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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
