Diaqua­bis­[4-(1H-imidazol-2-yl)pyridine-κN]bis­(nitrato-κO)cadmium

In the title compound, [Cd(NO₃)₂(C₈H₇N₃)₂(H₂O)₂], the Cd^II cation is situated on an inversion center and is coordinated by the O atoms of two nitrate anions, by the N atoms of two 4-(imidazol-2-yl)pyridine ligands and by two water O atoms in a slightly distorted N₂O₄ octa­hedral geometry. The dihedral angle between the imidazole and pyridine rings is 1.6 (2)°. In the crystal, mol­ecules are linked by N—H...O, O—H...N and O—H...O hydrogen bonds, forming a three-dimensional network.

N-Cyclo­hexyl-3-methyl­benzamidine

The title amidine compound, C₁₄H₂₀N₂, prepared by a one-pot reaction, is asymmetric as only one N atom has an alkyl substituent. The terminal cyclo­hexyl group connected to the amino N atom is located on the other side of the N—C—N skeleton to the 4-methylbenzene ring and has a chair conformation. The dihedral angle between the phenyl ring and the NCN plane is 47.87 (12)°. In the crystal, mol­ecules are linked via N—H...N hydrogen bonds, forming chains propagating along the a-axis direction.

Tetra­chlorido­[N²,N^2′-(di­methyl­silanedi­yl)bis­(N-tert-butyl-3-methyl­benzimid­amid­ato)-κ²N²,N^2′]hafnium(IV)

The symmetric title mol­ecule, [Hf(C₂₆H₄₀N₄Si)Cl₄], lies about a twofold rotation axis. The Hf^IV and Si atoms lie on the rotation axis with all other atoms being in general positions. The Hf^IV atom is six-coordinated by two N atoms from the N²,N^2′-(di­methyl­silanedi­yl)bis­(N-tert-butyl-3-methyl­benz­imid­amidate) ligand and four Cl⁻ ions in a slightly distorted octa­hedral geometry. The two amidinate moieties are connected through the central Si atom with Si—N bond length of 1.762 (3) Å, generating the characteristic N—C—N—Si—N—C—N skeleton of a silyl-linked ansa-bis­(amidine) species.