scholarly journals Synthesis, characterization, and cytotoxic properties of mono- and di-nuclear cobalt(ii)-polypyridyl complexes

2018 ◽  
Vol 47 (16) ◽  
pp. 5755-5763 ◽  
Author(s):  
Arvin Eskandari ◽  
Arunangshu Kundu ◽  
Chunxin Lu ◽  
Sushobhan Ghosh ◽  
Kogularamanan Suntharalingam
Keyword(s):  
Polypyridyl Complexes ◽  
Polypyridyl Ligand

We report the synthesis and characterisation of mono- and di-nuclear cobalt(ii) complexes (1–3) containing L1, a polypyridyl ligand with pyrazole moieties.

scholarly journals Structure-Property Relationships for a Series of Ruthenium(II) Polypyridyl Complexes Elucidated through Raman Spectroscopy

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Luke O’Neill ◽  
Laura Perdisatt ◽  
Christine O’Connor
Keyword(s):  
Raman Spectroscopy ◽  
Single Photon ◽  
Stokes Shift ◽  
Electronic Spectroscopy ◽  
Photon Counting ◽  
Terminal Group ◽  
Luminescence Spectroscopy ◽  
Structure Property ◽  
Polypyridyl Complexes ◽  
Polypyridyl Ligand

A series of ruthenium polypyridyl complexes were studied using Raman spectroscopy supported by UV/Vis absorption, luminescence spectroscopy, and luminescence lifetime determination by time-correlated single photon counting (TCSPC). The complexes were characterised to determine the influence of the variation of the conjugation across the main polypyridyl ligand. The systematic and sequential variation of the main polypyridyl ligand, 2-(4-formylphenyl)imidazo[4,5-f][1,10]phenanthroline (FPIP), 2-(4-cyanophenyl)imidazo[4,5-f][1,10]phenanthroline (CPIP), 2-(4-bromophenyl)imidazo[4,5-f][1,10]phenanthroline (BPIP), and 2-(4-nitrophenyl)imidazo[4,5-f][1,10]phenanthroline (NPIP) ligands, allowed the monitoring of very small changes in the ligands electronic nature. Complexes containing a systematic variation of the position (para, meta, and ortho) of the nitrile terminal group on the ligand (the para being 2-(4-cyanophenyl)imidazo[4,5-f][1,10]phenanthroline (p-CPIP), the meta 2-(3-cyanophenyl)imidazo[4,5-f][1,10]phenanthroline (m-CPIP) and 2-(2-cyanophenyl)imidazo[4,5-f][1,10]phenanthroline (o-CPIP)) were also characterised. Absorption, emission characteristics, and luminescence yields were calculated and correlated with structural variation. It was found that both the electronic changes in the aforementioned ligands showed very small spectral changes with an accompanying complex relationship when examined with traditional electronic methods. Stokes shift and Raman spectroscopy were then employed as a means to directly gauge the effect of polypyridyl ligand change on the conjugation and vibrational characteristics of the complexes. Vibrational coherence as measured as a function of the shifted frequency of the imizodale bridge was shown to accurately describe the electronic coherence and hence vibrational cooperation from the ruthenium centre to the main polypyridyl ligand. The well-defined trends established and elucidated though Raman spectroscopy show that the variation of the polypyridyl ligand can be monitored and tailored. This allows for a greater understanding of the electronic and excited state characteristics of the ruthenium systems when traditional electronic spectroscopy lacks the sensitivity.

Water-soluble amphiphilic ruthenium(ii) polypyridyl complexes as potential light-activated therapeutic agents

2020 ◽  
Vol 56 (65) ◽  
pp. 9332-9335
Author(s):  
Sandra Estalayo-Adrián ◽  
Salvador Blasco ◽  
Sandra A. Bright ◽  
Gavin J. McManus ◽  
Guillermo Orellana ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Cancer Cells ◽  
Cellular Uptake ◽  
Therapeutic Agents ◽  
Water Soluble ◽  
Polypyridyl Complexes ◽  
Cervical Cancer Cells

Two new water-soluble amphiphilic Ru(ii) polypyridyl complexes were synthesised and their photophysical and photobiological properties evaluated; both complexes showed a rapid cellular uptake and phototoxicity against HeLa cervical cancer cells.

