Encapsulation and characterisation of cationic benzo[a]phenoxazines in zeolite HY


Güney O. , Goncalves M. S. T. , Fonseca A. M. , Soares O. S. G. P. , Pereira M. F. R. , Neves I. C.

NEW JOURNAL OF CHEMISTRY, vol.43, no.39, pp.15785-15792, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 39
  • Publication Date: 2019
  • Doi Number: 10.1039/c9nj03756j
  • Title of Journal : NEW JOURNAL OF CHEMISTRY
  • Page Numbers: pp.15785-15792

Abstract

Different cationic fluorochromophores were sucessfully encapsulated by ship-in-the-bottle synthesis into supercages of zeolite HY. The cationic fluorochromophores are N-(5-amino-10-methyl-9H-benzo[a]phenoxazin-9-ylidene)ethanaminium (1a), N-(10-methyl-5-(propylamino)-9H-benzo[a]phenoxazin-9-ylidene)ethanaminium (1b), N-(5-(isopentylamino)-10-methyl-9H-benzo[a]phenoxazin-9-ylidene)ethanaminium (1c) and N-1-((5-(isopentylamino)-9H-benzo[a]phenoxazin-9-ylidene)propane-1,3-diaminium)monobromide (1d). The success of encapsulation was proved by TGA and N-2 adsorption analysis showing that zeolite Y is an excellent host for the stabilization of these fluorochromophores. Photophysical characterisation of encapsulated fluorochromophores by UV-Visible absorption and fluorescence confirmed their location inside the zeolite supercages. Thus, it was possible to develop a new approach to synthesize materials possessing benzo[a]phenoxazinium derivatives, which are potential optical sensors with high stability, without the need for solution synthesis of fluorochromophores.