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D2 ligands differ significantly from classical deuteride ligands in their deuterium quadrupole coupling constants (DQCCs), which were derived from 2H-T1 min measurements on polydeuteride complexes such as [pp3MD2] and [pp3MD(D2)]+ (M = Ru, Os; pp3 = P(CH2CH2PPh2)3). The DQCC of the D2 ligand is much lower than that of the classical deuteride ligand (DQCC values given in kHz below structures in picture).
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Bakhmutov et al. (1999) studied this question.
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