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Dye‐Loaded Zeolite L Sandwiches as Artificial Antenna Systems for Light Transport
Author(s) -
Pauchard Marc,
Devaux André,
Calzaferri Gion
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20000915)6:18<3456::aid-chem3456>3.0.co;2-5
Subject(s) - zeolite , fluorescence , adsorption , molecule , ion exchange , materials science , antenna (radio) , nanocrystal , chemistry , chemical engineering , nanotechnology , ion , optics , organic chemistry , catalysis , physics , engineering , telecommunications , computer science
The synthesis and characterization of dye loaded zeolite L sandwiches acting as artificial antenna systems for light harvesting and transport is reported. A set of experimental tools for the preparation of neutral dye‐zeolite L materials ranging from low to maximum packing densities has been developed. The role of co‐adsorbed water and the distribution of molecules between the inner and the outer surface were found to be the determining parameters. p ‐Terphenyl ( p TP) turned out to be very suitable for studying these and other relevant parameters of neutral dye‐zeolite L materials. We observed that p TP located in the channels of zeolite L can reversibly be displaced by water. This can be used when synthesizing such materials. We also observed that all‐ trans ‐1,6‐diphenyl‐1,3,5‐hexatriene (DPH) which is very photolabile in solution is stable after insertion into zeolite L. By combining our extensive knowledge of these systems with ion‐exchange procedures developed in an earlier study, we have realized the first bi‐directional three‐dye antenna. In this material the near UV absorbing compounds DPH or 1,2‐bis‐(5‐methyl‐benzoxazol‐2‐yl)‐ethene (MBOXE) are located in the middle part of zeolite L nanocrystals followed on both sides by pyronine (Py) and then by oxonine (Ox) as acceptors. Fluorescence of the oxonine located at both ends of the cylindrical zeolite L crystals was observed upon excitation of the near UV absorber in the middle section at 353 nm, where neither oxonine nor pyronine absorb a significant amount of the excitation light.