Accession Number:

ADP013616

Title:

Nitric Oxide Sensors Obtained Through the Entrapment of Iron Complexes in Sol-Gel Matrix

Descriptive Note:

Conference paper

Corporate Author:

UNIVERSIDADE FEDERAL DE RIBEIRAO PRETO (BRAZIL) DEPT DE FISICA E MATEMATICA

Report Date:

2002-04-05

Pagination or Media Count:

7.0

Abstract:

IronIII-diethyldithiocarbamate Fe3DETC or ironIII-tetra-pentafluorophenyl porphyrin FeTFPP was entrapped within a silica matrix by the sol-gel process. The obtained sol-gel materials SGFeDETC and SGFeTFPP were investigated as sensors for nitric oxide NO. UVVis spectra of the SGFeTFPP present a Soret band at 410 nm similar to that found in the solution. The binding of gaseous NO resulted in a red shift in the Soret absorption band 410 to 419 nm of the FeTFPP in the matrix unlike FeTFPPNO in solution. In the case of SGFeDETC, after addition of sodium dithionite solution and bubbling NO we have good evidence that the complex is formed. The EPR spectrum of the SGFeDETCNO in solid form exhibited a signal similar to that found in a solution of FeDETCNO at 77K. The UVVis spectrum of SGFeDETCNO shows a band at 367 nm also found in FeDETCNO solutions. It is observed that the FeDETCNO is more stable entrapped in the sol-gel than in aqueous solution. In the former the EPR signal decreases by a factor of 4 after one week, in the latter in 2 days the EPR signal cannot be observed anymore.

Subject Categories:

  • Organic Chemistry
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE