Synthesis, Characterization and Biological Studies on Cobalt(II) and Nickel(II) Complexes with Mannich Base 2-(Pyrrolidin-1-ylmethyl)isoindoline-1,3-dione
作者:M. Yosuva Suvaikin、C. Kalaivanan
DOI:10.14233/ajchem.2019.21818
日期:2019.6.10
A new Mannich base 2-(pyrrolidin-1-ylmethyl)isoindoline-1,3-dione was synthesized by the condensation of phthalimide, formaldehyde and pyrrolidine and was characterized on the basis of elemental analysis and IR, UV-visible, 1H and 13C NMR data. Cobalt(II) and nickel(II) complexes of new Mannich base were synthesized and characterized by elemental analysis, electrical conductance, electronic and IR spectra, magnetic measurements, thermal analysis and cyclic voltammetric studies. From IR data, it is inferred that the ligand is neutral bidentate bonding through pyrrolidine ring containing nitrogen and one of the two carbonyl oxygens. The magnetic moment values and electronic spectral data show that all the complexes studied are tetrahedral except Co(II) chloro complex. The electrochemical studies show that Co(II)/Co(I) redox couple exists during electrolysis. Thermal results indicate that Co(II) sulphato and Ni(II) chloro complexes undergo two stage decompositions to produce CoSO4 and NiO, respectively as final residues and that the ligand forms a polymer of formaldehyde as an intermediate. The antimicrobial activity measured by the agar well diffusion method showed that the metal complexes are more active than the ligand probably because of the chelation effect.
以邻苯二甲酰亚胺、甲醛和吡咯烷缩合合成了新型曼尼希碱2-(吡咯烷-1-基甲基)异吲哚啉-1,3-二酮,并通过元素分析和IR、UV-vis、1H和13C进行了表征。核磁共振数据。合成了新曼尼希碱的钴(II)和镍(II)配合物,并通过元素分析、电导、电子和红外光谱、磁性测量、热分析和循环伏安研究进行了表征。从IR数据推断,该配体是通过含有氮和两个羰基氧之一的吡咯烷环形成的中性二齿键合。磁矩值和电子光谱数据表明,除Co(II)氯配合物外,所有研究的配合物都是四面体。电化学研究表明电解过程中存在Co(II)/Co(I)氧化还原对。热结果表明,Co(II) 硫酸盐和 Ni(II) 氯配合物经历两阶段分解,分别产生 CoSO4 和 NiO 作为最终残留物,并且配体形成甲醛聚合物作为中间体。通过琼脂井扩散法测量的抗菌活性表明,金属配合物比配体更具活性,这可能是由于螯合效应。