20.500.12556/RUL-131879 Crystal chemistry of zinc quinaldinate complexes with pyridine-based ligands Substitution of methanol in [Zn(quin)$_2$(CH$_3$OH)$_2$] (quin$^−$ denotes an anionic form of quinoline-2-carboxylic acid, also known as quinaldinic acid) with pyridine (Py) or its substituted derivatives, 3,5-lutidine (3,5-Lut), nicotinamide (Nia), 3-hydroxypyridine (3-Py-OH), 3-hydroxymethylpyridine (3-Hmpy), 4-hydroxypyridine (4-Py-OH) and 4-hydroxymethylpyridine (4-Hmpy), afforded a series of novel heteroleptic complexes with compositions [Zn(quin)$_2$(Py)$_2$] (1), [Zn(quin)$_2$(3,5-Lut)$_2$] (2), [Zn(quin)$_2$(Nia)$_2$]·2CH$_3$CN (3), [Zn(quin)$_2$(3-Py-OH)$_2$] (4), [Zn(quin)$_2$(3-Hmpy)$_2$] (5), [Zn(quin)$_2$(4-Pyridone)] (6) (4-Pyridone = a keto tautomer of 4-hydroxypyridine), and [Zn(quin)$_2$(4-Hmpy)$_2$] (7). In all reactions, the {Zn(quin)$_2$} structural fragment with quinaldinate ions bound in a bidentate chelating manner retained its structural integrity. With the exception of [Zn(quin)$_2$(4-Pyridone)] (6), all complexes feature a six-numbered coordination environment of metal ion that may be described as a distorted octahedron. The arrangement of ligands is trans. The coordination sphere of zinc(II) in the 4-pyridone complex consists of only three ligands, two quinaldinates, and one secondary ligand. The metal ion thereby attains a five-numbered coordination environment that is best described as a distorted square-pyramid (τ parameter equals 0.39). The influence of substituents on the pyridine-based ligand over intermolecular interactions in the solid state is investigated. Since pyridine and 3,5-lutidine are not able to form hydrogen-bonding interactions, the solid state structures of their complexes, [Zn(quin)$_2$(Py)$_2$] (1) and [Zn(quin)$_2$(3,5-Lut)$_2$] (2), are governed by π···π stacking, C–H···π, and C–H···O intermolecular interactions. With other pyridine ligands possessing amide or hydroxyl functional groups, the connectivity patterns in the crystal structures of their complexes are governed by hydrogen bonding interactions. Thermal decomposition studies of novel complexes have shown the formation of zinc oxide as the end product. zinc(II) complexes quinaldinic acid pyridine hydroxyl group crystal structure hydrogen bond kompleksi cinka(II) kinaldinska kislina piridin hidroksilna skupina kristalna struktura vodikova vez true false true Angleški jezik Slovenski jezik Članek v reviji 2021-10-05 13:44:19 2021-10-05 13:44:21 2022-09-10 04:14:20 0000-00-00 00:00:00 2018 0 0 22 str. iss. 1, art. 52 Vol. 8 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 546.47:547.82:548 2073-4352 10.3390/cryst8010052 1538074819 RAZ_Modec_Barbara_2018.pdf RAZ_Modec_Barbara_2018.pdf 1 FAF6C1091F5C4F24933F288941FA27D2 14821192da137795fe503f7f89971ba6badc8412edc590d40dd06208d7dfdd86 42100dd7-25d2-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=149318 https://www.mdpi.com/2073-4352/8/1/52 0 49c2779b-25d1-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=149317 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0