Synthesis, spectroscopic characterization, and antimicrobial activity of cobalt(II) complexes of acetone-N(4)-phenylsemicarbazone: crystal structure of [Co(HL)2(MeOH)2](NO3)2
作者:V. L. Siji、M. R. Sudarsanakumar、S. Suma
DOI:10.1007/s11243-011-9485-z
日期:2011.5
Four Co(II) complexes, [Co(HL)2](OAc)2, [Co(HL)2Cl2], [Co(HL)2(MeOH)2](NO3)2, and [Co2(HL)4(SO4)2] (HL = acetone-N(4)-phenylsemicarbazone) were synthesized and characterized by physicochemical and spectroscopic methods. The magnetic susceptibility measurements indicate that the complexes are paramagnetic with three unpaired electrons. In all the complexes, the semicarbazone is coordinated as a neutral bidentate ligand. The structure of [Co(HL)2(MeOH)2](NO3)2 was confirmed by single crystal X-ray crystallography. The ligand is neutral and bidentate, being coordinated to the cobalt atom through the carbonyl oxygen and the azomethine nitrogen. Intermolecular hydrogen bonding and C–H···π interactions combine to stabilize the crystal structure. The ligand and its two complexes [Co(HL)2Cl2] and [Co(HL)2(MeOH)2](NO3)2 were screened for their antibacterial and antifungal activities using disk diffusion methods.
通过物理化学和光谱方法合成并表征了四种钴(II)配合物:[Co(HL)2](OAc)2、[Co(HL)2Cl2]、[Co(HL)2(MeOH)2](NO3)2 和 [Co2(HL)4(SO4)2] (HL = acetone-N(4)-phenylsemicarbazone) 。磁感应强度测量结果表明,这些配合物具有三个未成对电子的顺磁性。在所有配合物中,半咔唑酮作为中性双齿配体配位。单晶 X 射线晶体学证实了[Co(HL)2(MeOH)2](NO3)2 的结构。配体为中性双齿配体,通过羰基氧和氮杂羰基氮与钴原子配位。分子间氢键和 C-H---π 相互作用共同稳定了晶体结构。利用盘扩散法筛选了配体及其两种配合物 [Co(HL)2Cl2] 和 [Co(HL)2(MeOH)2](NO3)2 的抗菌和抗真菌活性。