Development of a dissolved oxygen sensor using tris(bipyridyl) ruthenium (II) complexes entrapped in highly siliceous zeolites
✍ Scribed by Pramatha Payra; Prabir K. Dutta
- Book ID
- 104055085
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 486 KB
- Volume
- 64
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
Defect-free highly siliceous zeolites were prepared by dealumination of zeolite Y using silicon tetrachloride. Tris(bipyridyl) ruthenium (II) complex, [Ru(bpy) 3 ] 2þ , was synthesized inside the supercages of the highly siliceous faujasitic zeolites using neutral Ru(bpy)Cl 3 as the starting material. The conventional procedure using ion-exchange of hexammine ruthenium could not be used because of the lack of ion-exchange sites in the siliceous zeolites. The emission quenching of intrazeolitic Ru(bpy) 2þ
3 by oxygen dissolved in water was studied. Dealumination of the zeolitic framework leads to a hydrophobic environment that promotes oxygen transfer from water to the zeolite. Transparent zeolitedispersed siloxane films were prepared and examined as sensors for dissolved oxygen.