran Ponnusamy
- National Centre for Ultrafast Processes, University of Madras, Chennai 600 113 Tamil Nadu, India
| | - Kannan Ramamurthy
- National Centre for Ultrafast Processes, University of Madras, Chennai 600 113 Tamil Nadu, India
| | - Selvaraju Chellappan
- National Centre for Ultrafast Processes, University of Madras, Chennai 600 113 Tamil Nadu, India
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10
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A Ni(II) derivative incorporating tetradentate Schiff base precursor: Structure, spectral, electrochemical and DFT interpretation. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Zutterman F, Louant O, Mercier G, Leyssens T, Champagne B. Predicting Keto–Enol Equilibrium from Combining UV/Visible Absorption Spectroscopy with Quantum Chemical Calculations of Vibronic Structures for Many Excited States. A Case Study on Salicylideneanilines. J Phys Chem A 2018; 122:5370-5374. [DOI: 10.1021/acs.jpca.8b03389] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Freddy Zutterman
- Laboratoire de Chimie Théorique, Unité de Chimie-Physique Théorique et Structurale, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Orian Louant
- Laboratoire de Chimie Théorique, Unité de Chimie-Physique Théorique et Structurale, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles, 61, B-5000 Namur, Belgium
| | - Gabriel Mercier
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1 Place Louis Pasteur, B-1348 Louvain-La-Neuve, Belgium
| | - Tom Leyssens
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1 Place Louis Pasteur, B-1348 Louvain-La-Neuve, Belgium
| | - Benoît Champagne
- Laboratoire de Chimie Théorique, Unité de Chimie-Physique Théorique et Structurale, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles, 61, B-5000 Namur, Belgium
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12
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Yang AH, Deng C, Chen H, Wei YX, Wang YZ. A novel Schiff-base polyphosphate ester: Highly-efficient flame retardant for polyurethane elastomer. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2017.08.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Airinei A, Isac DL, Homocianu M, Cojocaru C, Hulubei C. Solvatochromic analysis and DFT computational study of an azomaleimide derivative. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.096] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Abd El-Lateef HM, Abu-Dief AM, Mohamed MA. Corrosion inhibition of carbon steel pipelines by some novel Schiff base compounds during acidizing treatment of oil wells studied by electrochemical and quantum chemical methods. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.10.078] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Tan A, Bozkurt E, Kara Y. Investigation of Solvent Effects on Photophysical Properties of New Aminophthalimide Derivatives-Based on Methanesulfonate. J Fluoresc 2017; 27:981-992. [DOI: 10.1007/s10895-017-2033-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 01/04/2017] [Indexed: 11/30/2022]
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16
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BOZKURT E, GÜL Hİ, TUĞRAK M. Investigation of solvent effect on photophysical properties of some sulfonamides derivatives. Turk J Chem 2017. [DOI: 10.3906/kim-1604-61] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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17
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Homocianu M, Airinei A. Intra-/inter-molecular interactions – Identification and evaluation by optical spectral data in solution. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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18
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Jiménez-Sánchez A, Santillan R. A photochromic-acidochromic HCl fluorescent probe. An unexpected chloride-directed recognition. Analyst 2016; 141:4108-20. [PMID: 27156709 DOI: 10.1039/c6an00509h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Non-classical protomerism of Schiff bases offers several advantages; for example, specific interactions in the -C[double bond, length as m-dash]N- linkage can be controlled and differentiated because the interactions are not governed by keto-enol tautomerism. Herein, the pH sensing properties of a new protomeric Schiff base probe () are reported. In particular, among several acids, the probe displays significant optical responses upon interaction with hydrochloric acid (HCl). X-ray structural analysis confirmed the existence of an intermolecular interaction with HCl through a -C[double bond, length as m-dash]NH-ClO- linkage. Moreover, an optical response via a second channel is manifested as photochromic fluorescence behavior. The properties of were investigated by UV-vis and fluorescence spectroscopy in a solution and the solid state. Its strong acidofluorochromic behavior was analyzed and its pKa and values were determined, which revealed a photobasic character. Positive solvatochromism that resulted from specific interactions taking place in was studied using four different solvent scales, namely, Lippert-Mataga, Kamlet-Taft, Catalán and the recently proposed scale of Laurence et al., which yielded consistent results. Finally, theoretical calculations were conducted to analyze the mechanism of the probe in terms of natural transition orbitals (NTOs) and the spatial extent of charge transfer excitations.
