| Abstrakt: |
Four new compounds, [Ni(HPO3)(4,4'-bpy)(H2O)3].4H2O (1), [Co2(HPO3)2(4,4'-bpy)2(H2O)6].9H2O (2), [Zn(HPO3)(4,4'-bpy)0.5].H2O (3), and [Co3(PO3)2(4,4'-bpy)3(H2O)6].3H2O (4), have been synthesized. Compounds 1 and 2 are linear chains and isostructural except for the distinction of the metal ion and the number of lattice water molecules. Compound 3 consists of a 2D sheet structure. Compound 4 is a 3D magnetic porous material with 1D channels along the c axis. Magnetic measurements indicate that compound 1 shows paramagnetic behavior, while compound 2 displays antiferromagnetic behavior. Compound 4 exhibits antiferromagnetism with a pronounced field-induced spin-flop transition. A critical field of 3 T at 2.0 K is determined from the derivative dM/dH curve. Meanwhile, compound 4 shows a strong spin frustration arising from the geometric frustration in the kagomé lattice. The dehydrated phase 4a displays a characteristic of N2 adsorption with type II isotherm. We performed detailed magnetic measurements for 4a, which exhibits quite different magnetic properties from 4. Compound 4a displays a ferrimagnetic behavior with a lower transition field of 0.2 T, and a weaker spin frustration. [ABSTRACT FROM AUTHOR] |
