Acta Chimica Sinica ›› 2001, Vol. 59 ›› Issue (2): 253-256.

Original Articles

### ^1^1^3Cd MAS NMR谱表征纳米CdO， CdS在NaY的β笼内 形成的构型

1. 复旦大学分析测试中心.上海(200433);复旦大学化学系.上海(200433)
• 发布日期:2001-02-15

### Characterization of configuration of CdO, CdS in Nay β- cage by using ^1^1^3Cd MAS NMR

Zhang Yongchao;Qi Ming;Xue Zhiyuan;Li Quanzhi

1. Fudan Univ, Ctr Anal & Measurement.Shanghai(200433);Fudan Univ, Dept Chem.Shanghai(200433)
• Published:2001-02-15

The geometry structure of the guest clusters Cd(OH)^+, CdO and CdS located at βcage of Y zeolite was investigated by ^1^1^3Cd MAS NMR . The results show that there is a chemical shift at 115.0, 114.4 and 100.0 in the 113^Cd MAS NMR spectrum of CdO-NaY, CdS10-NaY and CdS20- NaY(sulphuration time for CdO-NaY is 10 min, 20 min respectively), respectively. These chemical shift values are close to the value of 83.5 which is the resonance signal of cubic halite type of bulk CdO with coordination number of 6, and deviate from the value of 583.8 which is the 113^Cd chemical shift of cubic sphalerite of bulk CdS with coordination number of 4. These results illustrate that the corrdination environment of the Cd^2+ ions located at βcage of Y zeolite is similar to that of bulk CdO with the cubic halite structure. It is also noted that the chemical shift value for CdO-NaY sample decreases with the increase of sulphuration time due to the oxygen atom with larger electronegativity being gradually substituted by sulphur atom. The phenomenon is identical with that substitute of selenium for sulphur of CdS or tellurium for selenium of CdSe. In addition, the 29^Si and 27^Al MAS NMR results show that several aluminum ions were removed from framework of zeolite NaY in the period of preparation of guest cluster with ion exchange and sulfidation treatment bringing about the formation of framework defect position. It is of benefit to sulfur atoms with larger atomic diameter from α cage smoothly into βcage of Y zeolite and sulfate the CdO or Cd(OH)^+ clusters to Cd(O,S) clusters.

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