Structural properties of some dimeric Cu(I) 1,2-bis(diphenylphosphino)ethane complexes with carboxy- and dithiocarboxy-arylates. X-ray crystal structures of [bis(benzoato-O)-bis{1,2-bis(diphenylphosphino)ethane}-mu-1,2-bis(diphenylphosphino)ethanedicopper(I)].4H(2)O and [bis(dithio-o-toluato,SS')-bis{mu-1,2-bis(diphenylphosphino)ethane}dicopper(I)]

The X-ray diffraction structures of [{Cu(O2CC6H5) dppe}(2)-mu-dppe] . 4H(2)O (I) and [{Cu(S2C-o-tolyl)-mu-dppe}(2)] (II) (dppe = 1,2-bis( diphenylphosphino)ethane) are reported. Crystals of I are monoclinic, space group C-2/c, with a = 27.690(3), b = 14.903(2), c=22.013(3) Angstrom, beta = 106.68(2)degrees, Z=4; crystals of II are monoclinic, space group P2(1)/n, with a = 12.082(4), b = 21.952(7), c= 13.028(5) Angstrom, beta = 112.91(2)degrees, Z= 2, Both I and II compounds consist of dinuclear centrosymmetric complexes with the Cu(I) ions bridged by one dppe in I and by two dppe in IT. The distorted tetrahedral coordination around the Cu(I) ions, observed in both compounds, is completed in I by the P atoms of a chelating dppe and the O atom of a monodentate benzoato and in II by the S atoms of a chelating dithio-o-toluato.