A zipper-like supramolecular double-chain based on 1D pi-pi stacking interactions: Synthesis and crystal structure of [Cu(phen)(C4H4O4)(H2O)](2) center dot C4H6O4 (phen=1,10-phenanthroline)

[Cu(C12H8N2)(C4H4O4)(H2O)](2) . C4H6O4 was prepared by the reaction of succ inic acid, CuCl2 . 2H(2)O, 1,10-phenanthroline (phen=C12H8N2), and Na2CO3 i n a CH3OH-H2O solution. The crystal structure (triclinic, P (1) over bar (n o. 2), a = 7.493(1), b = 9.758(1), c = 13.517(1) Angstrom; alpha = 68.89(1) degrees, beta = 88.89(1)degrees, gamma = 73.32(1)degrees, Z = 1, R = 0.0308 , wR(2) = 0.0799 for 3530 observed reflections (F-o(2) greater than or equa l to 2 sigma(F-o(2)) out of 3946 unique reflections) consists of hydrogen b onded succinic acid molecules and succinato bridged 1 D zipper-like supramo lecular (1)(infinity) [Cu(phen)(C4H4O4)(2/2)(H2O)](2) double chains based o n 1 D pi-pi stacking interactions between the chelating phen systems at dis tances of 3.71 Angstrom and 3.79 Angstrom. The Cu atoms are fivefold trigon al bipyramidally coordinated by two N atoms of the bidentate chelating phen ligand and three O atoms of one water molecule and two bidentate bridging succinate ligands. The water O atom and one phen N atom are at the apical p ositions (equatorial: d(Cu-O) = 1.945, 2.254(2) Angstrom, d(Cu-N) 2.034(2) Angstrom; axial: d(Cu-O) = 1.971(2) Angstrom, d(Cu-N) = 1.995 Angstrom).