title: Selective complexation of 3d metal(II) ions with multidentate and chiral isomers derived from condensation of 2-pyridinecarboxaldehyde with triethylenetetramine.
abstract: Condensation of 2-pyridinecarboxaldehyde with a stoichiometric amount of triethylenetetramine in isopropyl alcohol yields a mixture of at least two products, a Schiff dibase L(1) and a cyclization product with two imidazolidine rings L(2), and possibly a Schiff monobase with one imidazolidine ring L(3). The 3d metal(II) salts, Mn(SCN)(2), MnCl(2), CuBr(2), MnI(2) and ZnBr(2), react selectively with L(1) or L(2) in this mixture solution to produce Mn(L(2))(NCS)(2) 1, Mn(L(2))Cl(2) 2, [Cu(L(2))Br]Br x H(2)O 3, [Mn(L(1))]I(2) 4, and [Zn(L(1))][ZnBr(4)] 5 , respectively. The presence of the two imidazolidine rings in the coordinated ligand L(2) of 1-2 generates two chiral carbon centers. The Mn(II) ion coordinates stereo-selectively to the [R,R] or [S,S] form of the L(2) in hexa-coordinate Mn(II) compounds 1 and 2, whereas the Cu(II) ion coordinates with the meso [R,S] form of L(2) in 3.
authors.affiliation: Department of Chemistry and Nano Science, Center for Biomimetic Systems, Ewha Womans University, Seoul, 120-750, Korea.
authors.forename: Yong-Min
authors.initials: YM
authors.lastname: Lee
authors.forename: Eun-Sook
authors.initials: ES
authors.lastname: Kim
authors.forename: Hee-Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hee Jung
authors.initials: HJ
authors.lastname: Choi
authors.forename: Young-Inn
authors.initials: YI
authors.lastname: Kim
authors.forename: Sung Kwon
authors.initials: SK
authors.lastname: Kang
authors.forename: Sung-Nak
authors.initials: SN
authors.lastname: Choi
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D011725:Pyridines / Q000737:chemistry*; D013237:Stereoisomerism; D014266:Trientine / Q000737:chemistry*
chemical_list: D008670:Metals; D011725:Pyridines; C522921:picolinaldehyde; D014266:Trientine