title: Iron(II) and zinc(II) monohelical binaphthyl-salen complexes with overlapping benz[a]anthryl sidearms.
abstract: The synthesis of the polyaromatic aldehyde 1-hydroxybenz[a]anthracene-2-carboxaldehyde is reported via a seven step protocol from 9,10-dihydroanthracene, with an overall yield of 30%. Two equivalents of the aldehyde are condensed with (R)-1,1'-binaphthyl-2,2'-diamine to produce a new binaphthyl-salen ligand, which is subsequently complexed to iron(II) and zinc(II) ions. The ligand and complexes are characterized by single-crystal X-ray crystallography. The complexes have distinct helical structures with overlapping benz[a]anthryl sidearms, and only M-helices are observed. The ligand and complexes are further characterized by solution (1)H and (13)C NMR spectroscopy as well as UV-visible and ECD spectroscopies. These studies indicate that there is a single component in solution, consistent with the solid state characterization.
authors.affiliation: Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Wiznycia
authors.forename: John
authors.initials: J
authors.lastname: Desper
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Levy