Paramagnetic Cage-Type Co(II) Complexes of Chiral Macrocycles: Enantio- and Size-Selective Binding of Guest Molecules DOI Creative Commons
Jan Janczak, Jerzy Lisowski

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Фев. 23, 2025

Two enantiomers of the cage-type complex, [Co3LR2] and [Co3LS2] a large hexaazatriphenolic [3 + 3] macrocyclic imine L, have been synthesized characterized on basis NMR, CD, ESI MS spectra. The X-ray crystal structures [Co3L2] crystalline forms reveal two macrocycles cone shape stitched together by three Co(II) ions, forming barrel-shaped molecule with central void. Because limited size cavity enantiopure nature these enantiomeric complexes, both size-selective enantioselective binding guest molecules are observed. In case chiral guests, interaction paramagnetic centers leads to an effective NMR enantiodifferentiation signals molecules, even at host:guest ratios as low 1:200. tight prochiral such ethanol isopropanol within results in splitting enantiotopic methylene methyl signals. dc magnetic data for accord presence high-spin ac susceptibility this complex indicate field-induced single magnet (SMM) behavior. contrast reaction Co(II), ligand H3L Ni(II) or Cu(II) salts contraction macrocycle formation complexes smaller [2 2] macrocycle.

Язык: Английский

Paramagnetic Cage-Type Co(II) Complexes of Chiral Macrocycles: Enantio- and Size-Selective Binding of Guest Molecules DOI Creative Commons
Jan Janczak, Jerzy Lisowski

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Фев. 23, 2025

Two enantiomers of the cage-type complex, [Co3LR2] and [Co3LS2] a large hexaazatriphenolic [3 + 3] macrocyclic imine L, have been synthesized characterized on basis NMR, CD, ESI MS spectra. The X-ray crystal structures [Co3L2] crystalline forms reveal two macrocycles cone shape stitched together by three Co(II) ions, forming barrel-shaped molecule with central void. Because limited size cavity enantiopure nature these enantiomeric complexes, both size-selective enantioselective binding guest molecules are observed. In case chiral guests, interaction paramagnetic centers leads to an effective NMR enantiodifferentiation signals molecules, even at host:guest ratios as low 1:200. tight prochiral such ethanol isopropanol within results in splitting enantiotopic methylene methyl signals. dc magnetic data for accord presence high-spin ac susceptibility this complex indicate field-induced single magnet (SMM) behavior. contrast reaction Co(II), ligand H3L Ni(II) or Cu(II) salts contraction macrocycle formation complexes smaller [2 2] macrocycle.

Язык: Английский

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