HETEROCYCLES

Communication | Regular issue | Vol. 83, No. 12, 2011, pp. 2769-2772
Received, 3rd August, 2011, Accepted, 30th September, 2011, Published online, 7th October, 2011.
DOI: 10.3987/COM-11-12324

■ Intrinsic Fluorescence of 1,3-Benzoxazinephanes

Rodolfo Quevedo* and Cesar A. Sierra

Chemistry Department, Faculty of Science, Universidad Nacional de Colombia, Ciudad Universitaria, Carrera 30 # 45-03, Bogotá, Colombia

Abstract

A new 1,3-benzoxazine nuclei-based fluorescent system is presented. The photophysical aspects are briefly discussed. The results suggested that the presence of oxazinic methylenes is necessary for fluorescence to be present.

The cyclophanes are macrocyclic compounds containing two or more aromatic rings bounded at their meta or para positions by means of short spacers.1 Due to the aromatic rings’ high electron density, these macrocycles have interesting properties and great potential as hosts due to their ability to trap guest molecules, mainly through non-covalent interactions such as Van der Waals, π−π, π-cation, ion-dipole,

The cyclophanes are macrocyclic compounds containing two or more aromatic rings bounded at their meta or para positions by means of short spacers.1 Due to the aromatic rings’ high electron density, these macrocycles have interesting properties and great potential as hosts due to their ability to trap guest molecules, mainly through non-covalent interactions such as Van der Waals, π−π, π-cation, ion-dipole,

The cyclophanes are macrocyclic compounds containing two or more aromatic rings bounded at their meta or para positions by means of short spacers.1 Due to the aromatic rings’ high electron density, these macrocycles have interesting properties and great potential as hosts due to their ability to trap guest molecules, mainly through non-covalent interactions such as Van der Waals, π−π, π-cation, ion-dipole,

The cyclophanes are macrocyclic compounds containing two or more aromatic rings bounded at their meta or para positions by means of short spacers.1 Due to the aromatic rings’ high electron density, these macrocycles have interesting properties and great potential as hosts due to their ability to trap guest molecules, mainly through non-covalent interactions such as Van der Waals, π−π, π-cation, ion-dipole,

The cyclophanes are macrocyclic compounds containing two or more aromatic rings bounded at their meta or para positions by means of short spacers.1 Due to the aromatic rings’ high electron density, these macrocycles have interesting properties and great potential as hosts due to their ability to trap guest molecules, mainly through non-covalent interactions such as Van der Waals, π−π, π-cation, ion-dipole,

In summary, this work presents a new 1,3-benzoxazine nuclei-based fluorescent system. The photophysical behavior of compounds 1, 2, 3 and 4 suggested that presence of the oxazinic methylenes group is necessary for fluorescence and that the benzoxazinephanes’ rigid structure increases emission intensity in the visible region of the spectra.

ACKNOWLEDGEMENTS
The author wish to acknowledge the División de Investigaciones Bogotá (DIB) and the Universidad Nacional de Colombia for providing financial support.

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