Synthesis and Properties of Bis-Porphyrin Molecular Tweezers: Effects of Spacer Flexibility on Binding and Supramolecular ChirogenesisReport as inadecuate




Synthesis and Properties of Bis-Porphyrin Molecular Tweezers: Effects of Spacer Flexibility on Binding and Supramolecular Chirogenesis - Download this document for free, or read online. Document in PDF available to download.

1

Department of Chemistry-BMC, Uppsala University, Uppsala S-75123, Sweden

2

Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK





*

Author to whom correspondence should be addressed.



Academic Editor: M. Graça P. M. S. Neves

Abstract Ditopic binding of various dinitrogen compounds to three bisporphyrin molecular tweezers with spacers of varying conformational rigidity, incorporating the planar enediyne 1, the helical stiff stilbene 2, or the semi-rigid glycoluril motif fused to the porphyrins 3, are compared. Binding constants Ka = 104–106 M−1 reveal subtle differences between these tweezers, that are discussed in terms of porphyrin dislocation modes. Exciton coupled circular dichroism ECCD of complexes with chiral dinitrogen guests provides experimental evidence for the conformational properties of the tweezers. The results are further supported and rationalized by conformational analysis. View Full-Text

Keywords: bisporphyrin tweezers; metalloporphyrins; porphyrinoids; host-guest chemistry; supramolecular chemistry; chirogenesis; chirality transfer; exciton coupled circular dichroism; conformational analysis bisporphyrin tweezers; metalloporphyrins; porphyrinoids; host-guest chemistry; supramolecular chemistry; chirogenesis; chirality transfer; exciton coupled circular dichroism; conformational analysis





Author: Magnus Blom 1, Sara Norrehed 1, Claes-Henrik Andersson 1, Hao Huang 1, Mark E. Light 2, Jonas Bergquist 1, Helena Grennberg 1 and Adolf Gogoll 1,*

Source: http://mdpi.com/



DOWNLOAD PDF




Related documents