110.
The metal ion distribution on the two metal sites of monoclinic Mn
1?xCu
x(HCOO)
2 · 2(H,D)
2O mixed crystals are studied by infrared and Raman spectroscopic methods. The spectral regions 3 200–3 400 cm
?1 (
vOH), 2 875–2 990 cm
?1 (
vCH), 2 330–2 500 cm
?1 (
vOD of matrix isolated HDO molecules), 1 350–1 400 cm
?1 (symmetric CO
2 stretching modes), 570–950 cm
?1 (H
2O librations), and 490 cm
?1 (M? O lattice modes) are mostly sensitive to the metal ions present. The frequency shifts of these bands with increasing content of copper show that Cu
2+ prefers the M(1) site, coordinated by HCOO
? only. The strengths of the hydrogen bonds increase on going from manganese to copper formate, due to the increased synergetic effect of Cu
2+. Solubility and X-ray data of the mixed crystals are included. Irrespective of the same crystal structure, two series of mixed crystals are formed: eutonic area at 0.65 ≥ x ≥ 0.5.
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