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Affiliation(s)
- Arturo Jiménez-Sánchez
- Facultad de Química, Universidad Nacional Autónoma de México, México, D. F. 04510, México.
| | - Rosa Santillan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del IPN, CINVESTAV, Apdo. Postal 14-740, México, D. F. 07000, México
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Garrabou X, Wicky BIM, Hilvert D. Fast Knoevenagel Condensations Catalyzed by an Artificial Schiff-Base-Forming Enzyme. J Am Chem Soc 2016; 138:6972-4. [DOI: 10.1021/jacs.6b00816] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xavier Garrabou
- Laboratory of Organic Chemistry, ETH Zurich, 8093 Zurich, Switzerland
| | | | - Donald Hilvert
- Laboratory of Organic Chemistry, ETH Zurich, 8093 Zurich, Switzerland
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20
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Novoa N, Roisnel T, Dorcet V, Cador O, Manzur C, Carrillo D, Hamon JR. Efficient preparation of multimetallic ONO-based Schiff base complexes of nickel(ii) and copper(ii). NEW J CHEM 2016. [DOI: 10.1039/c6nj00932h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Spectroscopy, structures, electrochemical behavior and magnetic properties of a series of readily prepared [(R-ONO)M(μ-4,4′-bipy)M(R-ONO)] complexes (R = anisyl or ferrocenyl; M = Ni, Cu) have been explored.
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Affiliation(s)
- Néstor Novoa
- Laboratorio de Química Inorgánica
- Instituto de Química
- Pontificia Universidad Católica de Valparaíso
- Valparaíso
- Chile
| | - Thierry Roisnel
- UMR 6226 Institut des Sciences Chimiques de Rennes
- CNRS-Université de Rennes 1
- 35042 Rennes Cedex
- France
| | - Vincent Dorcet
- UMR 6226 Institut des Sciences Chimiques de Rennes
- CNRS-Université de Rennes 1
- 35042 Rennes Cedex
- France
| | - Olivier Cador
- UMR 6226 Institut des Sciences Chimiques de Rennes
- CNRS-Université de Rennes 1
- 35042 Rennes Cedex
- France
| | - Carolina Manzur
- Laboratorio de Química Inorgánica
- Instituto de Química
- Pontificia Universidad Católica de Valparaíso
- Valparaíso
- Chile
| | - David Carrillo
- Laboratorio de Química Inorgánica
- Instituto de Química
- Pontificia Universidad Católica de Valparaíso
- Valparaíso
- Chile
| | - Jean-René Hamon
- UMR 6226 Institut des Sciences Chimiques de Rennes
- CNRS-Université de Rennes 1
- 35042 Rennes Cedex
- France
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21
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Li Y, Zhang Y, Niu H, Wang C, Qin C, Bai X, Wang W. Schiff bases containing triphenylamine and pyrrole units: synthesis and electrochromic, acidochromic properties. NEW J CHEM 2016. [DOI: 10.1039/c6nj00321d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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22
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Zhu Y, Xiao L, Zhao M, Zhou J, Zhang Q, Wang H, Li S, Zhou H, Wu J, Tian Y. A Series of Imidazole Derivatives: Synthesis, Two-Photon Absorption, and Application for Bioimaging. BIOMED RESEARCH INTERNATIONAL 2015; 2015:965386. [PMID: 26579544 PMCID: PMC4633690 DOI: 10.1155/2015/965386] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Accepted: 12/30/2014] [Indexed: 12/31/2022]
Abstract
A new series of D-π-A type imidazole derivatives have been synthesized and characterized. Two corresponding imidazolium salts (iodine and hexafluorophosphate) were prepared from the imidazole compound. Their electron-withdrawing ability can be largely tunable by salt formation reaction or ion exchange. UV-vis absorption and single-photon fluorescence spectra have been systematically investigated in different solvents. The two-photon cross sections (δ 2PA) of the imidazole derivatives are measured by two-photon excited fluorescence (2PEF) method. Compared with those of T-1 (107 GM) and T-3 (96 GM), T-2 (imidazolium iodine salt) has a large two-photon absorption (2PA) cross section value of 276 GM. Furthermore, the cytotoxicity and applications in bioimaging for the imidazole derivatives were carried out. The results showed that T-1 can be used as a lysosomal tracker with high stability and water solubility within pHs of 4-6, while T-2 and T-3 can be used as probes for cell cytoplasm.
