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Size‐Selective Encapsulation of Hydrophobic Guests by Self‐Assembled M 4 L 6 Cobalt and Nickel Cages
Author(s) -
Ronson Tanya K.,
Giri Chandan,
Kodiah Beyeh N.,
Minkkinen Antti,
Topić Filip,
Holstein Julian J.,
Rissanen Kari,
Nitschke Jonathan R.
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201203751
Subject(s) - nickel , cobalt , crystallography , chemistry , molecule , metal , metal ions in aqueous solution , self assembly , inorganic chemistry , organic chemistry
Subtle differences in metal–ligand bond lengths between a series of [M 4 L 6 ] 4− tetrahedral cages, where M=Fe II , Co II , or Ni II , were observed to result in substantial differences in affinity for hydrophobic guests in water. Changing the metal ion from iron(II) to cobalt(II) or nickel(II) increases the size of the interior cavity of the cage and allows encapsulation of larger guest molecules. NMR spectroscopy was used to study the recognition properties of the iron(II) and cobalt(II) cages towards small hydrophobic guests in water, and single‐crystal X‐ray diffraction was used to study the solid‐state complexes of the iron(II) and nickel(II) cages.