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Ren H, Qiu XP, Shi Y, Yang P, Winnik FM. pH-Dependent Morphology and Photoresponse of Azopyridine-Terminated Poly( N-isopropylacrylamide) Nanoparticles in Water. Macromolecules 2019; 52:2939-2948. [PMID: 31496545 PMCID: PMC6727601 DOI: 10.1021/acs.macromol.9b00193] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 03/17/2019] [Indexed: 01/01/2023]
Abstract
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A series of azopyridine-terminated
poly(N-isopropylacrylamide)s
(PNIPAM) (C12-PN-AzPy) (∼5000 < Mw < 20 000 g mol–1, polydispersity index
1.25 or less) were prepared by reversible addition–fragmentation
chain-transfer polymerization of NIPAM in the presence of a chain-transfer
agent that contains an AzPy group and an n-dodecyl
chain. In cold water, the polymers form nanoparticles (5.9 nm < Rh < 10.9 nm) that were characterized by light
scattering (LS), 1H NMR diffusion experiments, and high-resolution
transmission electron microscopy. We monitored the pH-dependent photoisomerization
of C12-PN-AzPy nanoparticles by steady-state and time-resolved UV–vis
absorption spectroscopy. Azopyridine is known to undergo a very fast
cis-to-trans thermal relaxation when the azopyridine nitrogen is quaternized
or bound to a hydrogen bond donor. The cis-to-trans thermal relaxation
of the AzPy chromophore in an acidic nanoparticle suspension is very
fast with a half-life τ = 2.3 ms at pH 3.0. It slows down slightly
for nanoparticles in neutral water (τ = 0.96 s, pH 7.0), and
it is very slow for AzPy-PNIPAM particles in alkaline medium (τ
> 3600 s, pH 10). The pH-dependent dynamics of the cis-to-trans
dark
relaxation, supported by Fourier transform infrared spectroscopy, 1H NMR spectroscopy, and LS analysis, suggest that in acidic
medium, the nanoparticles consist of a core of assembled C12 chains
surrounded by a shell of hydrated PNIPAM chains with the AzPy+ end groups preferentially located near the particle/water
interface. In neutral medium, the shell surrounding the core contains
AzPy groups H-bonded to the amide hydrogen of the PNIPAM chain repeat
units. At pH 10.0, the amide hydrogen binds preferentially to the
hydroxide anions. The AzPy groups reside preferentially in the vicinity
of the C12 core of the nanoparticles. The morphology of the nanoparticles
results from the competition between the segregation of the hydrophobic
and hydrophilic components and weak attractive interactions, such
as H-bonds between the AzPy groups and the amide hydrogen of the PNIPAM
repeat units.
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Affiliation(s)
- Hao Ren
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Xing-Ping Qiu
- Department of Chemistry, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, Quebec H3C 3J7, Canada
| | - Yan Shi
- School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Peng Yang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
| | - Françoise M Winnik
- Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, PB 55, Helsinki FI00140 Finland.,International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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2
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Luconi L, Kissel AA, Rossin A, Khamaletdinova NM, Cherkasov AV, Tuci G, Fukin GK, Trifonov AA, Giambastiani G. C
1 and Cs 2-pyridylethylanilido zirconium(iv), yttrium(iii) and lutetium(iii) complexes: synthesis, characterization and catalytic activity in the isoprene polymerization. NEW J CHEM 2017. [DOI: 10.1039/c6nj03193e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Organolanthanide containing Cs and C1-symmetric 2-pyridylethylanilido ligands have been scrutinized as catalyst precursors for the isoprene polymerization.
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Affiliation(s)
- Lapo Luconi
- Institute of Chemistry of OrganoMetallic Compounds
- ICCOM-CNR
- Florence
- Italy
| | - Alexander A. Kissel
- G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Andrea Rossin
- Institute of Chemistry of OrganoMetallic Compounds
- ICCOM-CNR
- Florence
- Italy
| | - Nadiya M. Khamaletdinova
- G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Anton V. Cherkasov
- G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Giulia Tuci
- Institute of Chemistry of OrganoMetallic Compounds
- ICCOM-CNR
- Florence
- Italy
| | - Georgy K. Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
| | - Alexander A. Trifonov
- G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences
- 603950 Nizhny Novgorod
- Russia
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow, GSP-1
| | - Giuliano Giambastiani
- Institute of Chemistry of OrganoMetallic Compounds
- ICCOM-CNR
- Florence
- Italy
- Kazan Federal University
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3
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Johnson TC, Marsden SP. Precious-Metal-Free Heteroarylation of Azlactones: Direct Synthesis of α-Pyridyl, α-Substituted Amino Acid Derivatives. Org Lett 2016; 18:5364-5367. [DOI: 10.1021/acs.orglett.6b02731] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Tarn C. Johnson
- School of Chemistry and Institute
of Process Research and Development, University of Leeds, Leeds, LS2 9JT, U.K
| | - Stephen P. Marsden
- School of Chemistry and Institute
of Process Research and Development, University of Leeds, Leeds, LS2 9JT, U.K
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4
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Inclán M, Albelda MT, Carbonell E, Blasco S, Bauzá A, Frontera A, García-España E. Molecular recognition of nucleotides in water by scorpiand-type receptors based on nucleobase discrimination. Chemistry 2014; 20:3730-41. [PMID: 24574302 DOI: 10.1002/chem.201303861] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 12/20/2013] [Indexed: 12/19/2022]
Abstract
The detection of nucleotides is of crucial importance because they are the basic building blocks of nucleic acids. Scorpiand-based polyamine receptors functionalized with pyridine or anthracene units are able to form stable complexes with nucleotides in water, based on coulombic, π-π stacking, and hydrogen-bonding interactions. This behavior has been rationalized by means of an exploration with NMR spectroscopy and DFT calculations. Binding constants were determined by potentiometry. Fluorescence spectroscopy studies have revealed the potential of these receptors as sensors to effectively and selectively distinguish guanosine-5'-triphosphate (GTP) from adenosine-5'-triphosphate (ATP).
