Chemical formation of mononuclear univalent zinc in a microporous crystalline silicoaluminophosphate

被引:54
作者
Tian, Y [1 ]
Li, GD [1 ]
Chen, JS [1 ]
机构
[1] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130023, Peoples R China
关键词
D O I
10.1021/ja0343757
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A host-guest compound containing mononuclear univalent Zn+ ions has been prepared through vapor reaction of metallic zinc with protons in the cages of SAPO-CHA, a silicoaluminophosphate molecular sieve. Unlike in fused ZnCl2 salt, the formed Zn+ species are associated with the molecular sieve walls, and this prevents the cations from getting paired to form diamagnetic (Zn-Zn)2+. Electron spin resonance spectroscopy reveals the paramagnetic nature of the Zn+ species which display anisotropic g factors, and the two crystallographically independent Zn+ sites are distinguishable from the ESR signals. The magnetic moments of the univalent zinc in SAPO-CHA interact antiferromagnetically at low temperatures with a Néel point of about 4 K as observed from the temperature dependence plot of the magnetic susceptibility of the host-guest compound. Copyright © 2003 American Chemical Society.
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页码:6622 / 6623
页数:2
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