Copper complexes with dissymmetrically substituted bis(thiosemicarbazone) ligands as a basis for PET radiopharmaceuticals: control of redox potential and lipophilicity
作者:Oliver C. Brown、Julia Baguña Torres、Katherine B. Holt、Philip J. Blower、Michael J. Went
DOI:10.1039/c7dt02008b
日期:——
synthesis of a library of new dissymmetrically substituted bis(thiosemicarbazone) ligands by controlling the condensation reactions between dicarbonyl compounds and 4-substituted-3-thiosemicarbazides or using acetal protection. Copper complexes of the new ligands have been prepared by reaction with copper acetate or via transmetallation of the corresponding zinc complexes, which are convenient precursors for
other. The complexes undergo Ru(II)/Ru(III) oxidation at a relatively low potential of 0.05–0.12 V versus Ag/AgCl. One of the Ru(II) complex has been chemically oxidized to the corresponding Ru(III) complex [Ru(PPh3)2(L)]PF6 using ferrocenium hexafluorophosphate as an oxidizing agent. E.P.R. spectra of the Ru(III) complex and DFT calculations on the Ru(III) as well as two of the Ru(II) complexes suggest
Binuclear and tetranuclear Zn(<scp>ii</scp>) complexes with thiosemicarbazones: synthesis, X-ray crystal structures, ATP-sensing, DNA-binding, phosphatase activity and theoretical calculations
作者:Piyali Adak、Bipinbihari Ghosh、Antonio Bauzá、Antonio Frontera、Steven R. Herron、Shyamal Kumar Chattopadhyay
DOI:10.1039/c9ra10549b
日期:——
Two Zinc(II) complexes [Zn4(L1)4]·2H2O (1) and [Zn2(L2)2]·2H2O (2) of pyruvaldehydethiosemicarbazone ligands are reported. The complexes were characterized by elemental analysis, IR, NMR, UV-vis spectroscopy and by single-crystal X-ray crystallography. X-raycrystalstructure determinations of the complexes show that though Zn : ligand stoichiometry is 1 : 1 in both the complexes, the molecular unit
报道了丙酮醛缩氨基硫脲配体的两种Zinc( II )配合物[Zn 4 (L 1 ) 4 ]·2H 2 O ( 1 )和[Zn 2 (L 2 ) 2 ]·2H 2 O ( 2 )。通过元素分析、IR、NMR、UV-vis 光谱和单晶 X 射线晶体学对配合物进行表征。配合物的 X 射线晶体结构测定表明,尽管两种配合物中 Zn:配体化学计量比为 1:1,但分子单元为1为四核,2为双核. 这两种配合物在其他阴离子如 AcO -、NO 3 -、F -、Cl -的存在下,在 CH 3 CN-H 2 O (9 : 1) 介质中,在 pH 7.4 (0.01 M HEPES) 下显示出对 ATP 的选择性感应, H 2 PO 4 -、HPO 4 2-和 P 2 O 7 2-。复合物1和2与 ATP的紫外滴定实验导致结合常数为 2.0(±0.07) × 10 4 M -1和 7.1(±0.05) × 10 3