Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)
- Volume 1 Issue 2
- /
- Pages.126-140
- /
- 1997
- /
- 1226-6531(pISSN)
Cupric Ion Species in Cu(II)-Exchanged Mesoporous MCM-41 Gallosilicate Determined by Electron Spin Resonance Studies
- Kim, Jeong-Yeon (Department of Chemistry, Hannam University) ;
- Yu, Jong-Sung (Department of Chemistry, Hannam University)
- Published : 1997.12.01
Abstract
Mesoporous MCM-41 gallosilicate material was synthesized through shifting through shifting gallosilicate polymer equilibrium towards a MCM-41 phase by addition of acid. The location of Cu(II) exchanged into MCM-41 and its interaction with various adsorbate molecules were investigated by electron spin responance and electron spin echo modulation spectroscopies. It was found that in the fresh hydrated material, Cu(II) is octahedrally coordinated to six water molecules. This species is located in a cylindrical channel and rotates rapidly at room temperature. Evacuation at room temperature removes three of these water molecules, leaving the Cu (II) coordinated to three water molecules and anchored to oxygens in the channel wall. Dehydration at 45
Keywords