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Identifier 000361996
Title Δενδριμερή με οργανομεταλλικές χρωμοφόρες ομάδες εγγύς υπέρυθρου
Alternative Title Dendrimers containing organometallic near infrared chromophores
Author Γεωργακόπουλος, Σπυρίδων Κωνσταντίνου
Thesis advisor Σμόνου, Ιουλία
Abstract The purpose of the work described in this thesis was the synthesis and study of dendrimers which could absorb in the near-infrared region of the electromagnetic spectrum. Such molecules have potential applications in a number of fields, especially those relating to materials and bioactive compounds. During the course of this work, two series of polyarylether dendrimers with organometallic chromophores as cores were synthesized. A convergent route was chosen for the synthesis of the dendrimers, according to which the core and the branch are synthesized along two separate synthetic routes and the dendrimer is obtained by a final coupling reaction between the core and the activated branch. The branches that were chosen are known Fréchet- type polyarylether compounds as well as polyarylether Fréchet- type analogs that contain functional groups which can be used as starting points for the multifunctional modification of the periphery of the dendrimer. The chromophores that were chosen as cores are electron donor – acceptor systems that incorporate the ferrocene moiety, which is connected either through a backbone that allows conjugation (A) or directly (B) to a carbocationic center. Chromophores of this type are expected to exhibit near infrared dye properties. Two series of first and second generation dendrimers were synthesized and characterized mainly by spectroscopic techniques. In particular, extensive use was made of one- and two-dimensional NMR methods in order to confirm the structures of the new compounds. The optical properties of the dendrimers that were synthesized were evaluated by measuring the absorbance of solutions of the dendrimers in dichloromethane in the visible and infrared region of the electromagnetic spectrum. Whereas dendrimers of type A did not demonstrate significant absorption in the near-infrared region that was studied, those of type B exhibited relatively strong absorbtions in the region between 750 – 800 nm in the presence of acid.
Physical description [14], 176 φύλλα : εικ. ; 30 εκ.
Language Greek
Subject Chromophores
Near infrared
Εγγύς υπέρυθρο
Issue date 2010-06-01
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Chemistry--Doctoral theses
  Type of Work--Doctoral theses
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