Molecular copper-barium compounds. Syntheses, crystal structures, and magnetic properties of two sandwich copper-barium complexes: BaCu4(bdmap)4(PyO)4(O2CCF3)2.0.5THF and BaCu4(deae)4(PyO)4(O2CCF3)2 (bdmap = 1,3-bis(dimethylamino)-2-propanolato, PyO = deprotonated 2-hydroxypyridine, deae = 2-(diethy