Two-dimensional nutation 59Co NMR of solid Co4(CO)12
Autor: | Hirokazu Nakayama, Brian T. Heaton, Sadamu Takeda, Nobuo Nakamura, Taro Eguchi, H. Ohki, S. Kernaghan |
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Rok vydání: | 1992 |
Předmět: |
chemistry.chemical_classification
Coupling constant media_common.quotation_subject Nutation Organic Chemistry Crystal structure Biochemistry Asymmetry Inorganic Chemistry Crystallography Nuclear magnetic resonance chemistry Quadrupole Materials Chemistry Tetrahedron Physical and Theoretical Chemistry Inorganic compound Electric field gradient media_common |
Zdroj: | Journal of Organometallic Chemistry. 428:207-212 |
ISSN: | 0022-328X |
DOI: | 10.1016/0022-328x(92)83230-f |
Popis: | 59 Co 2D nutation NMR experiments were conducted at 47.485 MHz in order to determine the quadrupole coupling constants ( e 2 Qq/h ) of 59 Co nuclei in solid Co 4 (CO) 12 . The 2D spectrum observed clearly indicates the presence of two inequivalent 59 Co nuclei, Co(apical) and Co(basal). The magnitude of e 2 Qq/h and the asymmetry parameter of the electric field gradient, η, were determined to be 9 ± 2 MHz and 0 for Co(basal), and 15 ± 3 MHz and 0.8 for Co(apical). The large value of η for Co(apical) suggests that the apical Co occupies the site on a pseudo-C 3 axis in the crystalline lattice. These facts are consistent with our previous proposal that a symmetry conserved reorientation of the Co 4 -tetrahedron occurs in the solid state. |
Databáze: | OpenAIRE |
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