Wydział Chemii

W. Wojciechowski

Janina Legendziewicz

Małgorzata Puchalska

Zbigniew Ciunik

2004

Journal of Alloys and Compounds

380

285-295

10.1016/j.jallcom.2004.03.056

Naukowa

Angielski

Artykuł

Two series of compounds: heteronuclear CuLn₂(CCl₃COO)₈·6H₂O (Ln = Nd and Sm) and their simple analogues Ln(CCl₃COO)₃·2H₂O (Ln = Eu, Nd, Sm) were synthesized. New Eu(III) trichloroacetate; Eu(CCl₃COO)₃·3H₂O·CH₃OH was obtained, its molecular structure was determined by X-ray diffraction and compared with the data of respective systems reported earlier. Magnetization was measured and the susceptibility was derived in the limit of low field. Magnetic susceptibilities were calculated and discussed for series of homo- and hetero-nuclear chloroacetates. Untypical hysteresis was found (two loops) in samarium trichloroacetate. This phenomenon is most probably the effect of flops of spins in magnetic fields of 30,000 Oe and very weak (if any) interaction intermediated by weak hydrogen bonding between the chains. A similar magnetic behavior was observed in neodymium carboxylate where the magnetic ordering was observed as a result of Nd–Nd interaction at low temperature (1.6 K). For this system, the magnetic moment depends on magnitude of the magnetic field and ferromagnetic ordering appears at low temperatures. The strongest interactions of coupled ions and antiferromagnetic ordering with T_N=6.5 K were found in CuSm₂(CCl₃COO)₈·6H₂O single crystals.Heisenberg model was applied in the calculations for three interacting ions located linearly. The following relation was derived:obtained results.

(Sm, Nd) trichloroacetates, CuLn2(CCl3COO)8, 6H2O, Eu(III) trichloroacetate, Structure, Magnetism, Spectroscopy

https://doi.org/10.1016/j.jallcom.2004.03.056

http://www.elsevier.com