COPPER(II) COMPLEXES OF HEPTANEDIOIC ACID (HDAH(2)) AND OCTANEDIOIC ACID (ODAH(2)) - X-RAY CRYSTAL-STRUCTURES OF [CU(ETA(2)-HDA)(PHEN)(2)]CENTER-DOT-11.73H(2)O AND [CU(ETA(2)-ODA)(PHEN)2]CENTER-DOT-12H(2)O (PHEN=1,10-PHENANTHROLINE)

The alpha,omega-dicarboxylic acids heptanedioic acid (hdaH(2)) and oct anedioic acid (odaH(2)) reacted smoothly with [Cu-2(mu-O2CCH3)(4)(H2O) (2)] in water giving the insoluble copper(II) complexes [Cu(hda)] (1) and [Cu(oda)] (2). Complexes 1 and 2 reacted further with 1,10-phenant hroline (phen) giving [Cu(eta(2)-hda)(phen)(2)].chi H2O and [Cu(eta(2) -oda) (phen)(2)].chi H2O (chi approximate to 8), respectively. The X-r ay crystal structures of [Cu(eta(2)-hda) (phen)(2)]. 11.73H(2)O (3) an d [Cu(eta(2)-oda)(phen)(2)]. 12H(2)O (4) (i.e. chi = 11.73 and 12, res pectively) reveal that, for each complex, the copper(II) atom is at th e centre of a distorted octahedron comprising four nitrogen atoms from two chelating phen ligands and two oxygen atoms from a single asymmet ric chelating carboxylate function, with the remaining carboxylate gro up of the diacid uncoordinated.