65219-25-2Relevant academic research and scientific papers
Synthesis and Characterization of Self-Assembled Chiral FeII2L3 Cages
Sun, Bin,Nurttila, Sandra S.,Reek, Joost N. H.
, p. 14693 - 14700 (2018/09/12)
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 FeII2L3 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 M2L3 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 M2L3 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.
Pyridine liquid crystalline compounds
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, (2008/06/13)
There is described compounds of the formula STR1 wherein X stands for CH and Y stands for N or X stands for N and Y stands for CH; A1 and A2 signify single covalent bonds or one of the groups A1 and A2 also sign
