A fluorescent layered oxalato-based canted antiferromagnet

Abstract

We report the synthesis and characterization of the first fluorescent oxalato-based canted antiferromagnet. Compound [DOC][MnFe(C2O4)3] (1) (DOC = 3,3'-diethyloxacarbocyanine) combines the well-known canted antiferromagnetic [MnFe(C2O4)3]- honeycomb layers with a fluorescent cationic cyanine-type fluorescent dye. Besides the expected spin canted antiferromagnetic order in the oxalato layer at ca. 29 K, we show the key role played by the anionic oxalato lattice in the optical properties of the cation since it provides isolation of dye cations in the hexagonal cavities of the oxalato-based matrix. The emission of the DOC+ dye shows a redshift and a broadening of the emission as well as an increase in the lifetime compared to the emission of the DOC+ cations in solution. These facts are attributed to the isolation effect of the oxalato-based matrix.

Insertion of single-ion magnets based on mononuclear Co(ii) complexes into ferromagnetic oxalate-based networks

“…They are formed by 2D 3 or 3D 4 anionic magnetic networks, which can host different functional cations. 5,6 These compounds combine the cooperative magnetism of the oxalate network with paramagnetism, 7 photochromism, 8 electrical conductivity, 9 proton conductivity, 10 ferroelectricity, 11 chirality, 12 spin-crossover (SCO) 13 or fluorescence 14 from the counter-cation. In these structures the dimensionality of the coordination network is controlled by the relative configuration of the adjacent metal ions linked by an oxalate bridge.…”

Chloranilato-Based Layered Ferrimagnets with Solvent-Dependent Ordering Temperatures

“…In this series, the magnetic exchange through the CN bridge can be modulated [5,6] by changing A, M, and M' to obtain materials with interesting magnetic properties as photomagnetism [7][8][9], single molecule magnets [10,11], and even magnetic order above room temperature [12]. Another family of molecule-based magnets whose properties can be easily modified by changing the constituent metallic atoms is the series of oxalato-based two-dimensional (2D) magnets with T c ranging from 6 K to 48 K depending on M(II) and M(III) [13][14][15][16][17][18][19][20][21][22]. A third and recent example is the series of anilato-based heterometallic 2D honeycomb magnets formulated as (A)[M II M III (C 6 O 4 X 2 ) 3 ]•G, where A + is a monocation (see Table 1); M(II) and M(III) are transition metal ions as Mn(II), Fe(II), Cr(III), and Fe(III), G may be many different solvent molecules (see Table 1), and C 6 O 4 X 2 2− is the 1,3-disubstituted-2,5-dihydroxy-1,4-benzoquinone dianion (with X = H, Cl, Br, NO 2 , .…”