Syntheses, Characterization, and Crystal Structures of Bromido-Coordinated Zinc(II) Complexes With Multidentate Schiff Bases

<div><p>A new dinuclear bromido-coordinated Schiff base zinc(II) complex, [Zn<sub>2</sub>Br<sub>2</sub>L<sup>1</sup>(MeOH)]·MeOH (1), and a new mononuclear bromido-coordinated Schiff base zinc(II) complex, [ZnBr<sub>2</sub>L<sup>2</sup>] (2), where L<sup>1</sup> is the dianionic form of <i>N,N’</i>-bis(5-fluoro-2-hydroxybenzylidene)propane-1,3-diamine (H<sub>2</sub>L<sup>1</sup>), and L<sup>2</sup> is the zwitterionic form of 2-[(3-dimethylammoniopropylimino)methyl]-4-fluorophenol, have been preprared and characterized mainly by single-crystal X-ray diffraction. Complex 1 crystallizes in the monoclinic space group <i>P</i>2<sub>1</sub>/<i>n</i> with unit cell dimensions <i>a</i> = 10.0876(9) Å, <i>b</i> = 8.9549(8) Å, <i>c</i> = 26.586(2) Å, β = 95.134(2)º, V = 2391.9(4) Ǻ<sup>3</sup>, Z = 4, <i>R</i><sub>1</sub> = 0.0547, and <i>wR</i><sub>2</sub> = 0.1025. Complex 2 crystallizes in the monoclinic space group <i>P</i>2<sub>1</sub>/<i>c</i> with unit cell dimensions <i>a</i> = 7.359(1) Å, <i>b</i> = 13.798(2) Å, <i>c</i> = 17.676(2) Å, β = 114.602(2)º, V = 1631.8(4) Ǻ<sup>3</sup>, Z = 4, <i>R</i><sub>1</sub> = 0.0877, and <i>wR</i><sub>2</sub> = 0.2197. The inner Zn atom in 1 is five-coordinated in a square pyramidal geometry. The outer Zn atom in 1 and the Zn atom in 2 are four-coordinated in tetrahedral geometry. The crystals of the complexes are stabilized by intermolecular hydrogen bonds.</p></div>