Syntheses, Characterization and Antimicrobial Screening of N-(Benzothiazol-2-yl)-2,5-Dichlorobenzenesulphonamide and Its Cu(I), Ni(II), Mn(II), Co(III) and Zn(II) Complexes
作者:L.N. Obasi、C.O.B. Okoye、P.O. Ukoha、K.F. Chah
DOI:10.14233/ajchem.2013.13393
日期:——
N-(Benzothiazol-2-yl)-2,5-dichlorobenzenesulphonamide (DCBS2ABT) was synthesized by the condensation (by refluxing) of 2-aminobenzothiazole and 2,5-dichlorobenzenesulphonylchloride in acetone at 230 ºC. The resulting crude precipitates were recrystallized in absolute ethanol. Five metal complexes of copper(I), nickel(II), manganese(II), cobalt(III) and zinc(II) of the ligand were synthesized. The compounds were characterized using magnetic susceptibility measurements, UV/visible spectrophotometry, elemental microanalysis, infrared, 1H and 13C NMR spectroscopies. The antimicrobial tests of the ligands and its metal complexes were carried out on both multi-resistant bacterial strains isolated under clinical conditions and cultured species using agar-well diffusion method. The multi-resistant bacterial strains used were Escherichia coli, Proteus species, Pseudomonas aeroginosa and Staphylococcus aureus were isolated from dogs. The culture species were Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922) Staphylococcus aureus (ATCC 25923) and the fungi, Candida krusei (ATCC 6258) and Candida albicans (ATCC 90028). The tests were performed both in vitro and in vivo. Thus the inhibition zone diameter, the minimum inhibitory concentration and the lethal and effective concentrations (LC50 and EC50) were determined. The antimicrobial activities of the compounds were compared with those of ciprofloxacin and trimethoprim-sulphamethoxazole as antibacterial agents and fluconazole as an antifungal drug. All the compounds showed varying activities against the cultured typed bacteria and fungi used. However, they were less active than the standard drugs used except fluconazole, which did not show any activity against Candida krusei (ATCC 6258) but the ligand, DCBS2ABT and all the metal complexes synthesized were very active against it. The lethal concentration (LC50) ranged from 81.00 ± 6.8-256.30 ± 36.7 ppm. These are within the permissible concentrations.
N-(苯并噻唑-2-基)-2,5-二氯苯磺酰胺(DCBS2ABT)是通过2-氨基苯并噻唑和2,5-二氯苯磺酰氯在丙酮中于230 ℃下缩合(回流)合成的。将所得粗沉淀物在无水乙醇中重结晶。合成了配体的铜(I)、镍(II)、锰(II)、钴(III)和锌(II)五种金属配合物。使用磁化率测量、紫外/可见分光光度法、元素微量分析、红外、1H 和 13C NMR 光谱对这些化合物进行了表征。采用琼脂孔扩散法对临床分离的多重耐药菌株和培养菌种进行了配体及其金属配合物的抗菌试验。使用的多重耐药菌株是从狗身上分离出的大肠杆菌、变形杆菌、铜绿假单胞菌和金黄色葡萄球菌。培养物包括铜绿假单胞菌 (ATCC 27853)、大肠杆菌 (ATCC 25922)、金黄色葡萄球菌 (ATCC 25923) 和真菌克柔念珠菌 (ATCC 6258) 和白色念珠菌 (ATCC 90028)。测试在体外和体内进行。由此确定抑菌圈直径、最低抑菌浓度以及致死浓度和有效浓度(LC50和EC50)。将这些化合物的抗菌活性与作为抗菌剂的环丙沙星和甲氧苄啶-磺胺甲恶唑以及作为抗真菌药物的氟康唑进行比较。所有化合物都对所使用的培养型细菌和真菌表现出不同的活性。然而,它们的活性低于所使用的标准药物(氟康唑除外),氟康唑对克柔念珠菌(ATCC 6258)没有任何活性,但配体、DCBS2ABT 和所有合成的金属络合物对其具有很强的活性。致死浓度 (LC50) 范围为 81.00 ± 6.8-256.30 ± 36.7 ppm。这些都在允许浓度之内。