Universität Tübingen
Binuclear Phthalocyanines: synthesis, characterisation and optical limiting properties
Abstract
One objective of this work is the synthesis and full characterization of binuclear metal phthalocyanines 12-15 containing the same metal or different metals e. g. Ni and Cu in the same molecule (14 and 15), as well as to obtain unsymmetrically substituted binuclear PcM's 12 and 14. Compounds 12 and 13 were synthesized with Ni as central metal in both cavities. Copper and nickel where found to be convenient for the purpose, since both have good chelating and stabilizing properties for the formed phthalocyanines. Other accomplished objective is the design of binuclear metal phthalocyanines in order to achieve effective optical limiting materials, namely with In (22) or Ga (23) as central metals, using the same approach as described for the synthesis of Ni/Ni and Ni/Cu binuclear Pc's. Octasubstituted phthalocyanines with electron donating substituents and GaCl and InCl as central moieties for optical limiting purposes are also synthesized, in order to compare with the "state of art" molecule (tBu4)PcInCl. Due to the synthetic difficulties, the last element of this group, namely Thallium (Tl) has not been studied so far, except in one case. For the first time we synthesized an octaalkoxy substituted thallium–Pc–compound, namely (RO)8PcTlX with R = 2-ethylhexyl and X = OCOCF3 (28), as well as (RO)8PcInCl (26) and (RO)8PcGaCl (27). The optical limiting (OL) properties of the In/In binuclear Pc 22 are also studied. The OL effect of 22 in toluene has been studied at the wavelength 532 nm with nanosecond laser pulses by means of the Z-scan technique. Z-scan profiles of 22 in solution have been determined both in the open and closed aperture configurations.
Author and committee
dc:creator, dc:contributor.*- Author
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- Calvete, Mário
Identifiers
dc:identifier.*- Identifier
- hdl:10900/48545