Synthesis and Characterization of Self-Assembled Chiral FeII2 L3 Cages

Chemistry : a European Journal
Bin SunJoost N H Reek

Abstract

We present here the synthesis of chiral BINOL-derived (BINOL=1,1'-bi-2-naphthol) bisamine and bispyridine-aldehyde building blocks that can be used for the self-assembly of novel chiral FeII2 L3 cages when mixed with an iron(II) precursor. The properties of a series of chiral cages were studied by NMR and circular dichroism (CD) spectroscopy, cold-spray ionization MS, and molecular modeling. Upon formation of the M2 L3 cages, the iron corners can adopt various isomeric forms: mer, fac-Δ, or fac-Λ. We found that the coordination geometry around the metal centers in R-Cages 1 and 2 were influenced by the chiral BINOL backbone only to a limited extent, as a mixture of cages was formed with fac and mer configurations at the iron corners. However, single cage species (fac-RR-Cage and fac-RS-Cage) that are enantiopure and highly symmetric were obtained by generating these chiral M2 L3 cages by using the bispyridine-aldehyde building blocks in combination with chiral amine moieties to form pyridylimine ligands for coordination to iron. Next to consistent NMR spectra, the CD spectra confirm the configurations fac-(Λ,Λ) and fac-(Δ,Δ) corresponding to RR- and RS-Cage, respectively.

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Citations

Jun 4, 2020·Chemistry : a European Journal·Erica GiraldiKay Severin
Mar 19, 2019·Chemical Science·Edmundo G PercásteguiJonathan R Nitschke
Jun 15, 2021·Journal of the American Chemical Society·You-Quan ZouJonathan R Nitschke
Mar 25, 2020·Inorganic Chemistry·Dongwon KimOk-Sang Jung

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Methods Mentioned

BETA
NMR
1
circular dichroism
column chromatography
silica

Software Mentioned

BINOL

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