Dinuclear zinc(II) complexes of symmetric Schiff-base ligands with extended quinoline sidearms.
The synthesis of two 2-formylquinolines is reported via the Skraup method followed by SeO(2) oxidation. Each aldehyde is condensed with (1R,2R)-diaminocyclohexane and (R)-BINAM, yielding four enantiomerically-pure bis(imine-quinoline) ligands. The neutral ligands are reacted with ZnCl(2) to give complexes with bis(bidentate) coordination of ZnCl(2) units. X-Ray structural characterization of three complexes shows them to have a single-stranded helical motif, with M helicity, except in one case where a 1:1 mixture of M and P helices is seen. The ligands and complexes are further characterized spectroscopically by solution (1)H and (13)C NMR, UV-vis and ECD.
Prema
Dipesh
D
Department of Chemistry, Kansas State University, 111 Willard Hall, Manhattan, KS 66506, USA.
Wiznycia
Alexander V
AV
Scott
Benjamin M T
BM
Hilborn
Jessica
J
Desper
John
J
Levy
Christopher J
CJ