Silylated Coumarin Dyes in Sol-Gel Hosts. 2. Photostability and Sol-Gel Processing

T. Suratwala, Z. Gardlund, K. Davidson, Donald R Uhlmann, J. Watson, S. Bonilla, Nasser N Peyghambarian

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

The photostability characteristics of numerous silylated coumarin dyes within SiO2 xerogels and SiO2:PDMS Polyceram films, and of neat silylated coumarin dye films have been determined and related to the sol-gel processing conditions and host composition. FTIR spectroscopy was used to monitor the hydrolysis reaction rates of the silylated dyes and other Si-alkoxide precursors. The silylated dyes had varying reaction rates depending on the degree of functionality and the linkage between the alkoxide and the dye. Matching the reaction rates between TMOS and the silylated dye was accomplished by prehydrolysis of the silylated dye. The photostability of the dyes in the xerogels was measured by monitoring the drop in fluorescence intensity upon pumping with a N2 laser and also by monitoring the drop in dye absorption upon irradiating the films with a UV lamp. At optimized prehydrolysis times, a silylated coumarin dye (derCoum) within a SiO2 xerogel host demonstrated a 3-fold improvement in long-term photostability compared to its unsilylated counterpart. The use of a silylated dye results in covalently bonding the dye to the host matrix, increasing the probability that the dye will be caged and inhibiting dynamic processes which can lead to photodegradation. CP-MAS 29Si NMR data for a derCoum xerogel confirmed that a large degree of dye bonding occurred. The addition of PDMS to the basic SiO2 xerogel host composition had little effect on the photostability of the dye. The neat dye films showed improved fluorescence photostability with increase in hydrolysis time. These films showed poor photostability upon exposure to UV lamp degradation due to lower thermal degradation resistance and/or thermal conductivity compared to the SiO2 xerogel films.

Original languageEnglish (US)
Pages (from-to)199-209
Number of pages11
JournalChemistry of Materials
Volume10
Issue number1
StatePublished - Jan 1998

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Sol-gels
Coloring Agents
Dyes
Processing
Xerogels
Reaction rates
Ultraviolet lamps
coumarin
Hydrolysis
Fluorescence
Pumping (laser)
Monitoring
Photodegradation
Chemical analysis
Thermal conductivity
Pyrolysis
Nuclear magnetic resonance
Spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

Cite this

Silylated Coumarin Dyes in Sol-Gel Hosts. 2. Photostability and Sol-Gel Processing. / Suratwala, T.; Gardlund, Z.; Davidson, K.; Uhlmann, Donald R; Watson, J.; Bonilla, S.; Peyghambarian, Nasser N.

In: Chemistry of Materials, Vol. 10, No. 1, 01.1998, p. 199-209.

Research output: Contribution to journalArticle

Suratwala, T, Gardlund, Z, Davidson, K, Uhlmann, DR, Watson, J, Bonilla, S & Peyghambarian, NN 1998, 'Silylated Coumarin Dyes in Sol-Gel Hosts. 2. Photostability and Sol-Gel Processing', Chemistry of Materials, vol. 10, no. 1, pp. 199-209.
Suratwala T, Gardlund Z, Davidson K, Uhlmann DR, Watson J, Bonilla S et al. Silylated Coumarin Dyes in Sol-Gel Hosts. 2. Photostability and Sol-Gel Processing. Chemistry of Materials. 1998 Jan;10(1):199-209.
Suratwala, T. ; Gardlund, Z. ; Davidson, K. ; Uhlmann, Donald R ; Watson, J. ; Bonilla, S. ; Peyghambarian, Nasser N. / Silylated Coumarin Dyes in Sol-Gel Hosts. 2. Photostability and Sol-Gel Processing. In: Chemistry of Materials. 1998 ; Vol. 10, No. 1. pp. 199-209.
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