Supramolecular circular helicates formed by destabilisation of supramolecular dimers.
The effect of changes in the angles at the connection points of linear/circular helicates is explored as a route to control the nuclearity and architecture of metallo-supramolecular arrays. This effect is probed by changing the geometry of the metal centre used to assemble bis-pyridylimine ligands that contain a 1,3-bis(aminomethyl) benzene spacer group. Tetrahedral metal ions favour linear dimers, whereas octahedral nickel(II) predominantly gives a triangular circular helicate. Five-coordinate copper(II) falls in the middle of these extremes and results in the formation of solvent-dependent mixtures of dimer and trimer. The trinuclear, triangular, circular helicate structures, which result from coordination to copper(II) and nickel(II), are structurally characterised by X-ray crystallography and reveal that the units can aggregate into hexagonal arrays that contain anion-filled tube-like channels in the solid state.
Hamblin
Jacqueline
J
Department of Chemistry, University of Leicester, Leicester, UK.
Tuna
Floriana
F
Bunce
Siona
S
Childs
Laura J
LJ
Jackson
Alexander
A
Errington
William
W
Alcock
Nathaniel W
NW
Nierengarten
Helene
H
Van Dorsselaer
Alain
A
Leize-Wagner
Emmanuelle
E
Hannon
Michael J
MJ
D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D008024:Ligands; D009532:Nickel / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
D008024:Ligands; D011725:Pyridines; C526051:6-methylpyridine-2-carboxaldehyde; D012834:Silver; D003300:Copper; D009532:Nickel