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From Supramolecular Porphyrin Tweezers to Dynamic A n B m C l D k Multiporphyrin Arrangements Through Orthogonal Coordination
Author(s) -
Kishore Ravuri S. K.,
Paululat Thomas,
Schmittel Michael
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600463
Subject(s) - supramolecular chemistry , optical tweezers , porphyrin , tweezers , physics , crystallography , chemistry , nanotechnology , materials science , optics , crystal structure , photochemistry
Abstract A dynamic, supramolecular, three‐component A n B m C l bis(zinc porphyrin) tweezer has been prepared quantitatively using the heteroleptic bisphenanthroline (HETPHEN) concept. Upon addition of nitrogenous spacers of different length, namely, the extended bipyridine 3 a , 4,4′‐bipyridine ( 3 b ), and 1,4‐diazabicyclo[2.2.2]octane (DABCO; 3 c ), to set up an additional orthogonal binding motif (Zn Por –N spacer ), three structurally different, still dynamic, four‐component A n B m C l D k assemblies were cleanly formed, as indicated by UV/Vis and NMR titrations as well as by DOSY investigations. The structures were identified as a bridged monotweezer A 2 BC 2 D, a doubly bridged double tweezer A 4 B 2 C 4 D 2 , and a triply bridged double tweezer A 4 B 2 C 4 D 3 , the latter resembling a porphyrin stack. Notably, the same structures were equally formed directly from a mixture of the constituents A, B, C, and D put together in any sequence if the correct stoichiometry was applied.