31 P MAS NMR investigation of some microporous zincophosphates
Апстракт
High field magic-angle spinning (MAS) 31 P-NMR investigations of novel porous zincophosphates and their cobalt-containing derivatives confirm the framework structure of alternating Zn(Co)O 4 and PO 4 tetrahedra. The MAS NMR spectrum of cobalt-containing products exhibits a large anisotropy manifested in numerous side bands. This effect is attributed to paramagnetic shifts induced by dipolar interactions between the unpaired electrons of Co 2+ and the 31 P nuclei. The relative intensity of the side bands is significantly lower in the cobalt-exchanged sample (where the Co 2+ does not occupy framework sites) than in the cobalt-containing zincophosphates. This shows that 31 P-NMR measurements can give direct evidence of extra-framework cobalt(II) or of Co(II) incorporation in the zincophosphate lattice.
Кључне речи:
31 P-NMR investigation molecular sieve / Cobalt(II) derivatives / Zeolitelike materials / Zinc phosphatesИзвор:
Journal of the Serbian Chemical Society, 1996, 61, 2, 107-111Издавач:
- Serbian Chemical Society, Belgrade
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Rajić, Nevenka AU - Stojaković, O. PY - 1996 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/71 AB - High field magic-angle spinning (MAS) 31 P-NMR investigations of novel porous zincophosphates and their cobalt-containing derivatives confirm the framework structure of alternating Zn(Co)O 4 and PO 4 tetrahedra. The MAS NMR spectrum of cobalt-containing products exhibits a large anisotropy manifested in numerous side bands. This effect is attributed to paramagnetic shifts induced by dipolar interactions between the unpaired electrons of Co 2+ and the 31 P nuclei. The relative intensity of the side bands is significantly lower in the cobalt-exchanged sample (where the Co 2+ does not occupy framework sites) than in the cobalt-containing zincophosphates. This shows that 31 P-NMR measurements can give direct evidence of extra-framework cobalt(II) or of Co(II) incorporation in the zincophosphate lattice. PB - Serbian Chemical Society, Belgrade T2 - Journal of the Serbian Chemical Society T1 - 31 P MAS NMR investigation of some microporous zincophosphates EP - 111 IS - 2 SP - 107 VL - 61 UR - https://hdl.handle.net/21.15107/rcub_technorep_71 ER -
@article{ author = "Rajić, Nevenka and Stojaković, O.", year = "1996", abstract = "High field magic-angle spinning (MAS) 31 P-NMR investigations of novel porous zincophosphates and their cobalt-containing derivatives confirm the framework structure of alternating Zn(Co)O 4 and PO 4 tetrahedra. The MAS NMR spectrum of cobalt-containing products exhibits a large anisotropy manifested in numerous side bands. This effect is attributed to paramagnetic shifts induced by dipolar interactions between the unpaired electrons of Co 2+ and the 31 P nuclei. The relative intensity of the side bands is significantly lower in the cobalt-exchanged sample (where the Co 2+ does not occupy framework sites) than in the cobalt-containing zincophosphates. This shows that 31 P-NMR measurements can give direct evidence of extra-framework cobalt(II) or of Co(II) incorporation in the zincophosphate lattice.", publisher = "Serbian Chemical Society, Belgrade", journal = "Journal of the Serbian Chemical Society", title = "31 P MAS NMR investigation of some microporous zincophosphates", pages = "111-107", number = "2", volume = "61", url = "https://hdl.handle.net/21.15107/rcub_technorep_71" }
Rajić, N.,& Stojaković, O.. (1996). 31 P MAS NMR investigation of some microporous zincophosphates. in Journal of the Serbian Chemical Society Serbian Chemical Society, Belgrade., 61(2), 107-111. https://hdl.handle.net/21.15107/rcub_technorep_71
Rajić N, Stojaković O. 31 P MAS NMR investigation of some microporous zincophosphates. in Journal of the Serbian Chemical Society. 1996;61(2):107-111. https://hdl.handle.net/21.15107/rcub_technorep_71 .
Rajić, Nevenka, Stojaković, O., "31 P MAS NMR investigation of some microporous zincophosphates" in Journal of the Serbian Chemical Society, 61, no. 2 (1996):107-111, https://hdl.handle.net/21.15107/rcub_technorep_71 .