Crystal structures of [Mn2(H2O)4(phen)2(C4H4O4)2] • 2 H2O and [Mn(phen)2(H2O)2][Mn(phen)2(C4H4O4)](C4H4O4) •7 H2O

Reactions of 1,10-phenanthroline monohydrate, Na2C4H4O4. 6H(2)O and MnSO4 .H2O in CH3OH/H2O yielded a mixture of [Mn-2(H2O)(4)(phen)(2)(C4H4O4)(2)]. 2H(2)O (1) and [Mn(phen)(2)(H2O)(2)][Mn(phen)(2)(C4H4O)](C4H4O4). 7H(2)O (2). The crystal structure of 1(P (1) over bar (no.2), a = 8.257(1) Angstrom, b=8.395(1) Angstrom. c=12.879(2) Angstrom, alpha = 95.33(1)degrees beta= 104.56(1)degrees, gamma = 106.76(1)degrees, V= 814.1(2) Angstrom (3). Z = 1) consists of the dinuclear [Mn-2(H2O)(4)(phen)(2)(C4H4O4)(2)] molecules and hydrogen bonded H2O molecules. The centrosymmetric dinuclear molecules, in which the Mn atoms are octahedrally coordinated by two N atoms of one phen ligand and four O atoms from two H2O molecules and two bis-monodentate succinato ligands, are assembled via pi-pi stacking interactions into 2D supramolecular layers parallel to (10(1) over bar) (d(Mn-O)= 2.123-2.265 Angstrom, (d) over bar (Mn-N)= 2.307 Angstrom). The crystal structure of 2 (P (1) over bar (no. 2), a=14.289(2) Angstrom, b=15.182(2) Angstrom, c = 15.913(2) Angstrom, alpha= 67.108(7)4 beta= 87.27(1)degrees, gamma = 68.216(8)degrees. V = 2934.2(7) Angstrom (3). Z = 2) is composed of the [Mn(phen)(2)(H2O)(2+) cations. [Mn(phen)(2)(C4H4O4)] complex molecules, (C4H4O4)(2-) anions, and H2O molecules. The (C4H4O4)(2-) an ions and H2O molecules form 3D hydrogen bonded network and the cations and complex molecules in the tunnels along [001] and [011], respectively, are assembled via the pi-pi stacking interactions into 1D supramolecular chains. The Mn atoms are octahedrally coordinated by four N atoms of two bidentate chelating phen ligands and two water O atoms or two carboxyl O atoms (d(Mn-O)= 2.088-2.129 Angstrom, d(Mn-N)= 2.277-2.355 Angstrom). Interestingly. the succinato ligands in the complex molecules assume gauche conformation bidentately to chelate the Mn atoms into seven-membered rings.