Comparative magnetic studies of (Sm, Nd) trichloroacetates and their heteronuclear CuLn2(CCl3COO)8·6H2O systems: structure and spectroscopy of a new type of Eu trichloroacetate

Magnetic studies of lanthanide complexes with amino acids

“…The progressive decrease of χ M T on lowering the temperature is mainly caused by depopulation of the excited states. Similar magnetic behaviour was observed by us for polynuclear europium trichloroacetate build of infinite chains, which may be though to consist of dimeric Eu-Eu units [5].…”

“…Legendziewicz). simultaneously 4f and 3d metal centers [3][4][5][6][7][8][9][10][11][12][13]. In contrast to this, the number of reports concerning Ln-Ln interactions in molecular magnetic materials is still limited [3][4][5][6][7][14][15][16][17][18][19][20][21].…”

A Solvate‐Isolated Linear Trimer CuNd2(CCl3COO)8 ⋅ 6MeCN: Structure, Synthesis and Magnetic Behavior

“…It should be mentioned that the similar Curie-Weiss behavior of χ(T) was observed by authors of [6] in the spin-chain compound CuNd 2 (CCl 3 COO) 8 • 6H 2 O with the slightly higher Weiss constant Θ equal to À 40 K. It was explained by AFM exchange correlations in NdÀ CuÀ Nd chains. The detailed comparison of magnetic properties of spin-chain compound CuNd 2 (CCl 3 COO) 8 • 6H 2 O and presented here linear trimer CuNd 2 (CCl 3 COO) 8 • 6MeCN is not reliable because of principle differences in their magnetic structures.…”

“…The complex exists as discrete units instead of the bimetallic hydrate of these elements, CuLn 2 (CCl 3 COO) 8 • 6H 2 O, which has infinite chained structure. [6,16] Compound 1 crystallizes in the tetragonal space group I4 as a complex molecular structure (Figure 2). One shows two distinct coordinated neodymium sites and one copper site located on symmetry element (4-fold axis).…”

“…The combination of 3d-and 4f-elements in various coordination in the same compound leads to highly unusual and almost unpredictable magnetic behavior because of the difficult picture of crystal field splitting for both 4f-and 3d-ions and poorly investigated microscopic magnetic interactions mechanism between the d-f metal centers. [5][6][7][8] A few years earlier, Wojciechowski et al [6] expanded the series of CuLn 2 (CCl 3 COO) 8 • 6H 2 O (Ln=Sm, Nd) and demonstrated that the formation of a chain structure is possible due to the bonding of the metal atoms via carboxylate anions. The use of a solvent with lower donor properties (in comparison to water) leads to the preferred solvation with the trichloroacetate ligands, and the possibility of the formation of new structural fragments appears; therefore, in this work, we used N-donor acetonitrile.…”