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Low-dimensional compounds containing cyanido groups. Part XXXV. Structure, spectral, thermal and magnetic properties of a binuclear Cu II -biquinoline complex with bridging and terminal dicyanamide ligands.

Authors :
Potočňák I
Bukrynov O
Ráczová K
Čiǽmár E
Vitushkina S
Váhovská L
Dušek M
Štarha P
Source :
Acta crystallographica. Section C, Structural chemistry [Acta Crystallogr C Struct Chem] 2018 Nov 01; Vol. 74 (Pt 11), pp. 1469-1476. Date of Electronic Publication: 2018 Oct 23.
Publication Year :
2018

Abstract

From the system CuCl <subscript>2</subscript> -biq-NaN(CN) <subscript>2</subscript> (biq is 2,2'-biquinoline), the binuclear molecular complex bis(μ-dicyanamido-κ <superscript>2</superscript> N <superscript>1</superscript> :N <superscript>5</superscript> )bis[(2,2'-biquinoline-κ <superscript>2</superscript> N,N')(dicyanamido-κN <superscript>1</superscript> )copper(II)], [Cu <subscript>2</subscript> (C <subscript>2</subscript> N <subscript>3</subscript> ) <subscript>4</subscript> (C <subscript>18</subscript> H <subscript>12</subscript> N <subscript>2</subscript> ) <subscript>2</subscript> ] or [Cu <subscript>2</subscript> (biq) <subscript>2</subscript> (dca) <subscript>2</subscript> (μ <subscript>1,5</subscript> -dca) <subscript>2</subscript> ] (1) [dca is dicyanamide, N(CN) <subscript>2</subscript> <superscript>-</superscript> ] was isolated and characterized by crystal structure analysis, and spectral, thermal and magnetic measurements. IR spectroscopy confirmed the presence of the biq and dca ligands in 1. Its solid-state structure consists of discrete centrosymmetric binuclear copper(II) units with double end-to-end dca bridges. Each Cu <superscript>II</superscript> atom is in a distorted square-pyramidal environment with the equatorial plane formed by two nitrile N atoms from bridging dca groups, one of the two N atoms of the chelate biq molecule and one nitrile N atom from a terminal dca ligand, whereas the second biq N atom occupies the axial position. Thermal decomposition of 1 in an air atmosphere proceeds gradually, with copper(I) cyanide being the final decomposition product. Magnetic measurements revealed the formation of alternating spin chains and a relatively strong exchange interaction within the binuclear units was also confirmed by Broken Symmetry DFT (density functional theory) calculations.

Details

Language :
English
ISSN :
2053-2296
Volume :
74
Issue :
Pt 11
Database :
MEDLINE
Journal :
Acta crystallographica. Section C, Structural chemistry
Publication Type :
Academic Journal
Accession number :
30398203
Full Text :
https://doi.org/10.1107/S205322961801375X