title: Anion-driven conformation control and enhanced sulfate binding utilising aryl linked salicylaldoxime dicopper helicates.
abstract: The synthesis and spectroscopic analysis of both "metal-only" and anion encapsulated dicopper(II) double helicates utilising a new 1,4-aryl spacer is described. X-Ray crystallographic analysis of the complexes reveal that the aromatic spacer increases rigidity in the complex, yet the complexes are still able to undergo a dramatic "coiling up" to bind anions. Spectroscopic analysis has shown a clear enhancement in the binding strength of SO(4)(2-) over the non-coordinating anions ClO(4)(-), NO(3)(-) and Br(-) which has been attributed to a combination of enhanced rigidity in the complex and an increased electrostatic interaction between the complex and the dianion.
authors: Institute of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
authors: James R
authors: JR
authors: Stevens
authors: Paul G
authors: PG
authors: Plieger
mesh_terms: D003300:Copper / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D010091:Oximes / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*
chemical_list: D008024:Ligands; D010091:Oximes; D012492:Salts; D013431:Sulfates; D003300:Copper; C023728:acetaldehyde oxime