Crystal chemistry of zinc quinaldinate complexes with pyridine-based ligands

Modec, Barbara (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: zinc(II) complexes, quinaldinic acid, pyridine, hydroxyl group, crystal structure, hydrogen bond
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2018
• Št. strani: 22 str.
• Številčenje: Vol. 8, iss. 1, art. 52
• PID: 20.500.12556/RUL-131879
• UDK: 546.47:547.82:548
• ISSN pri članku: 2073-4352
• DOI: 10.3390/cryst8010052
• COBISS.SI-ID: 1538074819
• Datum objave v RUL: 05.10.2021

Gradivo je del revije

• Naslov: Crystals
• Skrajšan naslov: Crystals
• Založnik: MDPI
• ISSN: 2073-4352
• COBISS.SI-ID: 36677893

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 19.01.2018

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kompleksi cinka(II), kinaldinska kislina, piridin, hidroksilna skupina, kristalna struktura, vodikova vez

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P1-0134
• Naslov: Kemija za trajnostni razvoj