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Affiliation(s)
- Mario Inclán
- Molecular Science Institute (ICMol), Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna (Spain)
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5
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Allouche F, Chabchoub F, Carta F, Supuran CT. Synthesis of aminocyanopyrazoles via a multi-component reaction and anti-carbonic anhydrase inhibitory activity of their sulfamide derivatives against cytosolic and transmembrane isoforms. J Enzyme Inhib Med Chem 2012; 28:343-9. [DOI: 10.3109/14756366.2012.720573] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Fatma Allouche
- Laboratoire de Chimie Appliquée: Hétérocycles, Corps Gras et Polymères Faculté des Sciences de Sfax,
3018 Sfax, Tunisie
| | - Fakher Chabchoub
- Laboratoire de Chimie Appliquée: Hétérocycles, Corps Gras et Polymères Faculté des Sciences de Sfax,
3018 Sfax, Tunisie
| | - Fabrizio Carta
- University of Florence, dipartimento di Scienze Farmaceutiche,
Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Claudiu T. Supuran
- University of Florence, dipartimento di Scienze Farmaceutiche,
Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
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6
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Vishwanatha T, Narendra N, Sureshbabu VV. Synthesis of β-lactam peptidomimetics through Ugi MCR: first application of chiral Nβ-Fmoc amino alkyl isonitriles in MCRs. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.090] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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7
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Giordano L, Hoang CT, Shipman M, Tucker JHR, Walsh TR. Aziridine Scaffolds for the Detection and Quantification of Hydrogen-Bonding Interactions through Transition-State Stabilization. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201005580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Giordano L, Hoang CT, Shipman M, Tucker JHR, Walsh TR. Aziridine scaffolds for the detection and quantification of hydrogen-bonding interactions through transition-state stabilization. Angew Chem Int Ed Engl 2011; 50:741-4. [PMID: 21226167 DOI: 10.1002/anie.201005580] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 10/26/2010] [Indexed: 11/05/2022]
Affiliation(s)
- Luciana Giordano
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT UK
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9
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Rishton GM. Molecular diversity in the context of leadlikeness: compound properties that enable effective biochemical screening. Curr Opin Chem Biol 2008; 12:340-51. [PMID: 18328272 DOI: 10.1016/j.cbpa.2008.02.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Accepted: 02/07/2008] [Indexed: 12/12/2022]
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10
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Dömling A. Recent developments in isocyanide based multicomponent reactions in applied chemistry. Chem Rev 2006; 106:17-89. [PMID: 16402771 DOI: 10.1021/cr0505728] [Citation(s) in RCA: 3387] [Impact Index Per Article: 188.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Hanyu M, Ninomiya D, Yanagihara R, Murashima T, Miyazawa T, Yamada T. Studies on intramolecular hydrogen bonding between the pyridine nitrogen and the amide hydrogen of the peptide: synthesis and conformational analysis of tripeptides containing novel amino acids with a pyridine ring. J Pept Sci 2005; 11:491-8. [PMID: 15747319 DOI: 10.1002/psc.647] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
For the first time tripeptides, Z-AA(1)-Xaa-AA(3)-OMe (AA(1) and AA(3) = Gly or Aib, Xaa = 2Pmg and 2Pyg) were prepared containing alpha-methyl-alpha-(2-pyridyl)glycine (2Pmg) and alpha-(2-pyridyl)glycine (2Pyg) by solid-phase Ugi reaction. These results clearly indicate that for the preparation of tripeptides containing an amino acid with a pyridine ring, the solid-phase Ugi reaction is very useful.NMR analysis clarified that 2Pmg-containing tripeptides adopt a unique conformation with an intramolecular hydrogen bond between 2Pmg-NH and the pyridine nitrogen. However, in the case of Z-Gly-2Pyg-Gly-OMe, the intramolecular hydrogen bonding between 2Pyg-NH and the pyridine nitrogen was not observed, whereas Z-Aib-2Pyg-Aib-OMe adopts a unique conformation with an intramolecular hydrogen bond between 2Pyg-NH and a pyridine nitrogen. Conformational analysis of the tripeptides, Z-AA(1)-Xaa-AA(3)-OMe (AA(1), AA(3) = Gly or Aib, Xaa = alpha,alpha-di(2-pyridyl)glycine (2Dpy), alpha-phenyl-alpha-(2-pyridyl)glycine (2Ppg), 2Pmg and 2Pyg), clarified that when an alpha,alpha-disubstituted glycine with a 2-pyridyl group at an alpha-carbon atom is introduced into any peptide, an intramolecular hydrogen bond between a pyridine nitrogen and an amide proton is formed and conformational mobility of the peptide backbone is restricted.
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Affiliation(s)
- Masayuki Hanyu
- Department of Chemistry, Faculty of Science and Engineering, Konan University, Higashinada-ku, Kobe, Japan
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12
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Hanyu M, Murashima T, Miyazawa T, Yamada T. Synthesis of tripeptides containing a very crowded α,α-disubstituted glycine with pyridine rings by solid-phase Ugi reaction. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.171] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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