Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly

Solid niobium oxides (Nb2O5·nH2O) and niobium phosphate were used as heterogeneous acid catalysts to promote the condensation between a switchable oxazine and a fluorescent coumarin in an aprotic solvent. The catalysts were found to promote the generation of an active methylene from the enamine-base...

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Autores principales:	Impellizzeri, S., Simoncelli, S., Fasciani, C., Marin, M.L., Hallett-Tapley, G.L., Hodgson, G.K., Scaiano, J.C.
Formato:	JOUR
Materias:	Catalysts Condensation Fluorescence Fluorescence microscopy Fluorophores Niobium Nitrogen compounds Refractive index Aprotic solvents Catalyst surfaces Heterogeneous acid catalysts In-situ condensations Niobium phosphates Nucleophilic attack Switchable Total internal reflection fluorescence microscopy Niobium oxide
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_20444753_v5_n1_p169_Impellizzeri
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_20444753_v5_n1_p169_Impellizzeri
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spelling	todo:paper_20444753_v5_n1_p169_Impellizzeri2023-10-03T16:38:08Z Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly Impellizzeri, S. Simoncelli, S. Fasciani, C. Marin, M.L. Hallett-Tapley, G.L. Hodgson, G.K. Scaiano, J.C. Catalysts Condensation Fluorescence Fluorescence microscopy Fluorophores Niobium Nitrogen compounds Refractive index Aprotic solvents Catalyst surfaces Heterogeneous acid catalysts In-situ condensations Niobium phosphates Nucleophilic attack Switchable Total internal reflection fluorescence microscopy Niobium oxide Solid niobium oxides (Nb2O5·nH2O) and niobium phosphate were used as heterogeneous acid catalysts to promote the condensation between a switchable oxazine and a fluorescent coumarin in an aprotic solvent. The catalysts were found to promote the generation of an active methylene from the enamine-based portion of the oxazine, which was followed by a nucleophilic attack on the aldehyde functionality of the coumarin reagent. In the resulting system, the emission of the conjugated fluorophore can be observed at 670 nm and, thus, the processes occurring at the catalyst surface can be monitored in real time by total internal reflection fluorescence microscopy (TIRFM). © The Royal Society of Chemistry 2015. Fil:Simoncelli, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20444753_v5_n1_p169_Impellizzeri
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Catalysts Condensation Fluorescence Fluorescence microscopy Fluorophores Niobium Nitrogen compounds Refractive index Aprotic solvents Catalyst surfaces Heterogeneous acid catalysts In-situ condensations Niobium phosphates Nucleophilic attack Switchable Total internal reflection fluorescence microscopy Niobium oxide
spellingShingle	Catalysts Condensation Fluorescence Fluorescence microscopy Fluorophores Niobium Nitrogen compounds Refractive index Aprotic solvents Catalyst surfaces Heterogeneous acid catalysts In-situ condensations Niobium phosphates Nucleophilic attack Switchable Total internal reflection fluorescence microscopy Niobium oxide Impellizzeri, S. Simoncelli, S. Fasciani, C. Marin, M.L. Hallett-Tapley, G.L. Hodgson, G.K. Scaiano, J.C. Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
topic_facet	Catalysts Condensation Fluorescence Fluorescence microscopy Fluorophores Niobium Nitrogen compounds Refractive index Aprotic solvents Catalyst surfaces Heterogeneous acid catalysts In-situ condensations Niobium phosphates Nucleophilic attack Switchable Total internal reflection fluorescence microscopy Niobium oxide
description	Solid niobium oxides (Nb2O5·nH2O) and niobium phosphate were used as heterogeneous acid catalysts to promote the condensation between a switchable oxazine and a fluorescent coumarin in an aprotic solvent. The catalysts were found to promote the generation of an active methylene from the enamine-based portion of the oxazine, which was followed by a nucleophilic attack on the aldehyde functionality of the coumarin reagent. In the resulting system, the emission of the conjugated fluorophore can be observed at 670 nm and, thus, the processes occurring at the catalyst surface can be monitored in real time by total internal reflection fluorescence microscopy (TIRFM). © The Royal Society of Chemistry 2015.
format	JOUR
author	Impellizzeri, S. Simoncelli, S. Fasciani, C. Marin, M.L. Hallett-Tapley, G.L. Hodgson, G.K. Scaiano, J.C.
author_facet	Impellizzeri, S. Simoncelli, S. Fasciani, C. Marin, M.L. Hallett-Tapley, G.L. Hodgson, G.K. Scaiano, J.C.
author_sort	Impellizzeri, S.
title	Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
title_short	Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
title_full	Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
title_fullStr	Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
title_full_unstemmed	Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
title_sort	mechanistic insights into the nb2o5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly
url	http://hdl.handle.net/20.500.12110/paper_20444753_v5_n1_p169_Impellizzeri
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Mechanistic insights into the Nb2O5 and niobium phosphate catalyzed in situ condensation of a fluorescent halochromic assembly

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