Synthesis and Crystal Structure of a Novel Dinuclear Copper(II) Complex, [Cu2(phen)2(H2O)2(OH)2](HCO3)2 · 6 H2O with phen = 1,10-phenanthroline

Abstract

Dark blue plate‐like crystals of [Cu2(phen)2 · (H2O)2(OH)2](HCO3)2 · 6 H2O were obtained from a CH3OH–H2O solution containing CuCl2, 1,10‐phenanthroline (phen), sebacic acid and Na2CO3. The crystal structure (triclinic, P 1 (no. 2), a = 8.118(1), b = 9.624(1), c = 10.536(1) Å, α = 81.35(1)°, β = 88.51(1)°, γ = 75.77(1)°, Z = 1, R = 0.0332, wR2 = 0.0981 for 4163 observed reflections (F $^2_o$ ≥ 2σ(F $^2_o$) out of 4595 unique reflections) consists of divalent [Cu2(phen)2(H2O)2(OH)2]2+ complex cations, anionic (HCO3)22– dimers and H2O molecules. The divalent complex cations (d(Cu…Cu) = 2.905(1) Å) are centered at inversion centers. The Cu atoms are fivefold square‐pyramidally coordinated by two nitrogen and three oxygen atoms from one bidentate chelating phen ligand, two bridging hydroxide groups and one axial water molecule (d(Cu–N)phen = 2.021(2), 2.024(2) Å; d(Cu–O)OH = 1.941(1), 1.949(1) Å; d(Cu–O)H2O = 2.254(2) Å). The divalent complex cations are stacked to form 2 D layers parallel (001) with 1 D π‐π stacking interactions along [100] via the terminal phen rings. The dimeric (HCO3)22– anions and the hydrogen bonded H2O molecules are sandwiched between the 2 D layers.

Di-μ-hydroxo-bis[aqua(1,10-phenanthroline-κ2N,N′)copper(II)] terephthalate octahydrate

“…Because of inversion symmetry, the two apical water molecules are in a trans conformation. This dinuclear cation is similar to others reported previously (Zheng et al, 2000;Lu et al, , 2004. The CuÁ Á ÁCu distance of 2.911 (3) Å in (I) is longer than that found in [Cu 2 (C 12…”

“…[2.902 (1) Å ; Zheng et al, 2000;Lu et al, 2004] and shorter than that found [2.933 (1) Å ] by Lu et al (2003).…”