Synthesis of 4-substituted azopyridine-functionalized Ni(II)-porphyrins as molecular spin switches.

ABSTRACT: We present the synthesis and the spin switching efficiencies of Ni(II)-porphyrins substituted with azopyridines as covalently attached photoswitchable ligands. The molecules are designed in such a way that the azopyridines coordinate to the Ni ion if the azo unit is in cis configuration. For steric reasons no intramolecular coordination is possible if the azopyridine unit adopts the trans configuration. Photoisomerization of the azo unit between cis and trans is achieved upon irradiation with 505 nm (trans→cis) and 435 nm (cis→trans). Concurrently with the isomerization and coordination/decoordination, the spin state of the Ni ion switches between singlet (low-spin) and triplet (high-spin). Previous studies have shown that the spin sw

SUBMITTER: Ludwig J 

PROVIDER: S-EPMC7590622 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature