A cubane-type Cu4O4 core has been found in the title tetrameric copper
(II) complex {tetrakis(mu-3-bromobenzoato)-1 kappa O:2 kappa O';2 kapp
a O:3 kappa O';3 kappa O:4 kappa O';4 kappa O:1 kappa O'-tetrakis [mu-
2-(dimethylamino)ethanolato]-1 kappa N,1:2:3 kappa(3)O;2 kappa N,2:3:4
kappa(3)O;3 kappa N,3:4:1 kappa(3)O;4 kappa N,4:1:2 kappa(3)O-tetraco
pper(II), [Cu-4(C7H4BrO2)(4)(C4H10NO)(4)]} The short Cu-O-ethanolato b
onds form an eight-membered ring folded in a boat-like conformation. T
he Cu Cu distances vary between 3.121 (2) and 3.796 (3) Angstrom. Each
Cu atom has a distorted octahedral environment. Two ethanolato O atom
s, a carboxy O atom and an amino N atom form the equatorial coordinati
on plane, with Cu-O bond lengths in the range 1.914 (12)-1.954 (14) An
gstrom and Cu-N bond lengths in the range 2.011 (12)-2.057 (13) Angstr
om. The axial sites are occupied by an ethanolato O atom and an O atom
of the carboxylate group, with Cu-O distances in the range 2.443 (8)-
2.877 (9) Angstrom.