of a proline derivative 6 bearing a chiral center in the N-amido moiety provide direct evidence for this conformation change upon its binding with anions in MeCN. The amplified effect of substituent X at the N′-phenyl ring of 5 on the anion binding constant supports the conclusion of anion-binding switched charge transfer in the anion binding complex. 1H NMR and absorption titrations for 5 indicated
N-(乙酰氨基)-N'-苯硫脲(4–6)被发现是有效的阴离子受体,其阴离子亲和力比它们的阴离子亲和力高N-苯甲酰胺基-N'-苯硫脲对应对象(1和2)。这N'-苯硫脲在4–6中的部分被证明是发色团,其最大吸收在。270纳米 已经发现,在阴离子的存在下,在约1μm的吸收。270 nm的4–6(5f除外)in乙腈(MeCN)呈蓝色偏移并增强,而大约在2020年出现红移的肩膀。295 nm,以及大约等渗点。240纳米 1:1的阴离子结合的常数4-6在10,例如6 -10 7中号-1数量级为ACO -在MeCN,被认为是比那些更高1和2,虽然硫脲基的酸度4–6中的-NH质子低于1和2中的-NH质子。1 H NMR数据表明4–6中的N–N单键是扭曲的,但小于1中的N–N单键。和2。建议在阴离子结合后在4–6的N–N单键处发生构象变化,这导致阴离子结合复合物中的平面氢键网络发生电荷转移,其中N-酰基部分
Antimicrobial and Physicochemical Characterizations of Thiosemicarbazide and <i>S</i>-Triazole Derivatives
GRAPHICAL ABSTRACT Abstract Two series of thiosemicarbazide derivatives and three series of s-triazolederivatives have been synthesized. All of these compounds were tested for their in vitro antibacterial activity against Gram-positive and Gram-negative bacterial strains. Among tested thiosemicarbazide derivatives, the best bioactivity was detected for two 1-formylthiosemicarbazides with 3-/4-tolyl