Bulletin of the Korean Chemical Society

  • 제20권12호
  • /
  • Pages.1394-1398
  • /
  • 1999
  • /
  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
권호 표지
DOI QR코드

DOI QR Code

Structural Investigation of the Hydrolysis-Condensation Process of Modified Titanium Isopropoxide

  • 발행 : 1999.12.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The structures of modified Ti$(OPr^i)_4$ with chelating ligands (L) such as ethylacetoacetate (Etac), acetylacetone (Acac) and methylacetoacetate (Mtac) were identified by using IR, ¹H NMR and $^13C$ NMR spectroscopies, and the octahedral structure was confirmed after modification. The pre-edge peaks of XANES spectra of modified metal alkoxides also denoted the mixture of five-fold and six-fold structures. The EXAFS fitting results showed the local structure around Ti atom after alkoxide modification. The hydrolysis-condensation rates of modified Ti alkoxide with organic additives were investigated by ¹H NMR spectroscopy. The Ti$(OPr^i)_4$ modified by Acac was less reactive toward hydrolysis-condensation reaction than those modified by the other alkoxides, which can be attributed to the stable ligand structure between Ti$(OPr^i)_4$ and Acac. The small particle size of modified Ti$(OPr^i)_4$ sol was obtained when Acac was employed.

키워드

참고문헌

  1. Sol-Gel Sci. & Tech. v.3 Bonhomme-Coury, L.;Babonnearu, F.;Livage, J. J.
  2. Non-Crystalline Solids v.121 Nass, R.;Schmidt, J. H.
  3. Sol-Gel Sci. & Tech. v.8 Shul, Y. G.;Oh, K. S.;Yang, J. C.;Jung, J. K. T.
  4. Catal. Lett. v.36 Yang, J. C.;Shul, Y. G.
  5. Metal Alkoxides Bradley, D. C.;Mehrotra, R. C.;Gaur, D. P.
  6. Ultrastructure Process of Advanced Materials Livage, J.;Henry, M.;Mackenzie, J.(et al.)(Eds.)
  7. Sol-Gel Sci. & Tech. v.5 Sedlar, M.;Sayer, J. M.
  8. Non-Crystalline Solids v.121 Babonneau, F.;Coury, L.;Livage, J. J.