(S,E)-3-[(2-Hydroxybenzylidene)amino]-2-(2-hydroxyphenyl)-2,3-dihydroquinazolin-4(1H)-one

In the title compound, C21H17N3O3, the dihydroquinazoline ring adopts a screw-boat conformation and its stereogenic C atom has an S configuration. The dihedral angle between the mean planes of the two hydroxyphenyl rings is 86.61 (12)°. The amino H atom forms an intramolecular hydrogen bond with a phenol O atom, while the hydrazine N atom acts as an acceptor for the H atom of the other phenol group. In the crystal, O—H...N and O—H...O hydrogen bonds and weak C—H...centroid(π-ring) intermolecular interactions are observed, forming chains along [1-10] and [110]

Dichlorido[2-(pyridin-2-yl)-N-(pyridin-2-ylmethylidene)ethanamine-κ3N,N′,N′′]manganese(II) monohydrate

In the title complex, [MnCl2(C13H13N3)]·H2O, the MnII atom is in a distorted square-pyramidal environment, with an Addison τ parameter of 0.037. The coordination geometry is defined by three N-atom donors from the tridentate 2-(pyridin-2-yl)-N-(pyridin-2-ylmethylidene)ethanamine ligand and two terminal Cl atoms. Although the H atoms of the lattice water molecule were not located, O...O distances of 3.103 (7) Å and O...Cl distances of 3.240 (3) and 3.482 (4) Å suggest that hydrogen bonding is responsible for the stabilization of the crystal packing

Aqua{2-(pyridin-2-yl)-N-[(pyridin-2-yl)methylidene]ethanamine-κ3N,N′,N′′}(sulfato-κ2O,O′)copper(II) tetrahydrate

The title complex, [Cu(SO4)(C13H13N3)(H2O)]·4H2O, was obtained by mixing copper sulfate pentahydrate and 2-(pyridin-2-yl)-N-(pyridin-2-ylmethylidene)ethanamine in ethanol under reflux conditions. The CuII ion shows a Jahn–Teller-distorted octahedral geometry, with equatorial positions occupied by three N atoms from the tridentate ligand (average Cu—N = 2.004 Å) and one O atom from a bidentate sulfate anion [Cu—O = 1.963 (2) Å]. The axial positions are occupied by one O atom from a coordinating water molecule [Cu—O = 2.230 (3) Å] and one weakly bonded O atom [Cu—O = 2.750 (2) Å] from the bidentate sulfate ion. The complex molecules are connected through O—H...O hydrogen bonds between the coordinating water molecules and sulfate ions from neighboring complexes, forming a double chain parallel to the c axis. The chains are stabilized through additional hydrogen bonds by one of the non-coordinating water molecules bridging between neighboring strands of the double chains. The remaining three water molecules fill the interstitial space between the double chains and are involved in an intricate hydrogen-bonding network that consolidates the structure