Single-Turn Helix–Coil Strands Stabilized by Metal···Metal and π–π Interactions of the Alkynylplatinum(II) Terpyridyl Moieties in meta-Phenylene Ethynylene Foldamers

Single-Turn Helix–Coil Strands Stabilized by Metal···Metal and π–π Interactions of the Alkynylplatinum(II) Terpyridyl Moieties in meta-Phenylene Ethynylene Foldamers

Dinuclear alkynylplatinum(II) terpyridyl complexes with oligomeric bridge consisting of five repeating meta-phenylene ethynylene (mPE) units have been found to exhibit a strong tendency to fold back onto themselves to form short helical strands through the stabilization of Pt···Pt and π–π interactio...

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Bibliographic Details
Published in:Journal of the American Chemical Society Vol. 134; no. 2; pp. 1047 - 1056
Main Authors: Leung, Sammual Yu-Lut, Tam, Anthony Yiu-Yan, Tao, Chi-Hang, Chow, Hoi Shan, Yam, Vivian Wing-Wah
Format: Journal Article
Language:English
Published: United States American Chemical Society 18-01-2012
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Summary:Dinuclear alkynylplatinum(II) terpyridyl complexes with oligomeric bridge consisting of five repeating meta-phenylene ethynylene (mPE) units have been found to exhibit a strong tendency to fold back onto themselves to form short helical strands through the stabilization of Pt···Pt and π–π interactions. The steric bulk of the terpyridine ligands and the length of the oligomeric bridge have been found to affect the extent of the intramolecular Pt···Pt interaction that governs the stabilization of the short helical strand in solution. Their folding properties via Pt···Pt and π–π stacking interactions have been studied by 1H NMR, 2D ROESY NMR, electronic absorption, and emission spectroscopies.
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja208444c