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首页> 外文期刊>New Journal of Chemistry >Coordination properties of glycylglycine to Cu~+,Ni~+ and Co~+.Influence of metal cation electronic configuration
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Coordination properties of glycylglycine to Cu~+,Ni~+ and Co~+.Influence of metal cation electronic configuration

机译:甘氨酰甘氨酸对Cu〜+,Ni〜+和Co〜+的配位性能。金属阳离子电子构型的影响

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摘要

The structure,vibrational frequencies and binding energies of the complexes formed by the interaction of Cu~+(d~(10),~1S),Ni~+(d~9,~2D) and Co~+(d~8,~3F and ~1G) with glycylglycine have been theoretically determined.The most stable structure of Cu~+-glycylglycine is bicoordinated with the Cu~+ cation interacting with the terminal carbonyl oxygen and the amino group.However,for Ni~+-glycylglycine and Co~+-glycylglycine the lowest energy structures are tricoordinated,the interaction of the metal cation given by the same groups of Cu~+-glycylglycine plus the nitrogen or oxygen atoms of the peptide bond.As for glycine,D_e values follow the order Ni~+ > Co~+ (triplet) approx Cu~+,but the interaction energies are about 11-13 kcal mol~(-1) larger.Differences on the coordination properties of the metal cations are discussed and interpreted according to their electronic structure.
机译:Cu〜+(d〜(10),〜1S),Ni〜+(d〜9,〜2D)和Co〜+(d〜8,)相互作用形成的配合物的结构,振动频率和结合能。从理论上确定了使用甘氨酰甘氨酸的〜3F和〜1G).Cu〜+-甘氨酰甘氨酸最稳定的结构是双配位的,Cu〜+阳离子与末端羰基氧和氨基相互作用。最低能级结构与Co〜+-甘氨酰甘氨酸的结构是三配位的,由相同的Cu〜+-甘氨酰甘氨酸基团加上肽键的氮或氧原子给出的金属阳离子之间的相互作用。对于甘氨酸,D_e值遵循以下顺序Ni〜+> Co〜+(三重态)约为Cu〜+,但相互作用能大11-13 kcal mol〜(-1)。根据金属阳离子的电子学原理讨论和解释了金属阳离子的配位特性差异结构体。

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