抄録
Paramagnetic resonance absorption was investigated at centimeter wave-length region in single crystals of copper propionate monohydrate Cu(CH3CH2COO)2·H2O.
The spectrum obtained is not a normal one expected for a 2D state of Cu++ ions in crystals but similar to that observed in copper acetate monohydrate Cu(CH3COO)2·H2O and more complicated. This spectrum can be explained by an effective spin Hamiltonian with an equivalent spin value S=1. This may lead us to a conclusion that each of the magnetic complexes in this crystal consists of a pair of copper ions under a strong interaction and may be created from a bimolecular structure, Cu2(CH3CH2COO)4·2H2O as in the case of the acetate. The unit cell of this crystal contains six spatially inequivalent pairs, of which three can be derived from the others by a reflection in its ac-plane. Each pair of ions in this crystal is considered to be under a very similar environment, except the direction of the pairs. The rhombicity in its crystalline field is smaller than that of the acetate.
