Structural diversity of nickel and manganese chloride complexes with pyridin-2-one

Abstract

Reactions of NiCl$_2$·6H$_2$O and pyridin-2-one (C$_5$H$_5$NO = Hhp) afforded novel molecular complexes, i.e., mononuclear [NiCl$_2$(Hhp)$_4$] (1), dinuclear [NiCl$_2$(Hhp)(H$_2$O)$_2$]$_2$·2Hhp (3) and [Ni$_2$Cl$_4$(Hhp)$_5$]·2MeCN (4), and an ionic complex [Ni(Hhp)$_6$]Cl$_2$ (2). Single-crystal X-ray analyses revealed two modes of Hhp ligation in these complexes: a monodentate coordination of carbonyl oxygen in all of them and an additional µ$_2$-oxygen bridging coordination in the dinuclear complex 4. Three bridging molecules of Hhp span two nickel(II) ions in 4 with a 2.9802 (5) Å separation of the metal ions. Complex 3 is a chlorido-bridged nickel dimer with a planar Ni$_2$(µ-Cl)$_2$ framework. Hydrogen bonds and parallel stacking arrangements of the Hhp molecules govern the connectivity patterns in the crystals, resulting in 1D structures in 1 and 5 or 2D in 3. A single manganese compound [MnCl$_2$(Hhp)$_4$] (5), isostructural to 1, was isolated under the similar conditions. This is in contrast to four nickel(II) chloride complexes with Hhp. Thermal analyses proved the stability of complexes 1 and 3 in argon up to 145 °C and 100 °C, respectively. The decomposition of 1 and 3 yielded nickel in argon and nickel(II) oxide in air at 800 °C.

Keywords

kompleksi Ni(II);komplekis Mn(II);piridin-2-on;O-mostovni ligandi;kristalna struktura;termična obstojnost;Ni(II) complexes;Mn(II) complexes;pyridin-2-one;O-bridging ligand;crystal structure;thermal stability;

Data

Language:	English
Year of publishing:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
UDC:	546.712:546.742:547.821
COBISS:	1538537155
ISSN:	1420-3049
Views:	193
Downloads:	66
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	kompleksi Ni(II);kompleksi Mn(II);piridin-2-on;O-mostovni ligandi;kristalna struktura;termična obstojnost;
Type (COBISS):	Article
Pages:	str. 1-23
Volume:	ǂVol. ǂ25
Issue:	ǂiss. ǂ4
Chronology:	Feb. 2020
DOI:	10.3390/molecules25040846
ID:	13943497