Six-coordinate zinc porphyrins for template-directed synthesis of spiro-fused nanorings.

Journal article

Five-coordinate geometry is the standard binding mode of zinc porphyrins with pyridine ligands. Here we show that pseudo-octahedral six-coordinate zinc porphyrin complexes can also be formed in solution, by taking advantage of the chelate effect. UV-vis-NIR titrations indicate that the strength of this second coordination is ca. 6-8 kJ mol(-1). We have used the formation of six-coordinate zinc porphyrin complexes to achieve the template-directed synthesis of a 3D π-conjugated spiro-fused array of 11 porphyrin units, covalently connected in a nontrivial topology. Time-resolved fluorescence anisotropy experiments show that electronic excitation delocalizes between the two perpendicular nanorings of this spiro-system within the experimental time-resolution of 270 fs.

Authors: Favereau, L; Cnossen, A; Kelber, J; Gong, J; Oetterli, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Chemical Society
• Journal: Journal of the American Chemical Society
• Volume: 137
• Issue: 45
• Pages: 14256-14259
• Publication date: 2015-11-06
• Acceptance date: 2015-09-26
• DOI: 10.1021/jacs.5b10126
• EISSN: 1520-5126
• ISSN: 0002-7863
• Language: English