Crystal structures of three zinc(II) halide coordination complexes with quinoline N-oxide
Open Access
- 10 June 2022
- journal article
- research article
- Published by International Union of Crystallography (IUCr) in Acta Crystallographica Section E Crystallographic Communications
- Vol. 78 (7) , 716-721
Abstract
The reaction of one equivalent of zinc(II) halide with two equivalents of quinoline N-oxide (QNO) in methanol yields compounds as ZnX 2(QNO)2, where X = Cl (I), Br (II) and I (III), namely, dichloridobis(quinoline N-oxide-κO)zinc(II), [ZnCl2(C9H7NO)2], dibromidobis(quinoline N-oxide-κO)zinc(II), [ZnBr2(C9H7NO)2], and diiodidobis(quinoline N-oxide-κO)zinc(II) [ZnI2(C9H7NO)2]. In all three complexes, Zn cations are coordinated by two QNO ligands bound through the oxygen atoms and two halide atoms, with X—Zn—X bond angles ca 20° wider than the O—Zn—O, giving rise to a distorted tetrahedral geometry. Crystals of (II) and (III) are isostructural and both show pairwise π-stacking of QNO ligands and weak C—H...X hydrogen bonds, while (I) packs differently, with a shorter C—H...Cl bond and without π-stacking.Keywords
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