The salt [K(18-crown-6)][Mn(H
2O)
2Cr(ox)
3]·0.5(18-crown-6) (
1) has been prepared and structurally and ma
gneticallycharacterized. It crystallizes in the
P2
1/
c space
group [
a = 21.011(2) &Arin
g;,
b = 11.265(2) &Arin
g;,
c = 15.748(3) &Arin
g;,
ges/
gifchars/beta2.
gif" BORDER=0 ALIGN="middle"> =105.952(6)
ges/entities/de
g.
gif">,
V = 3584(1) &Arin
g;
3, and
Z = 4] and contains [Mn(H
2O)
2Cr(ox)
3]
ges/entities/infin.gif"> chains connected throu
gh hydro
genbondin
g to form 2D anionic networks. The ma
gnetic exchan
ge is ferroma
gnetic [
J = +2.23(2) cm
-1] in the chainand also in between chains, reachin
g bulk ferroma
gnetic orderin
g below 3.5 K.