Induction of Apoptosis in SKOV3 and DNA Binding by Cobalt(Iii) Polypyridyl Complexes

2019 ◽  
Vol 45 (4) ◽  
pp. 403-403
Author(s):  
Ch. Ravi ◽  
Ravi Kumar Vuradi ◽  
Srishailam Avudoddi ◽  
M. Ramchander ◽  
S. Satyanarayana
Keyword(s):  
Dna Binding ◽  
Polypyridyl Complexes ◽  
Induction Of Apoptosis

scholarly journals Half-sandwich organometallic Ru and Rh complexes of (N,N) donor compounds: effect of ligand methylation on solution speciation and anticancer activity

2021 ◽  
Author(s):  
János P. Mészáros ◽  
Veronika F. S. Pape ◽  
Gergely Szakács ◽  
Gábor Németi ◽  
Márk Dénes ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Anticancer Activity ◽  
Polypyridyl Complexes ◽  
Solution Behaviour ◽  
Half Sandwich ◽  
Solution Speciation

A series of half-sandwich polypyridyl complexes was synthesized and compared focusing on structural, cytotoxic and aqueous solution behaviour. The formula of the synthesized complexes is [M(arene)(N,N)Cl]Cl, where M: Ru or...

scholarly journals Design, Synthesis and Pharmacological Evaluation of Three Novel Dehydroabietyl Piperazine Dithiocarbamate Ruthenium (II) Polypyridyl Complexes as Potential Antitumor Agents: DNA Damage, Cell Cycle Arrest and Apoptosis Induction

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1453
Author(s):  
Haoran Wang ◽  
Jianhua Wei ◽  
Hong Jiang ◽  
Ye Zhang ◽  
Caina Jiang ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Dna Damage ◽  
Cell Cycle Arrest ◽  
Antitumor Agents ◽  
Mechanistic Study ◽  
Ros Generation ◽  
Polypyridyl Complexes ◽  
Expression Levels ◽  
Cycle Arrest ◽  
Study Results

The use of cisplatin is severely limited by its toxic side-effects, which has spurred chemists to employ different strategies in the development of new metal-based anticancer agents. Here, three novel dehydroabietyl piperazine dithiocarbamate ruthenium (II) polypyridyl complexes (6a–6c) were synthesized as antitumor agents. Compounds 6a and 6c exhibited better in vitro antiproliferative activity against seven tumor cell lines than cisplatin, they displayed no evident resistance in the cisplatin-resistant cell line A549/DPP. Importantly, 6a effectively inhibited tumor growth in the T-24 xenograft mouse model in comparison with cisplatin. Gel electrophoresis assay indicated that DNA was the potential targets of 6a and 6c, and the upregulation of p-H2AX confirmed this result. Cell cycle arrest studies demonstrated that 6a and 6c arrested the cell cycle at G1 phase, accompanied by the upregulation of the expression levels of the antioncogene p27 and the down-regulation of the expression levels of cyclin E. In addition, 6a and 6c caused the apoptosis of tumor cells along with the upregulation of the expression of Bax, caspase-9, cytochrome c, intracellular Ca2+ release, reactive oxygen species (ROS) generation and the downregulation of Bcl-2. These mechanistic study results suggested that 6a and 6c exerted their antitumor activity by inducing DNA damage, and consequently causing G1 stage arrest and the induction of apoptosis.

Experimental and density functional theory (DFT) studies on the interactions of Ru(ii) polypyridyl complexes with the RAN triplex poly(U)˙poly(A)*poly(U)

Metallomics ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 2148-2156 ◽  
Author(s):  
Hong Zhang ◽  
Xuewen Liu ◽  
Xiaojun He ◽  
Ying Liu ◽  
Lifeng Tan
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Dft Studies ◽  
Functional Theory ◽  
Polypyridyl Complexes

In this paper, the binding of two Ru(ii) complexes with poly(U)˙poly(A)*poly(U) was studied. Furthermore, the effect of factors on the binding difference is discussed.

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