Novel Cofacial Porphyrin-Based Homo- and Heterotrimetallic Complexes of Transition Metals.

ABSTRACT: 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.

SUBMITTER: Schissler C 

PROVIDER: S-EPMC8597099 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature