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Chiral tether-mediated stabilization and helix-sense control of complementary metallo-double helices† †Electronic supplementary information (ESI) available: Experimental details and additional spectroscopic data. See DOI: 10.1039/c4sc02275k Click here for additional data file.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Horie, Miki Ousaka, Naoki Taura, Daisuke Yashima, Eiji |
| Copyright Year | 2015 |
| Abstract | A series of novel PtII-linked double helices were prepared by inter- or intrastrand ligand-exchange reactions of the complementary duplexes composed of chiral or achiral amidine dimer and achiral carboxylic acid dimer strands joined by trans-PtII-acetylide complexes with PPh3 ligands using chiral and achiral chelating diphosphines. The structure and stability of the PtII-linked double helices were highly dependent on the diphosphine structures. An interstrand ligand exchange took place with chiral and achiral 1,3-diphosphine-based ligands, resulting in trans-PtII-bridged double helices, whose helical structures were quite stable even in dimethyl sulfoxide (DMSO) due to the interstrand cross-link, whereas a 1,2-diphosphine-based ligand produced non-cross-linked cis-PtII-linked duplexes, resulting from an intrastrand ligand-exchange that readily dissociated into single strands in DMSO. When enantiopure 1,3-diphosphine-based ligands were used, the resulting trans-PtII-bridged double helices adopted a preferred-handed helical sense biased by the chirality of the bridged diphosphines. Interestingly, the interstrand ligand exchange with racemic 1,3-diphosphine toward an optically-active PtII-linked duplex, composed of chiral amidine and achiral carboxylic acid strands, was found to proceed in a diastereoselective manner, thus forming complete homochiral trans-PtII-bridged double helices via a unique chiral self-sorting. |
| Starting Page | 714 |
| Ending Page | 723 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c4sc02275k |
| PubMed reference number | 28706634 |
| Journal | Medline |
| Volume Number | 6 |
| Alternate Webpage(s) | http://pubs.rsc.org/en/content/articlepdf/2015/sc/c4sc02275k?page=search |
| Alternate Webpage(s) | http://pubs.rsc.org/en/content/articlepdf/2015/sc/c4sc02275k |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/sc/c4/c4sc02275k/c4sc02275k1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/c4sc02275k |
| Journal | Chemical science |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |