Magnetic properties of chain-like structures based on Cu(II)

The study of magnetic properties of the polymeric compounds Cu(C2H8N2)(2)Ni (CN)(4), Cu(C2H8N2)(2)Ag-2(CN)(4) and Cu(C10H8N2)(2)Ag-2(CN)(4).H2O is the main purpose of this work. Magnetization measurements at 4.2 K in fields up to 6 T confirmed assumptions on weak exchange interactions, resulting from the knowledge of a crystal structure. Specific heat studies performed in t he temperature range 50 mK-1.5 K revealed phase transitions into the long-r ange-order in milikelvin region in all compounds. The deviations from assum ed chain-like behaviour are discussed.