Structure and a 1/2-Like Magnetization Plateau in a S_eff = 1/2 Skew Chain Compound [Co₂(CH₃O-ip)(COOH)₂(H₂O)]_n

Abstract

] n is successfully synthesized by the hydrothermal reaction method. The compound crystallizes in the monoclinic structure with space group P2 1 /c, in which two inequivalent Co ions, bridged by a μ 2 -O monodentate formic acid ligand group, form one-dimensional skew chains along the b axis. The magnetic susceptibility and specific heat data indicate that the compound undergoes two magnetic phase transitions at T N1 = 5.8 K and T N2 = 6.6 K, respectively. Interestingly, the magnetization curve at 2 K presents a 1/2-like magnetization plateau based on the analysis of Hamiltonian diagonalization.

Analogous Chain Selenite Chlorides Ba2M(SeO3)2Cl2 (M = Cu2+, Ni2+, Co2+, Mn2+) and Pb2Cu(SeO3)2Cl2 with Tunable Spin S: Syntheses and Characterizations

“…Figure b shows the ZFC and FC curves measured from 2 to 40 K under different magnetic fields for compound 4 . As the applied field increased, the AFM ordering at 5.7 K was suppressed above 3 T, similar to that observed in the compound Mn 3 (SeO 3 ) 3 H 2 O. ,,, Moreover, in order to confirm the occurrence of the AFM LRO of 4 , the temperature-dependence ESR measurement was conducted. As shown in Figure b, similar to 3 , a single paramagnetic peak at 40 K persisting down to 10 K changes into multiple peaks at 2 K, confirming the LRO state of 4 at 2 K. However, the long-range order in 3 may still need to be further confirmed by other techniques later including neutron diffraction.…”

“…For example, the spin-Peierls transition is observed in CuGeO 3 and NaV 2 O 5 with S = 1/2. , While the screw chain compounds ACo 2 V 2 O 8 (A = Ba, Sr, Pb) with S = 3/2 exhibit various exotic phenomena with spinon confinement, topological excitations, and Bethe strings. − In addition, a nearly ideal 1D chain compound FeF 3 (4,4′-bpy) (4,4′-bpy = 4,4′-bipyridyl) with S = 5/2 shows strong interactions within spin chain, and Fe 2 (TeO 3 ) 2 (SO 4 )·3H 2 O with S = 5/2 exhibits spin-flop transition . Moreover, several compounds with 1D spin chain structures including Cu 3 (CO 3 ) 2 (OH) 2 ( S = 1/2), BiCu 2 PO 6 ( S = 1/2), Sr 3 NiIrO 6 ( S = 1), CaNi 3 P 4 O 14 ( S = 1), Co 3 (BPO 4 ) 2 (PO 4 )­(OH) 3 ( S = 3/2), CaCo 2 O 6 ( S = 3/2), Co 2 (CH 3 O-ip)­(COOH) 2 (H 2 O) ( S = 3/2), and SrMn 3 P 4 O 14 ( S = 5/2) show a step-like magnetization plateau curve. However, these experimental systems are independent of different crystal structures.…”

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

“…19,20 The short magnetic bridging ligands such as carboxylate, pyrazole, azide, and cyanide are excellent candidates for constructing magnetic materials. [21][22][23][24][25][26][27][28] They can effectively transmit magnetic interactions between neighboring paramagnetic centers. In addition, the Cu-L-Cu angle (L = bridging atom), Cu-L-L-Cu torsion angle, and dihedral angle (g) between the coordination planes of Cu(II) centers can affect the sign and magnitude of exchange interactions.…”