Complexation of 16-membered P4N2 macrocycles with Fe(II) ion as tool for stabilization of their RPSPSPRP stereoisomers. (1st October 2022) - Musina, Elvira I.
Graphical abstract: The only R P S P S P R P -isomer of Fe(II) complex with P4 N2 ligand is formed by complexation of any stereoisomer of 16-membered aminomethylphosphine with Fe(BF4 )2. Abstract: The novel mononuclear Fe(II) complexes of 16-membered P4 N2 ligands were synthesized, where octahedral Fe(II) ion is coordinated by four phosphorus atoms of the ligand in equatorial positions and nitrogen atoms of two acetonitrile co-ligands in apical positions. The tetraphosphine ligands demonstrate the RP SP SP RP -configuration regardless of the configuration of the starting stereoisomer of the macrocycles, so that the complexation with iron(II) salts drives up the fixation of this configuration of 1, 9-di(R)-1, 9-diaza-3, 7, 11, 15-tetraphenyl-3, 7, 11, 15-tetraphosphacyclohexadecanes, which in turn is favorable for the binding of octahedral metal cations.