AI Article Synopsis

  • Six tetranuclear metallacycles and three hexanuclear metallacages were created through coordinated self-assembly involving imidazole-based compounds and various dinuclear ruthenium(II) acceptors.
  • The self-assembly process led to the formation of stable and symmetrical structures, despite potential for isomeric variations due to different binding interactions.
  • The resulting complexes, particularly those with the 5,8-dioxido-1,4-naphtoquinonato spacer, demonstrated promising anticancer effects while showing lower toxicity to normal cells, and strong binding to ctDNA was highlighted as a key feature of one specific complex.

Article Abstract

Six tetranuclear rectangular metallacycles were synthesized via the [2+2] coordination-driven self-assembly of imidazole-based ditopic donor 1,4-bis(imidazole-1-yl)benzene and 1,3-bis(imidazol-1-yl)benzene, with dinuclear half-sandwich -cymene ruthenium(II) acceptors [Ru(µ-η-oxalato)(η--cymene)](SOCF), [Ru(µ-η-2,5-dioxido-1,4-benzoquinonato)(η--cymene)](SOCF) and [Ru(µ-η-5,8-dioxido-1,4-naphtoquinonato)(η--cymene)](SOCF), respectively. Likewise, three hexanuclear trigonal prismatic metallacages were prepared via the [2+3] self-assembly of tritopic donor of 1,3,5-tri(1-imidazol-1-yl)benzene with these ruthenium(II) acceptors respectively. Self-selection of the single symmetrical and stable metallacycle and cage was observed although there is the possibility of forming different conformational isomeric products due to different binding modes of these imidazole-based donors. The self-assembled macrocycles and cage containing the 5,8-dioxido-1,4-naphtoquinonato (donq) spacer exhibited good anticancer activity on all tested cancer cell lines (HCT-116, MDA-MB-231, MCF-7, HeLa, A549, and HepG-2), and showed decreased cytotoxicities in HBE and THLE-2 normal cells. The effect of Ru and imidazole moiety of these assemblies on the anticancer activity was discussed. The study of binding ability of these donq-based Ru assemblies with ctDNA indicated that the complex 9 with 180° linear 1 ligand has the highest bonding constant to ctDNA.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410782PMC
http://dx.doi.org/10.1073/pnas.1818677116DOI Listing

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