Magnetic behaviour of bimetallic layered phases M'0.2Mn0.8PS3·0.25 H2O (M' = ZnII, CuII, NiII, CoII)

In this work the magnetic properties of bimetallic phases M'_0.2Mn_0.8PS₃·0.25H₂O (M' = Co^II, Ni^II, Cu^II or Zn^II) have been explored and compared with those of the pristine phase MnPS₃. Magnetic susceptibility, high field magnetization and electron paramagnetic resonance (EPR) studies reveal that the transition temperature between the antiferromagnetic and paramagnetic order for the pristine phase is shifted to lower values in the bimetallic phases. From magnetization measurements the critical field of the spin-flop transition is found to be dependent on the nature of the added secondary transition metal ion. EPR spectra of all compounds in the temperature range of 8-300 K present a single resonance line shape. Temperature dependence of the EPR parameters, like line width, g values and double integrated area (I_DIN), are obtained from the spectra and present a scenario compatible with the magnetization results. The temperature dependence of the first derivative of the product (I_DINT) shows two maxima for all samples, with exception of the Co^II phase, indicating two critical temperatures, while these critical temperatures could not be clearly determined by dc susceptibility.

Magnetic properties of composites based on the intercalation of ZnII and CuII bimetallic macrocyclic complexes in the MnPS3 phase

EPR and magnetic susceptibility data of composites based on MnPS₃ show the influence of the intercalated species on their magnetic properties.

Solvent Effects on the IR Spectra of N-Methylacetamide

The solvent effect on the v(N-H) amide I and amide II IR bands of N-methylacetamide were investigated. The frequency shifts could be related to the solvent donor and acceptor num-bers by mean of a two parameters relationship that accounts for the mutual influence between the two interacting sites of the amide.