| Popis: |
(i) The magnetic properties of the series of a layered material, Cu2(OH)3(n-C m H2m+1COO), are found to show an anomalous change, depending on the alkyl-chain length: the m=0 and 1 materials are metamagnetic while the m=7–9 materials become weak ferromagnets below 22 K. Further, 4- phenylazobenzoate and 2-anthracene carboxylate, which are derivatives of well- known photo-functional molecules, are intercalated into the copper hydroxides. The obtained materials are both antiferromagnetic in the whole temperature range of 3–280 K. However, the photochemical reactions do not take place by irradiation with a xenon lump, (ii) The magnetic properties of the layered perovskite ferromagnets (p-cyanoanilinium+)2CuCl4 2- and (p- chloroanilinium+)2CuBr4 2- are studied under hydrostatic high pressure of 1.0 GPa. Above Tc , they show an increase of the magnetization, which would due to enhancement of the ferromagnetic coupling, but, below Tc , they show different magnetic response to the pressure. |
