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- Title
Modulating the Shape of Short Metal‐Mediated Heteroleptic Tapes of Porphyrins.
- Authors
Vidal, Alessio; Rossato, Daniel; Iengo, Elisabetta; Balducci, Gabriele; Alessio, Enzo
- Abstract
In view of developing artificial light‐responsive complex systems, the preparation of discrete and robust heteroleptic assemblies of different chromophores in precisely defined positions is of great value since they would allow to investigate directional processes unavailable in symmetrical architectures. Here we describe the preparation, through a modular stepwise approach, and characterization of four novel and robust metal‐mediated heteroleptic 4+3 porphyrin tapes, labeled D4−T4−D4, D3−T4−D3, D4−T3−D4, and D3−T3−D3, where a central meso‐tetrapyridylporphyrin (either 3′‐TPyP=T3 or 4′‐TPyP=T4) is connected to two equal cis‐dipyridylporphyrins (either 3′cisDPyMP=D3 or 4′cisDPyMP=D4) through four {t,c,c‐RuCl2(CO)2} fragments. Whereas D4−T4−D4 is flat, the tapes containing at least one 3′PyP, i. e. D3−T4−D3, D4−T3−D4, and D3−T3−D3, have unprecedented – and well defined – 3D geometries, and each exists in solution as a pair of stereoisomers in slow conformational equilibrium. The X‐ray molecular structures of two such conformers, the C‐shaped (D3−T4−D3)C and the z‐shaped (D4−T3−D4)z, were determined and are fully consistent with the solution NMR findings.
- Subjects
PORPHYRINS; MOLECULAR structure; STEREOISOMERS; CHROMOPHORES
- Publication
Chemistry - A European Journal, 2023, Vol 29, Issue 36, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202300893