A windmill-shaped hexacopper(II) molecule built up by template core-controlled expansion of diaquatetrais(mu(2)-adeninato-N3,N9)dicopper(II) with aqua(oxydiacetato)copper(II)

The windmill-shaped hexanuclear copper(II) cluster {(H2O)(2)Cu-2(mu(3)-(Ade)(4)[Cu(oda)(H2O)](4)}center dot 6H(2)O (1-o) has been synthesized in aqueous medium by in situ core-controlled expansion of the neutral building block Cu-2(mu(2)-N3,N9Ade)(4)(H2O)(2) (2) with Cu(oda)(H2O) (3-o) (Ade = adeninato(1-) and oda = oxydiacetato(2-) ligands). Crystal data for 2-b (2(.)5H(2)O): triclinic, space group P (1) over bar; a = 9.374(1), b = 9.440(1), c = 10.326(1) angstrom; alpha = 78.72(1), beta = 76.77(1), gamma = 63.51 (1)degrees; final R-1 = 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) angstrom; beta = 1 ol.61 (1)degrees; final R-1 = 0.049; T = 293(2) K. The X-shaped hexanuclear molecule consists of a central core (2) and four terminal arms (3-o) linked together by bridging mu(3)N3,N7,N9-Ade ligands. There are three crystallographic independent metal atoms (two terminals, one central). All Cu(II) atoms exhibit a 4 + 1 coordination, of which one is an aqua apical ligand. The basal coordination sets complete the CuN4 + O or CUO3N + O chromophores for the central or terminal metal atoms, respectively. Thermal stability and spectral and magnetic properties were also studied. Analogous compounds to 1-o with tridentate or tripodal tetradentate ligands L2-, instead of oda, have also been synthesized.