A rare example of a double metamagnetic transition leading to 2D and 3D long-range order in the two-dimensional pyrazine- and azido-bridged cobalt(II) compound [Co(pyz)(N 3 ) 2 ].

Authors :: Setifi Z
Setifi F
Benmansour S
Liu X
Mague JT
Gómez-García CJ
Konieczny P
Reedijk J
Source :: Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2022 Apr 05; Vol. 51 (14), pp. 5617-5623. Date of Electronic Publication: 2022 Apr 05.
Publication Year :: 2022
Abstract: The synthesis, characterization, crystal structure and detailed magnetic properties of a pyrazine (pyz) and azido (N <subscript>3</subscript> ) bridged cobalt(II) compound of formula [Co(N <subscript>3</subscript> ) <subscript>2</subscript> (pyz)] (1) are reported. Compound 1 shows a layered structure formed by Co(II) chains with double μ-N <subscript>3</subscript> (κN <superscript>1</superscript> ,N <superscript>1</superscript> ) bridges that are further connected by μ-(pyrazine-κN <superscript>1</superscript> ,N <superscript>4</superscript> ) bridges. The layers present weak van der Waals interactions between azido terminal groups. The magnetic properties show the presence of a metamagnetic behaviour in 1 with two critical fields of 200 and 400 mT at low temperatures. AC magnetic measurements show the presence of a long-range 2D ferromagnetic order at T <subscript>c</subscript> ≈ 8.0-7.0 K for dc fields above 200 mT and a long-range 3D ferromagnetic order at T <subscript>c</subscript> ≈ 4.5 K for dc fields above 400 mT.

Full Text Access

Tools