Abstract：
In the present study, one mononuclear Cu(II) [CuL(SCN)] (1) and one mononuclear Co(II) [CoLN3] (2) complexes, with a Schiff base ligand (HL) formed by condensation of 2-picolylamine and salicylaldehyde, have been successfully developed and structurally characterized. The square planer geometry of both complexes is fulfilled by the coordination of one deprotonated ligand and one ancillary ligand SCN-(1) or N3-(2) to the metal centre. Binding affinities of both complexes with deoxyribonucleic acid (DNA) and human serum albumin (HSA) are investigated using several biophysical and spectroscopic techniques. High values of the macromolecule-complex binding constants and other results confirm the effectiveness of both complexes towards binding with DNA and HSA. The determined values of the thermodynamic parameters support spontaneous interactions of both complexes with HSA, while fluorescence displacement and DNA melting studies establish groove-binding interactions with DNA for both complexes 1 and 2. The molecular modelling study validates the experimental findings. Both complexes are subjected to an MTT test establishing the anticancer property of complex 1 with lower risk to normal cells, confirmed by the IC50 values of the complex for HeLa cancer cells and HEK normal cells. Finally, a nuclear staining analysis reveals that the complexes have caused apoptotic cell death.
摘要：
在本研究中,一个单核Cu（II）[CuL（SCN）]（1）和一个单核Co（II）[CoLN3]（2）配合物，与通过2-吡啶甲基胺和水杨醛缩合形成的席夫碱配体（HL），已成功开发和结构表征。通过一个去质子化的配体和一个辅助配体SCN-（1）或N3-（2）与金属中心的配位，实现了两种配合物的方形平面几何形状。使用几种生物物理和光谱技术研究了两种复合物与脱氧核糖核酸（DNA）和人血清白蛋白（HSA）的结合亲和力。大分子-复合物结合常数的高值和其他结果证实了两种复合物对与DNA和HSA结合的有效性。热力学参数的确定值支持两种复合物与HSA的自发相互作用，而荧光置换和DNA解链研究建立了复合物1和2与DNA的沟结合相互作用。分子建模研究验证了实验结果。两种复合物都进行了MTT测试，建立了复合物1的抗癌特性，对正常细胞具有较低的风险，复合物对HeLa癌细胞和HEK正常细胞的IC50值证实。最后,核染色分析表明，复合物已导致凋亡细胞死亡。
