Chloride as Supramolecular Glue:Anion-Directed Assembly of a 2D Network of Mn~(III) Complexes

摘要

The Schiff base H_4L [where H_4L=N,N'-bis(3-hydroxysalicyl-idene)ethane-l,2-diamine],containing six potential donor atoms,is able to induce the formation of a novel [Mn~(III)(H_2L)(CH_3OH)_2]Cl (1) complex,which was characterized by elemental analysis,FAB mass spectrometry,IR,~1H NMR and electronic spectroscopy,magnetic measurements,X-ray diffraction techniques and conductivity measurements.The study of its redox properties by cyclic and normal pulse voltammetry is also reported.The crystal structure of 1 is formed by monomeric cationic Mn~(III) complexes,where the manganese ion is in an octahedral environment and is coordinated in the equatorial plane to the N_2O_2 donor set of the inner Schiff-base compartment.The neutral condition of the complex is achieved with the presence of the chloride coun-terion,which behaves as a multiple acceptor of hydrogen bonds.The chloride is involved in four O-H…Cl bonds,connecting three neighbouring cationic complexes.To the best of our knowledge,this constitutes the first example of self-assembly of discrete units of Mn~(III) complexes in a 2D network in the solid state through hydrogen bonding,where the anion is acting as a Supramolecular glue.