Effect of non-covalent interaction on the diastereoselective self-assembly of Cu(II) complexes containing a racemic Schiff base in a chiral self-discriminating process

作者：Jena Himanshu Sekhar^*

来源：New Journal of Chemistry, 2014, 38(6): 2486-2499.

DOI：10.1039/c3nj01547e

The diastereosetective self-assembly of five Cu(II) heterochiral complexes containing a racemic Schiff base ligand LH (where LH = (R,S) 2-((1-(2-pyridyl)ethylimino)methyl)phenol in a chiral self-discriminating process is reported. Complexes 1-5 are synthesized using ligand LH, Cu(NO3)(2).3H(2)O, Cu(ClO4)(2)center dot 6H(2)O, and co-ligands such as N-3(-), NCS-, NCO-, and are conclusively structurally characterized. Determination of the molecular structures of 1-5 confirmed the presence of a di-copper core with an inversion centre located directly between the two copper ions. In 1-5, each ligand in the di-copper core discriminates its own chirality and results in heterochiral dimerization in a chiral self-discriminating manner. The crystal packing pattern of compounds 1-5 are analyzed in terms of non-covalent C-H...O, C-H...N, C-H...pi and parallel displaced pi...pi It interactions. In the crystal structure of compounds 1-4, there is a parallel displaced it. %26quot; interaction between the pyridine and benzene rings in the two adjacent heterochiral dimers, which act cooperatively with other different non-covalent interactions. In 2, the coordinated water molecule acts as a bifurcated H-bond donor to phenoxo-O and perchlorate-O in a diastereosetective and enantioselective manner, respectively. The results described here address new examples of the rarely occurring chiral self-discriminating process.

• 出版日期2014-6