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Incorporation of zwitterionic push-pull chromophores into hybrid organic-inorganic matrixes

Innocenzi, Plinio and Miorin, Enrico and Brusatin, Giovanna and Abbotto, Alessandro and Beverina, Luca and Pagani, Giorgio A. and Casalboni, Mauro and Sarcinelli, Felice and Pizzoferrato, Roberto (2002) Incorporation of zwitterionic push-pull chromophores into hybrid organic-inorganic matrixes. Chemistry of materials, Vol. 14 (9), p. 3758-3766. eISSN 1520-5002. Article.

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DOI: 10.1021/cm011231n


Dihydroxy-functionalized zwitterionic push-pull chromophores have been synthesized and incorporated into 3-glycidoxypropyltrimethoxysilane- and N-[(3-trimethoxysilyl)propyl]- ethylenediamine-derived hybrid materials. The functionalization allowed the dye to form covalent bonds to the matrix network, reaching up to 5% molar concentration without aggregation. The host hybrid material was also specifically designed to reduce photobleaching of the dye and to avoid the protonation of the carbanionic species that occurs in acidic media. The host material exhibits very good film-forming properties, and thick highly transparent doped layers can be fabricated via dip-coating. Upon incorporation into the matrix, the dye exhibits a reduction of photobleaching due to the scavenger effect of the amine groups. The strong negative solvatochromism exhibited by this class of chromophores was used to probe the physical-chemical environment within the pores. Dye-functionalized hybrid sol-gel materials were submitted to poling experiments, and the second harmonic signal was measured. Good temporal stability of the NLO materials (retention of ca. 85% of the initial signal value) was recorded after 3 months, providing a d33 value equal to 0.66 pm/V. This system represents one of the few examples of the successful incorporation of zwitterionic push-pull chromophores in sol-gel materials.

Item Type:Article
ID Code:1308
Uncontrolled Keywords:Zwitterionic push-pull chromophores, sol-gel materials, hybrid organic−inorganic matrixes
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione
Publisher:American Chemical Society
Deposited On:18 Aug 2009 10:04

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