Zobrazeno 1 - 10 of 24 pro vyhledávání: '"Willy G, Santos"'
1
Inverse photochromism in viologen–tetraarylborate ion-pair complexes: optical write/microwave erase switching in polymer matrices
Autor: Willy G. Santos, Darya S. Budkina, Pedro F. G. M. da Costa, Daniel R. Cardoso, Alexander N. Tarnovsky, Malcolm D. E. Forbes
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
The spin dynamics of radical pairs from ion-pair complexes between viologen and tetraarylborate compounds have been investigated in the presence of microwave (μw) radiation, using steady-state electron paramagnetic resonance to follow the radical pa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18c3b55a253a7caa8e48f714fbc24ff9
https://doi.org/10.1039/d1ma01030a
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3
Ion-Pair Complexes of Pyrylium and Tetraarylborate as New Host–Guest Dyes: Photoinduced Electron Transfer Promoting Radical Polymerization
Autor: Willy G. Santos, Darya S. Budkina, Silvia H. Santagneli, Alexander N. Tarnovsky, Julio Zukerman-Schpector, Sidney J. L. Ribeiro
Publikováno v: The Journal of Physical Chemistry A. 123:7374-7383
Ultrafast transient absorption spectroscopy, NOESY-NMR, and EPR spectroscopy shed light on how π-π stacking interactions combined with electrostatic interactions can be used to form stable ion-pair complexes between pyrylium and tetraarylborate ion
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2240a3c2e87144f559b69b858603d731
https://doi.org/10.1021/acs.jpca.9b03581
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4
Polymerization Rate Modulated by Tetraarylborate Anion Structure: Direct Correlation of Hammett Substituent Constant with Polymerization Kinetics of 2-Hydroxyethyl Methacrylate
Autor: Fernando Mattiucci, Sidney José Lima Ribeiro, Willy G. Santos
Publikováno v: Macromolecules. 51:7905-7913
A series of para-substituted tetraarylborates were investigated as aryl radical generator for photopolymerization reactions, using 2-hydroxyethyl methacrylate as monomer. The first steps of the photopolymerization process involve the use of tetraaryl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9230b9c94c6b1c579559b160612ade08
https://doi.org/10.1021/acs.macromol.8b01361
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6
Light-Activated generation of nitric oxide (NO) and sulfite anion radicals (SO3-) from a ruthenium(ii) nitrosylsulphito complex
Autor: Daniel R. Cardoso, Antonio C. Roveda, Claudio Garino, Eduardo E. Castellano, Willy G. Santos, Maykon Lima Souza, Douglas Wagner Franco, Felipe S. Gonçalves, Charles N. Adelson
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
This manuscript describes the preparation of a new Ru(ii) nitrosylsulphito complex, trans-[Ru(NH3)4(isn)(N(O)SO3)]+ (complex 1), its spectroscopic and structural characterization, photochemistry, and thermal reactivity. Complex 1 was obtained by the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1092fada76fbd1b53fb590e704f7fd0e
http://hdl.handle.net/2318/1724459
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7
Caffeine metabolites not caffeine protect against riboflavin photosensitized oxidative damage related to skin and eye health
Autor: Willy G. Santos, Regina S. Scurachio, Leif H. Skibsted, Daniel R. Cardoso, F. Mattiucci
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Caffeine metabolites were found to bind riboflavin with dissociation constant in the millimolar region by an exothermic process with positive entropy of reaction, which was found by (1)H NMR and fluorescence spectroscopy to occur predominantly by hyd
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7811e58bf709464d43fe161f4a35cafc
https://doi.org/10.1016/j.jphotobiol.2016.08.042
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8
New insight into the photophysics and reactivity of trigonal and tetrahedral arylboron compounds
Autor: Daniel R. Cardoso, João Pina, Willy G. Santos, Douglas H. Burrows, Malcolm D. E. Forbes
Publikováno v: Photochemical & Photobiological Sciences. 15:1124-1137
The photophysics and reactivity of two tetraphenylborate salts and triphenylborane have been studied using ultrafast transient absorption, steady-state fluorescence, electron paramagnetic resonance with spin trapping, and DFT calculations. The single
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02db24a5cfaa34ff61bb0fa1c2124403
https://doi.org/10.1039/c6pp00169f
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9
Assembling and Using an LED-Based Detector To Monitor Absorbance Changes during Acid–Base Titrations
Autor: Willy G. Santos, Éder Tadeu Gomes Cavalheiro
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
A simple photometric assembly based in an LED as a light source and a photodiode as a detector is proposed in order to follow the absorbance changes as a function of the titrant volume added during the course of acid–base titrations in the presence
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88dd4c12879eabbbc22eb6822fe78f63
https://doi.org/10.1021/ed500931p
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10
Photoinduced Charge Shifts and Electron Transfer in Viologen-Tetraphenylborate Complexes: Push-Pull Character of the Exciplex
Autor: Victor M. Deflon, Alexander N. Tarnovsky, Malcolm D. E. Forbes, Willy G. Santos, Daniel R. Cardoso, Darya S. Budkina
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Viologen–tetraarylborate ion-pair complexes were prepared and investigated by steady-state and time-resolved spectroscopic techniques such as fluorescence and femtosecond transient absorption. The results highlight a charge transfer transition that
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d31902f9d701380a6a4450b447d5615f
https://pubmed.ncbi.nlm.nih.gov/28509547
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