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Affiliation(s)
- Yingzhong Zhu
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Lufei Xiao
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
- Department of Food and Environmental Engineering, Chuzhou Vocational and Technical College, Chuzhou 239000, China
| | - Meng Zhao
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Jiazheng Zhou
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Qiong Zhang
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Hui Wang
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Shengli Li
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Hongping Zhou
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Jieying Wu
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
| | - Yupeng Tian
- Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230601, China
- State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China
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Naik AD, Fontaine G, Bellayer S, Bourbigot S. Crossing the Traditional Boundaries: Salen-Based Schiff Bases for Thermal Protective Applications. ACS APPLIED MATERIALS & INTERFACES 2015; 7:21208-21217. [PMID: 26348914 DOI: 10.1021/acsami.5b05164] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A broad spectrum of applications of "Salen"-based Schiff bases tagged them as versatile multifunctional materials. However, their applicability is often bounded by a temperature threshold and, thus, they have rarely been used for high temperature applications. Our investigation of a classical Schiff base, N,N'-bis(4-hydroxysalicylidene)ethylenediamine (L2), reveals that it displays an intriguingly combative response to an elevated temperature/fire scenario. L2 resists and regulates thermal degradation by forming an ablative surface, and acts as a thermal shield. A polycondensation via covalent cross-linking, which forms a hyperbranched cross-linked resin is found to constitute the origin of the ablative surface. This is a unique example of a resin formation produced with a Schiff base, that mimicks the operational strategy of a high-heat resistant phenolic resin. Further applicability of L2, as a flame retardant, was tested in an engineering polymer, polyamide-6. It was found that it reinforces the polymer against fire risks by the formation of an intumescent coating. This paves the way for a new strategic avenue in safeguarding polymeric materials toward fire risks. Further, this material represents a promising start for thermal protective applications.
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Affiliation(s)
- Anil D Naik
- ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France
| | - Gaëlle Fontaine
- ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France
| | - Séverine Bellayer
- ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France
| | - Serge Bourbigot
- ISP/UMET-UMR/CNRS 8207, Ecole Nationale Supérieure de Chimie de Lille (ENSCL) , Avenue Dimitri Mendeleïev-Bât. C7a, BP 90108, 59652, Villeneuve d'Ascq Cedex, France
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24
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Guo J, Liu L, Jia D, Guo M, Zhang Y, Song X. Photochromism and fluorescence modulation of pyrazolone derivatives in the solid state. NEW J CHEM 2015. [DOI: 10.1039/c4nj01970a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel photochromic pyrazolones were synthesized, and their photochromic performance was investigated in the solid state.
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Affiliation(s)
- Jixi Guo
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
| | - Li Liu
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
| | - Dianzeng Jia
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
| | - Mingxi Guo
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
| | - Yucai Zhang
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
| | - Xianli Song
- Key Laboratory of Material and Technology for Clean Energy
- Ministry of Education; Key Laboratory of Advanced Functional Materials
- Autonomous Region; Institute of Applied Chemistry
- Xinjiang University
- Urumqi 830046
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