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• W2076990080 abstract "Solid-state NMR experiments, analytical and numerical simulations of solid NMR powder patterns, ab initio self-consistent field and hybrid density functional theory calculations, and single-crystal X-ray diffraction are used to characterize the molecular structure and anisotropic NMR interaction tensors in the bis(pentamethylcyclopentadienyl)aluminum cation, [Cp(2)Al](+). This highly symmetric main group metallocene has a structure analogous to that of ferrocene and the cobaltocenium cation. The single-crystal X-ray diffraction structure is reported for [Cp(2)Al][AlCl(4)]. Solid-state (27)Al[(1)H] magic-angle spinning and static NMR experiments are used to study the aluminum chemical shielding and electric field gradient tensors, revealing axial symmetry in both cases with a large chemical shielding span of Omega = 83(3) ppm and a small nuclear quadrupole coupling constant, C(Q)((27)Al) = 0.86(10) MHz. Carbon-13 CPMAS NMR experiments in combination with ab initio calculations and simulations of the effects of chemical exchange on (13)C static powder patterns reveal dynamic rotation of rings and suggest a low internal rotational barrier for this process. Theoretical computations of interaction tensors using the Gaussian 98 and Amsterdam Density Functional software packages are in good agreement with experiment and lend insight into the molecular origin of these NMR interactions. Orientations of the NMR tensors determined from theory, the large chemical shielding span, and the very small value of C(Q)((27)Al) can all be rationalized in terms of the high molecular symmetry." @default.
• W2076990080 created "2016-06-24" @default.
• W2076990080 creator A5026339365 @default.
• W2076990080 creator A5048925953 @default.
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• W2076990080 creator A5073090269 @default.
• W2076990080 date "2002-10-11" @default.
• W2076990080 modified "2023-10-18" @default.
• W2076990080 title "Anisotropic NMR Interaction Tensors in the Decamethylaluminocenium Cation" @default.
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• W2076990080 doi "https://doi.org/10.1021/ja020394p" @default.
• W2076990080 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12405849" @default.
• W2076990080 hasPublicationYear "2002" @default.
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