The windmill-shaped hexanuclear copper(II) cluster {(H
2O)
2Cu
2(
3-(Ade)
4[Cu(oda)(H
2O)]
4}·6H
2O (
1-o) has beensynthesized in aqueous medium by in situ core-controlled expansion of the neutral building block Cu
2(
2-N3,N9-Ade)
4(H
2O)
2 (
2) with Cu(oda)(H
2O) (
3-o) (Ade = adeninato(1-) and oda = oxydiacetato(2-) ligands). Crystal datafor
2-b (
2·5H
2O): triclinic, space group P
;
a = 9.374(1),
b = 9.440(1),
c = 10.326(1) Å;
= 78.72(1),
=76.77(1),
= 63.51(1)
; final
R1 = 0.059;
T = 100(2) K. Crystal data for
1-o: monoclinic, space group
P2
1/
n;
a= 15.203(2),
b = 10.245(1),
c = 19.094(2) Å;
= 101.61(1)
; final
R1 = 0.049;
T = 293(2) K. The X-shapedhexanuclear molecule consists of a central core (
2) and four terminal arms (
3-o) linked together by bridging
3-N3,N7,N9-Ade ligands. There are three crystallographic independent metal atoms (two terminals, one central). AllCu(II) atoms exhibit a 4 + 1 coordination, of which one is an aqua apical ligand. The basal coordination setscomplete the CuN
4 + O or CuO
3N + O chromophores for the central or terminal metal atoms, respectively. Thermalstability and spectral and magnetic properties were also studied. Analogous compounds to
1-o with tridentate ortripodal tetradentate ligands L
2-, instead of oda, have also been synthesized.