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Novel Cofacial Porphyrin‐Based Homo‐ and Heterotrimetallic Complexes of Transition Metals
Author(s) -
Schissler Christoph,
Schneider Erik K.,
Lebedkin Sergei,
Weis Patrick,
NiednerSchatteburg Gereon,
Kappes Manfred M.,
Bräse Stefan
Publication year - 2021
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.202102376
Subject(s) - porphyrin , chemistry , metalation , ligand (biochemistry) , crystallography , yield (engineering) , benzaldehyde , aryl , intramolecular force , pyrrole , photochemistry , stereochemistry , materials science , catalysis , organic chemistry , biochemistry , receptor , alkyl , metallurgy
We present a straightforward and generally applicable synthesis route for cofacially linked homo‐ and heterotrimetallic trisporphyin complexes. The protocol encompasses synthesising the first aryl‐based, trans‐ o ‐phenylene trisporphyrin starting from pyrrole and benzaldehyde with an overall yield of 3.6 %. It also allows investigating the respective cis ‐isomer as the first conformationally restricted planar‐chiral trisporphyrin. The free‐base ligand was used in subsequent metalation reactions to afford the corresponding homotrimetallic Mn(III)‐, Fe(III)‐, Ni(II)‐, Cu(II)‐, Zn(II)‐ and Pd(II) complexes – additionally, a small adaptation of the protocol resulted in the defined Ni(II)Fe(III)Ni(II) complex in a total yield of 2.3 %. By monitoring Ni(II) insertion into the empty trimeric ligands, we affirmed that the outer porphyrin rings are filled before the internal ring. The molecular species were characterised by 1 H NMR, UV‐Vis, photoluminescence, IR, MS, CID, and high‐resolution IMS measurements.