cis-Dichloridobis(1,10-phenanthroline-5,6-diol-κ²N,N′)manganese(II): a supramolecular chain formedviaO—H...Cl bonds and aromatic stacking

Abstract

The title compound, [MnCl(2)(C(12)H(8)N(2)O(2))(2)], displays a novel supramolecular chain formed by intermolecular O-H...Cl hydrogen bonds and aromatic stacking. The molecule has crystallographically imposed twofold symmetry with the Mn(II) atom on the twofold axis. In the 1,10-phenanthroline-5,6-diol ligand, each H atom of the two hydroxy groups is oriented towards the other hydroxy O atom. Both hydroxy groups form intermolecular O-H...Cl hydrogen bonds with a single Cl atom of an adjacent molecule. These hydrogen bonds connect the molecules via operation of the molecular twofold axis and the centre of inversion of the crystal lattice, forming a doubly-bridged one-dimensional structure with Mn atoms as the nodes. Strong aromatic pi-stacking between two antiparallel neighbouring 1,10-phenanthroline-5,6-diol ligands also helps to stabilize the chain.

A Molecular Helix: Self-Assembly of Coordination Polymers from d10 Metal Ions and 1,10-Phenanthroline-5,6-dione (pdon) with the Bridges of SCN− and Cl− Anions

“…Zn−Cl bond distances [2.565(4) and 2.713(5) Å] are longer than that in the previous reports . The bond angle of N1−Zn1−N2 [70.9(4)] is comparable to the reported complexes . The Cl1−Zn1−Cl1 angle is 93.59(7)° (see Table ).…”

“…The metal centers are six-coordinated in a slightly distorted octahedron by two pdon ligands and cis -Cl − ( 3 ) or cis -SCN − ( 4 ) anions, forming a coordination environment of MnN 6 or HgN 4 Cl 2 in which the four N atoms come from pdon ligands and the other two N from a SCN anion in 3 or two Cl atoms from Cl anions in 4 . The Mn−N(pdon) distances are in the range of 2.249(5)−2.310(5) Å, which is comparable to the corresponding bond distances in cis- [Mn(bipy) 2 (NCS) 2 ] (bipy = 2,2′-bipyridine) [2.286(8)−2.312(8) Å] and cis -[Mn(bipy) 2 (C1) 2 ] [2.270(3)−2.342(3) Å] . The Mn−N(SCN) [2.117(6) and 2.117(8) Å] distances are shorter than that in the reported literature [Mn−N(SCN) 2.139(3) Å] .…”

cis,trans-Dicarbonyldichlorido(1,10-phenanthroline-5,6-dione-κ2N,N′)ruthenium(II)

“…The C O bond length of metal-free phendione is 1.210 Å (averaged) (Calderazzo et al, 1999), while C O bond lengths of metal complexes containing phendione as a ligand are in the range 1.154-1.264 Å (Fujihara et al, 2003(Fujihara et al, , 2004Larsson & Ö hrströ m, 2004;Yokoyama et al, 2006) and the C-O bond lengths of the corresponding diol ligand are 1.364-1.367 Å (Guan et al, 2008;Larsson & Ö hrströ m, 2004). The C O bond length of the phendione ligand in the complex [1.239 (5) Å ] is nearly the same as that of metal-free phendione (Calderazzo et al, 1999) or those of other Ru II -phendione complexes (Fujihara et al, 2003(Fujihara et al, , 2004Yokoyama et al, 2006), indicating that the phendione ligand in the complex retains its double-bond character.…”