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  • Title: Selective complexation of 3d metal(II) ions with multidentate and chiral isomers derived from condensation of 2-pyridinecarboxaldehyde with triethylenetetramine.
    Author: Lee YM, Kim ES, Kim HJ, Choi HJ, Kim YI, Kang SK, Choi SN.
    Journal: Dalton Trans; 2009 Jan 07; (1):126-33. PubMed ID: 19081980.
    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.
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