Abstract
The title compound, [Mn(H(2)dondc)(H(2)O)(4)] (n) or [Mn(C(12)H(6)O(6))(H(2)O)(4)] (n) , was synthesized by the reaction of manganese(II) chloride (MnCl(2)), 1,5-dihy-droxynaphthalene-2,6-di-carb-oxy-lic acid (H(4)dondc) and lithium hydroxide (LiOH). The asymmetric unit comprises half of an Mn(II) ion, half of a 1,5-dihy-droxynaphthalene-2,6-di-carboxyl-ate dianion (H(2)dondc(2-)) and two water mol-ecules. The Mn(II) ion is located on a crystallographic inversion center and exhibits a six-coordinated MnO(6) octa-hedral geometry. The octa-hedron is comprised of two oxygen atoms from the two H(2)dondc(2-) ligands and four oxygen atoms from the water mol-ecules. The carboxyl-ate group and naphthalene moiety lie almost coplanar to each other and show a monodentate coordination to the Mn(II) ion. The planar H(2)dondc(2-) ligands bridge Mn(II) ions to form a one-dimensional chain along the diagonal direction of the b and c axes. In the crystal, there are two types of intra-chain hydrogen-bonding inter-actions. The first is between the phenolic hydroxyl groups and carboxyl-ate groups. The phenolic hydroxyl groups of the ligand are protonated and act as intra-chain hydrogen-bonding donors to coordinated oxygen atoms of the carboxyl-ate groups. The other is between coordinated water mol-ecules and non-coordinated oxygen atoms of the carboxyl-ate groups. The parallel chains are connected not only by inter-chain hydrogen-bonding inter-actions between coordinated water mol-ecules and phenolic hydroxyl groups but also by inter-chain hydrogen-bonding inter-actions between coordinated water mol-ecules to give two-dimensional networks. The chains are further connected by inter-chain π-π stacking inter-actions between the naphthalene moieties.