Glyphosate sensing in aqueous solutions by fluorescent zinc(<scp>ii</scp>) complexes of [9]aneN<sub>3</sub>-based receptors
作者:Alessandra Garau、Giacomo Picci、Andrea Bencini、Claudia Caltagirone、Luca Conti、Vito Lippolis、Paola Paoli、Giammarco Maria Romano、Patrizia Rossi、Mariano Andrea Scorciapino
DOI:10.1039/d2dt00738j
日期:——
exogenous anionic substrates. Potentiometric studies evidenced the marked coordination ability of the L2/Zn(II) system for the analytes considered, with a preferential binding affinity for H3PMG over the other substrates, in a wide range of pH values. 1H and 31P NMR experiments supported the effective coordination of such substrates by the Zn(II) complex of L2, while fluorescence titrations and a test
在此,我们描述了 [12]aneN 4 - ( L1 ) 和 [9]aneN 3受体 ( L2 , L3 ) 的 Zn( II ) 配合物对除草剂N -(膦酰甲基)甘氨酸(草甘膦,H 3 )的结合能力PMG)和2-氨基-4-[羟基(甲基)磷酰基]丁酸(草铵膦,H 2 GLU),以及氨甲基膦酸(H 2 AMPA),H 3 PMG的主要代谢物和磷酸盐。所有配体形成稳定的 Zn( II ) 配合物,其配位几何形状允许金属中心与外源阴离子底物发生可能的相互作用。电位研究证明L2 /Zn( II ) 系统对所考虑的分析物具有显着的协调能力,在较宽的 pH 值范围内,与其他底物相比,对 H 3 PMG 具有优先的结合亲和力。 1 H和31 P NMR实验支持L2的Zn( II )络合物对此类底物的有效配位,同时进行荧光滴定和测试条实验以评估H 3 PMG识别过程是否可以通过荧光信号检测。
Structural Basis for Bifunctional Zinc(II) Macrocyclic Complex Recognition of Thymine Bulges in DNA
作者:Imee Marie A. del Mundo、Kevin E. Siters、Matthew A. Fountain、Janet R. Morrow
DOI:10.1021/ic3004245
日期:2012.5.7
10-tetraazacyclododecane (cy4q) binds selectively to thymine bulges in DNA and to a uracil bulge in RNA. Binding constants are in the low-micromolar range for thymine bulges in the stems of hairpins, for a thymine bulge in a DNA duplex, and for a uracil bulge in an RNA hairpin. Binding studies of Zn(cy4q) to a series of hairpins containing thymine bulges with different flanking bases showed that the complex