Tajmir-Riahi H A
Biophys Chem. 1986 Nov;25(1):37-41. doi: 10.1016/0301-4622(86)85065-7.
Interaction between [Co(NH3)5Cl]Cl2, [Co(NH3)4Cl2]Cl and L-ascorbic acid has been investigated in aqueous solution and solid complexes of the type [Co(NH3)5 ascorbate]Cl2 X H2O and [Co(NH3)4 ascorbate]Cl2 X H2O have been isolated and characterized by 13C-NMR, FT-IR and electron absorption spectroscopy. Spectroscopic and other evidence suggested that the sugar anion binds monodentately in the [Co(NH3)5 ascorbate]2+ cation via the ionized O3 oxygen atom and bidentately in [Co(NH3)4 ascorbate]2+ through the O1 and O4 oxygen atoms, resulting in a six-coordinate geometry around the Co(III) ion. The intermolecular sugar hydrogen-bonding network is perturbed upon sugar metalation and the sugar moiety shows a similar conformation to that of the sodium ascorbate compound in these series of cobalt-ammine complexes.
已在水溶液中研究了[Co(NH₃)₅Cl]Cl₂、[Co(NH₃)₄Cl₂]Cl与L-抗坏血酸之间的相互作用，并分离出了[Co(NH₃)₅抗坏血酸盐]Cl₂·XH₂O和[Co(NH₃)₄抗坏血酸盐]Cl₂·XH₂O类型的固体配合物，并用¹³C-NMR、傅里叶变换红外光谱和电子吸收光谱对其进行了表征。光谱学及其他证据表明，糖阴离子在[Co(NH₃)₅抗坏血酸盐]²⁺阳离子中通过电离的O3氧原子单齿配位，而在[Co(NH₃)₄抗坏血酸盐]²⁺中通过O1和O4氧原子双齿配位，从而在Co(III)离子周围形成六配位几何结构。在糖金属化时，分子间糖氢键网络受到干扰，并且在这一系列钴氨配合物中，糖部分呈现出与抗坏血酸钠化合物相似的构象。
