Monocationic gold(iii) Gly-l-His and l-Ala-l-His dipeptide complexes: crystal structures arising from solvent free and solvent-containing crystal formation and structural modifications tuned by counter-anions
作者:Urszula Rychlewska、Beata Warżajtis、Biljana Đ. Glišić、Marija D. Živković、Snežana Rajković、Miloš I. Djuran
DOI:10.1039/c0dt00163e
日期:——
Monocationic gold(III) complexes with histidine-containing peptides, glycyl-L-histidine (Gly-L-His) and L-alanyl-L-histidine (L-Ala-L-His) have been synthesized and characterized by 1H NMR spectroscopy and X-ray crystallography. The crystallized Au(III) complexes, [Au(Gly-L-His-N,N′,N′′)Cl]NO3·1.25H2O and [Au(L-Ala-L-His-N,N′,N′′)Cl]NO3·2.5H2O, were obtained from water solution at pH < 1.0. The chemical shifts in the 1H NMR spectra of [Au(Gly-L-His-N,N′,N′′)Cl]NO3·1.25H2O and [Au(L-Ala-L-His-N,N′,N′′)Cl]NO3·2.5H2O complexes were compared with those for the corresponding Pd(II) complexes and for Pd(II) and Au(III) complexes with Gly-Gly-L-His tripeptide. Crystal data for the hydrated [Au(Gly-L-His-N,N′,N′′)Cl]NO3·1.25H2O complex and its serendipitously obtained unhydrated form were compared with previously reported X-ray data for the hydrated chloride complex [Au(Gly-L-His-N,N′,N′′)Cl]Cl·3H2O and with the analogous, though uncharged, Pd(II) and Pt(II) complexes. Furthermore, in the present study the crystal structure of the nitrate salt of Au(III) complex with L-Ala-L-His dipeptide, [Au(L-Ala-L-His-N,N′,N′′)Cl]NO3·2.5H2O has been determined.
我们合成了含组氨酸肽甘氨酰-L-组氨酸(Gly-L-His)和丙氨酰-L-组氨酸(L-Ala-L-His)的单配位金(III)配合物,并利用 1H NMR 光谱和 X 射线晶体学对其进行了表征。从 pH < 1.0 的水溶液中获得了结晶的 Au(III)配合物 [Au(Gly-L-His-N,N′,N′′)Cl]NO3-1.25H2O 和 [Au(L-Ala-L-His-N,N′,N′′)Cl]NO3-2.5H2O。比较了[Au(Gly-L-His-N,N′,N′′)Cl]NO3-1.25H2O 和[Au(L-Ala-L-His-N,N′,N′′)Cl]NO3-2.5H2O 复合物在 1H NMR 光谱中的化学位移。5H2O 复合物与相应的钯(II)复合物以及钯(II)和金(III)与 Gly-Gly-L-His 三肽的复合物进行了比较。水合[Au(Gly-L-His-N,N′,N′′)Cl]NO3-1.25H2O 复合物及其偶然获得的未水合形式的 X 射线数据,与之前报道的水合氯化物复合物 [Au(Gly-L-His-N,N′,N′′)Cl]Cl-3H2O,以及类似的(尽管不带电)钯(II)和铂(II)复合物的 X 射线数据进行了比较。此外,本研究还测定了 Au(III) 与 L-Ala-L-His 二肽的硝酸盐复合物 [Au(L-Ala-L-His-N,N′,N′′)Cl]NO3-2.5H2O的晶体结构。