Synthesis and three-dimensional hydrogen-bonded structure of a cobalt(II) complex with 4-Sulfonyl-2,6-naphthalenedicarboxylate

Using the ligand 4-sulfonyl-2,6-riaphthaleriediearboxylate (SNDC), a coordination compound [Co(H ₂O) ₆] ₂ [Co (SNDC) ₂(H ₂O) ₄] • 4H ₂O (1) was synthesized and characterized by elemental analysis, thermal analysis, IR and single crystal X-ray diffraction structure analysis. The complex crystallizes in the triclinic P1 space group. The crystallographic data are: a=0.7224(3) ran, 6 = 1.181 2(4) nm, c=1.353 4(5) nm, v=1.03947(7) nm ³, Z=1, D _e =1.195 g- cm ^-3, R ₁=0.055 8, wR ₂=0.148 7. In the complex, the cobalt(II) mononuclear anion ([Co(SNDC) ₂(H ₂O) ₄]4-) adopts the six-coordinated octahedral geometry furnished by two carboxylate oxygen atoms from the SNDC ligands and four water oxygen atoms. The cobalt (II) mononuclear anions are self-assembled into two-dimensional sheets through hydrogen bonding between coordinated water molecules and carboxylate oxygens and π-π stacking of the aromatic naphthalene moieties. The [Co(H ₂O) ₆] ²⁺ cations are intercalated between the layers through additional hydrogen bonds involving coordinated water molecules and sulfonate/carboxylate oxygen atoms. CCDC: 694556.