Four Ag-based coordination polymers [Ag(Bim)] (1), [Ag2(NIPH)(HBim)] (2), [Ag6(4-NPTA)(Bim)4] (3) and [Ag2(3-NPTA)(bipy)0.5(H2O)] (4) (HBim = 1H-benzimidazole, bipy = 4,4′-bipyridyl, H2NIPH = 5-nitroisophthalic acid, H2NPTA = 3-/4-nitrophthalic acid) have been synthesized by hydrothermal reaction of Ag(I) salts with N-/O-donor ligands. Single-crystal X-ray diffraction indicated that these coordination polymers constructed from mononuclear or polynuclear silver building blocks exhibit three typical structure features from 1-D to 3-D frameworks. These compounds favour a slow release of Ag+ ions leading to excellent and long-term antimicrobial activities, which is distinguished by their different topological structures, towards both Gram-negative bacteria, Escherichia coli (E. coli) and Gram-positive bacteria, Staphylococcus aureus (S. aureus). In addition, these compounds show good thermal stability and light stability under UV-vis and visible light, which are important characteristics for their further application in antibacterial agents.
四种基于
银的配位聚合物[Ag(Bim)] (1)、[Ag2(NIPH)(HBim)] (2)、[Ag6(4-N
PTA)(Bim)4] (3)和[Ag2(3-N
PTA)(bipy)0.5(
H2O)] (4)(HBim = 1H-
苯并咪唑,bipy = 4,4′-联
吡啶, IPH = 5-硝基
间苯二甲酸,
H2NPTA = 3-/
4-硝基邻苯二甲酸)是通过
银(I)盐与N-/O-供体
配体的
水热反应合成的。单晶X射线衍射表明,这些由单核或多核
银构建的配位聚合物具有从1-D到3-D框架的三个典型结构特征。这些化合物有利于Ag+离子的缓慢释放,从而对革兰氏阴性细菌大肠杆菌(E. coli)和革兰氏阳性细菌
金黄色葡萄球菌(S. aureus)表现出优异的长期抗菌活性,这是由它们不同的拓扑结构决定的。此外,这些化合物在紫外可见光和可见光下具有良好的热稳定性和光稳定性,这是它们进一步应用于抗菌剂的重要特征。