Reaction Mechanism for the Hydrolysis of Titanium Alkoxide
- Title
- Reaction Mechanism for the Hydrolysis of Titanium Alkoxide
- Author
- 김호건
- Keywords
- Associative mechanism; Guggenheim method; Bimolecular reaction; Titanium tetra ethoxide
- Issue Date
- 2003-05
- Publisher
- KOREAN CHEMICAL SOC(대한화학회)
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY(대한화학회), v. 24, issue. 5, page. 671-673
- Abstract
- Metal alkoxides have strong reacitivities due to the
difference of polarizabilities between metal and alkoxy
groups. Hence, many kinds of metal alkoxides can be
hydrolyzed with ease and transformed to metal oxide
powder via a condensation-polymerization reaction of the
hydrolyzed species. The hydrolysis reaction mechanisms of
the metal alkoxides depend on the electron affinities, sizes
and charges of metal ions and alkoxy groups.1-3 In the case
of alkoxides that have the same metal ions, the sizes and
numbers of alkoxy groups play an important role in the
hydrolysis reaction. Examples are found in silicon alkoxide
where the reaction rates of hydrolysis decrease with
increasing size of the alkoxy groups through steric effects.4,5
Reaction rates or mechanisms of metal alkoxides can be also
changed by the kinds of metal ions. Particularly, the
transition metal ions, which have different oxidation states,
have different electron affinities, sizes and coordination
numbers, so careful investigation of the hydrolysis of
transition metal alkoxides is required.2
The kinetic studies on
the hydrolysis reactions of metal alkoxides, in general, have
been carried out by spectroscopic methods6-8 such as NMR,
Raman, Infrared, UV, etc. Extensive kinetic data for the
silicon alkoxides9,10 have been obtained by the above
methods, but very few kinetic results for the transition metal
alkoxides have been reported.
In this study, the hydrolysis reaction rate and mechanism
of the titanium tetra ethoxide (Ti(OC2H5)4) were investigated
by the use of the UV spectroscopic method and the results
were compared with those of the other titanium alkoxides
reported in our previous works.
- URI
- http://koreascience.or.kr/article/JAKO200302727204231.pagehttps://repository.hanyang.ac.kr/handle/20.500.11754/155743
- ISSN
- 0253-2964
- DOI
- 10.5012/bkcs.2003.24.5.671
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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