(E)-2-(5,5-Dimethyl­hexa­hydro­pyrimidin-2-yl)-4-(phenyl­diazen­yl)phenol

In the title Schiff base, C18H22N4O, the hexa­hydro­pyrimidinyl ring adopts a chair conformation. The dihedral angle between the aromatic rings of the 4-(2-phenyl­diazen­yl)phenol unit is 15.7 (1)°. There is an intra­molecular O—H⋯N hydrogen bond between the hydroxyl group and an N atom of the hexa­hydro­pyimidinyl unit. Inter­molecular N—H⋯O and N—H⋯N hydrogen bonds give rise to a layer structure

{1,1′-[(2,2-Dimethyl­propane-1,3-di­yl)bis­(nitrilo­methyl­idyne)]di-2-naphthol­ato}dioxidomolybdenum(VI) dichloro­methane 1.75-solvate

In the crystal structure of the title compound, [Mo(C27H24N2O2)O2]·1.75CH2Cl2, the MoVI ion is coordinated by two oxide O atoms and by two O and two N atoms of the tetra­dentate 1,1′-[(2,2-dimethyl­propane-1,3-di­yl)bis­(nitrilo­methyl­idyne)]di-2-naphtholate Schiff base ligand in a distorted octa­hedral configuration. The compound crystallizes with 1.75 mol­ecules of dichloro­methane per complex mol­ecule. In the crystal, symmetry-related mol­ecules are linked by a number of C—H⋯O inter­actions involving both the Schiff base ligand and the partly disordered dichloro­methane solvent mol­ecules, leading to the formation of a two-dimensional network extending parallel to (101)

Methano­ldioxido{1-[(2RS)-(2-oxidoprop­yl)iminometh­yl]-2-naphtholato}molybdenium(VI)

Crystals of the title compound, [Mo(C14H13NO2)O2(CH4O)], were obtained by recrystallization from methanol. The MoVI atom is coordinated by two oxide O atoms and by two O atoms and one N atom of the tridentate 1-[(2-oxidoprop­yl)iminometh­yl]-2-naphtholate Schiff base ligand. The coordination sphere is completed by the O atom of a methanol mol­ecule, yielding a distorted octa­hedron. O—H⋯O hydrogen bonding yields centrosymmetric dimers

{2,2′-[(2,2-Dimethylpropane-1,3-diyl)bis(nitrilomethylidyne)]diphenolato}dioxidomolybdenum(VI)

In the structure of the title compound, [Mo(C19H20N2O2)O2], the Mo atom exhibits oxidation state +VI and is surrounded by two O atoms and the tetradentate Schiff base ligand 2,2′-[(2,2-dimethylpropane-1,3-diyl)bis(nitrilomethylidyne)]diphenolate in a distorted octahedral configuration. An intramolecular C—H...O hydrogen bond between a methylene group and one O atom of the O=MoVI=O unit, as well as additional intermolecular hydrogen bonds between neighboring molecules, lead to a weakly bonded inversion-symmetric dimeric structure