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)°.

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 π–π 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, [PdCl2(C26H24P2)]·C2H6OS, the PdII atom adopts a distorted cis-PdCl2P2 square-planar coordination geometry. The five-membered chelate ring adopts an envelope conformation with a methyl­ene C atom in the flap position. The S and C atoms of the dimethyl sulfoxide (DMSO) solvent mol­ecule are disordered over two sets of sites in a 0.8976 (18):0.1024 (18) ratio. The DMSO O atom accepts three C—H⋯O hydrogen bonds from an adjacent complex mol­ecule.

In the mol­ecule of the title compound, C16H20N4, the 1,3-diazinane ring adopts a chair conformation and the dihedral angle formed by the pyridine rings is 78.64 (8)°. The mol­ecular conformation is stabilized by an intra­molecular C—H⋯N hydrogen bond, forming an S(6) ring motif. In the crystal, centrosymmetrically related mol­ecules are linked into dimers by pairs of N—H⋯N hydrogen bonds, generating rings of R 2 2(10) graph-set motif.

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⋯π and C—H⋯π 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).

Novel hybrid xerogel materials were synthesized by a sol-gel procedure. n-octadecyltriethoxysilane was co-condensed with and without different cross-linkers using Q0 and T0 mono-functionalized organosilanes in the presence of n-hexadecylamine with different hydroxyl silica functional groups at the surface. These polymer networks have shown new properties, for example, a high degree of cross-linking and hydrolysis. Two different synthesis steps were carried out: simple self-assembly followed by sol-gel transition and precipitation of homogenous sols. Due to the lack of solubility of these materials, the compositions of the new materials were determined by infrared spectroscopy, 13C and 29Si CP/MAS NMR spectroscopy and scanning electron microscopy.

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 R 2 2(14) loops. Aromatic π–π stacking [shortest centroid–centroid separation = 3.633 (2) Å] inter­actions occur within, and also link, the dimers into chains propagating parallel to [100].

In the title compound, [CdI2(C14H12N2)], the mol­ecule sits on a crystallographic twofold axis. The coordination sphere of the CdII atom is built of two symmetry-equivalent N atoms of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand and two symmetry-equivalent I atoms, thus forming a distorted tetra­hedral geometry. Inversion-related mol­ecules inter­act along the c-axis direction by π–π stacking inter­actions between the phenanthroline ring systems, with centroid–centroid distances of 3.707 (9) and 3.597 (10) Å.

In the title compound, [RuCl2(C5H14N2)(C18H15P)2], the RuII atom is six-coordinated, forming a slightly distorted octa­hedral geometry, with two chloride ions in an axial arrangement, and two P atoms of two triphenyl­phosphane and two chelating N atoms of the bidentate 2,2-dimethyl­propane-1,3-diamine ligand located in the equatorial plane. The average Ru—P, Ru—N and Ru—Cl bond lengths are 2.325 (18), 2.1845 (7) and 2.4123 (12) Å, respectively.

In the title Schiff base, C18H14N4O, the amido –NH– unit is connected to one of the two pyridyl N atoms at an N(—H)⋯N distance of 2.624 (2) Å. The mol­ecular packing features an inter­molecular C—H⋯N R 2 2(6) hydrogen-bonding ring motif.