Single-turn helix-coil strands stabilized by metal···metal and π-π interactions of the alkynylplatinum(II) terpyridyl moieties in meta-phenylene ethynylene foldamers

Sammual Yu-Lut Leung; Anthony Yiu-Yan Tam; Chi-Hang Tao; Hoi Shan Chow; Vivian Wing-Wah Yam

doi:10.1021/ja208444c

Single-turn helix-coil strands stabilized by metal···metal and π-π interactions of the alkynylplatinum(II) terpyridyl moieties in meta-phenylene ethynylene foldamers

J Am Chem Soc. 2012 Jan 18;134(2):1047-56. doi: 10.1021/ja208444c. Epub 2011 Dec 20.

Authors

Sammual Yu-Lut Leung¹, Anthony Yiu-Yan Tam, Chi-Hang Tao, Hoi Shan Chow, Vivian Wing-Wah Yam

Affiliation

¹ Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee (Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.

PMID: 22188397
DOI: 10.1021/ja208444c

Abstract

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 (1)H NMR, 2D ROESY NMR, electronic absorption, and emission spectroscopies.