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The full chemical shielding tensors have been measured for COO in a single crystal of (D)-ammonium tartrate.The l3C nucleus is most shielded when Ho is perpendicular to the l3COO-plane and least shielded 13 _ . .13 when Ho is in the COO plane bisecting the two c-o bonds.The average values of the shielding elements are 0'11 = -109, 0'22 = -61, 0'33 = 23 (±6)in ppm relative to an external reference of liquid benzene.
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Chang et al. (1974) studied this question.
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