An-Najah Staff

In the title complex, [CdBr2(C14H12N2)], the CdII ion is tetracoordinated by two N atoms of the bidentate 2,9-dimethyl-1,10-phenanthroline ligand and two bromide ions in a substantially distorted CdN2Br2 tetrahedral geometry. In the crystal, inversion dimers linked by pairs of weak C-H Br bonds generate R22(14) loops. Aromatic - stacking [shortest centroid-centroid separation = 3.633 (2) Å] interactions occur within, and also link, the dimers into chains propagating parallel to [100].

The asymmetric unit of the title compound, [Hg(SCN)2(C14H12N2)], contains two complex molecules in which the HgII atoms are both four-coordinated in a distorted tetrahedral configuration by two N atoms from a chelating 2,9-dimethyl-1,10-phenanthroline ligand and by two S atoms from two thiocyanate anions. The 1,10-phenanthroline ligand is slightly folded for one complex, the dihedral angle between the pyridine planes being 5.3 (1)°. In contrast it is nearly planar [0.5 (1)°] as it complexes with the other HgII atom. The thiocyanate ligands are virtually linear and the S atom is bonded to HgII with N S-Hg angles ranging from 99.3 (1) to 103.5 (1)°. Despite the presence of six aromatic rings in the asymmetric unit, there are no significant intermolecular - contacts between phenanthroline ligands as the centroid-centroid distance of the closest contact between six-membered rings is 4.11 (1) A°.

In the title compound, [RuCl2(C6H14N2)(C28H28P2)].CH2Cl2, the RuII ion is coordinated in a slightly distorted octahedral environment, formed by two cis-oriented chloride ligands, two cis P atoms of a 1,4-bis(diphenylphosphanyl)butane ligand and two cis-chelating N atoms of a bidentate cyclohexane-1,2-diamine ligand. In the crystal, pairs of molecules form inversion dimers via N-H Cl hydrogen bonds. In addition, intramolecular N-H Cl and weak C-H Cl, C-H N, N-H and C-H hydrogen bonds are observed. One of the Cl atoms of the solvent molecule is disordered over two sites with refined occupancies of 0.62 (1) and 0.38 (1).

The title compound, [HgCl2(C14H12N2)], consists of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand chelating the HgII ion and two chloride ligands coordinating to the HgII ion, forming a distorted tetrahedral environment. The dmphen ligand is nearly planar (r.m.s. deviation = 0.0225 Å). The dihedral angle between the normal to the plane defined by the HgII atom and the two Cl atoms and the normal to the plane of the dmphen ring is 81.8 (1)°.

In the title complex, [CdBr2(C14H12N2)], the CdII ion is tetra¬coordinated by two N atoms of the bidentate 2,9-dimethyl-1,10-phenanthroline ligand and two bromide ions in a substanti¬ally distorted CdN2Br2 tetra¬hedral geometry. In the crystal, inversion dimers linked by pairs of weak C—H Br bonds generate R 2 2(14) loops. Aromatic π–π stacking [shortest centroid–centroid separation = 3.633 (2) Å] inter¬actions occur within, and also link, the dimers into chains propagating parallel to [100].