Self-Assembly with Postmodification: Kinetically Stabilized Metalla-Supramolecular Rectangles
作者:Christopher J. Kuehl、Songping D. Huang、Peter J. Stang
DOI:10.1021/ja0114355
日期:2001.10.1
Interaction of a predesigned molecular "clip" (4) with rigid dipyridyl bridging ligands, in acetone/ water mixtures, leads to the formation of molecular rectangles (5-8) in 92-97% isolated yields via spontaneous self-assembly. Characterization was accomplished with multinuclear NMR and UV-vis spectroscopy, FAB mass spectrometry, and X-ray crystallography. The length of these metallamacrocycles ranges from 2 to 3 nm. Postmodification via non-nucleophilic counterion exchange results in enhanced structural integrity for the assemblies.
Anticancer Activity and Autophagy Involvement of Self-Assembled Arene–Ruthenium Metallacycles
作者:Abhishek Dubey、Yong Joon Jeong、Jae Ho Jo、Sangkook Woo、Dong Hwan Kim、Hyunuk Kim、Se Chan Kang、Peter J. Stang、Ki-Whan Chi
DOI:10.1021/acs.organomet.5b00512
日期:2015.9.28
A suite of six metallacycles (16) was generated via coordination-driven self-assembly using the three dicarboxylate-bridged areneRu precursors [Ru-2(mu-eta(4)-OO boolean AND OO)(eta(6)-p-iPrC(6)H4Me)(2)][CF3SO3](2); (OO boolean AND OO = oxalate (A1), 2,5-dihydroxy-1,4-benzoquinonato (dobq) (A2), 5,8-dihydroxy-1,4-naphthoquinonato (donq) (A3); CF3SO3 = triflate) with one of two dipyridyl ligands (L1 and L2). The metallacycles were isolated in excellent yield (8692%) as triflate salts and characterized by proton (H-1) and carbon-13 (C-13) nuclear magnetic resonance (NMR) and electrospray ionizationmass spectrometry (ESI-MS) to confirm their structural assignments. Single-crystal X-ray crystal analysis of 1 revealed that two L1 ligands bridged two A1 acceptors to form a rectangular architecture. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was conducted to evaluate the in vitro cytotoxicities relative to two chemotherapeutic agents: namely, cisplatin and doxorubicin. Metallacycles 3 and 6 potently inhibited the growth of HCT-15 human colon and AGS human gastric cancer cells. The hollow fiber (HF) assay was performed to investigate the in vivo antitumor activities of metallacycles 3 and 6. Metallacycle 6 was more effective in inhibiting HCT-15 cells than metallacycle 3 in both in vitro and in vivo studies. Moreover, 3 and 6 induced autophagic activity in HCT-15 cells. These results suggested that the autophagic response elicited by metallacycles 3 and 6 could mediate the anticancer effects observed in human colorectal cancer cells.