Bis 4,5-diazafluoren-9-one silver(i) nitrate: synthesis, X-ray structures, solution chemistry, hydrogel loading, DNA coupling and anti-bacterial screening
作者:Alshima'a A. Massoud、Yousry M. Gohar、Vratislav Langer、Per Lincoln、Frida R. Svensson、Janne Jänis、Sofie T. Gårdebjer、Matti Haukka、Fabian Jonsson、Emma Aneheim、Peter Löwenhielm、Morsy A. M. Abu-Youssef、Lars R. Öhrström
DOI:10.1039/c0nj00697a
日期:——
Synthesis of bis-4,5-diazafluoren-9-one silver(I) nitrate I (dafone = 4,5-diazafluoren-9-one) and the low temperature X-ray single crystal structure of [Ag(4,5-diazafluoren-9-one)2NO3], crystal form 1, and a re-determination of [Ag(4,5-diazafluoren-9-one)2]NO3·H2O, crystal form 2 are presented. Crystal form 1 has a distorted trigonal planar coordination geometry around Ag(I) with an N–Ag–N bond angle of 123.45(7)°. Crystal form 2 has a perfect linear coordination around Ag, with N–Ag–N 180.0°. Compound I was characterized by 1H-NMR, biological activity and ESI-MS in DMSO at room temperature. The biological activity was determined against 6 different resistant clinical isolates; two Gram-positive (Staphylococcus aureus and Streptococcus pyogenes) and four Gram-negative (Pseudomonas aeruginosa, Klebsiella pneumoniae, Proteus mirabilis, and Salmonella sp.) in comparison with 15 known antibiotics used in the treatment of diabetic foot infections. Compound I showed broad spectrum activity against all the test organisms. P. mirabilis and S. aureus and K. pneumoniae were the most sensitive clinical isolates (MIC = 4, 6 and 4 μg ml−1, respectively). Three different hydrogels containing I or Ag2SO4 were prepared and the antimicrobial activity against Ps. aeruginosa (ATCC 15442) compared, showing more or less equal activity on a weight basis, but I seems to have a significant better performance per silver ion. The Ag(I) complex also binds more effectively to calf thymus DNA than the dafone ligand itself.
本文介绍了双-4,5-二氮芴-9-酮硝酸银 I(dafone = 4,5-二氮芴-9-酮)的合成、晶体形式 1 [Ag(4,5-diazafluoren-9-one)2NO3] 的低温 X 射线单晶结构以及晶体形式 2 [Ag(4,5-diazafluoren-9-one)2]NO3-H2O 的重新测定。晶体形式 1 围绕 Ag(I)呈扭曲的三棱平面配位几何形状,N-Ag-N 键角为 123.45(7)°。晶体形式 2 在 Ag 周围具有完美的线性配位,N-Ag-N 为 180.0°。室温下,在 DMSO 中通过 1H-NMR、生物活性和 ESI-MS 对化合物 I 进行了表征。与 15 种已知的治疗糖尿病足感染的抗生素相比,化合物 I 对 6 种不同的耐药性临床分离株(两种革兰氏阳性菌(金黄色葡萄球菌和化脓性链球菌)和四种革兰氏阴性菌(铜绿假单胞菌、肺炎克雷伯氏菌、奇异变形杆菌和沙门氏菌))具有生物活性。化合物 I 对所有试验生物都具有广谱活性。奇异变形杆菌、金黄色葡萄球菌和肺炎双球菌是最敏感的临床分离菌(MIC 分别为 4、6 和 4 μg ml-1)。制备了含有 I 或 Ag2SO4 的三种不同水凝胶,并比较了它们对铜绿假单胞菌(ATCC 15442)的抗菌活性。Ag(I) 复合物与小牛胸腺 DNA 的结合也比达丰配体本身更有效。