4-Phenyl­diazenyl-2-[(R)-(1-phenyl­ethyl)imino­meth­yl]phenol

The title chiral photochromic Schiff base compound, C21H19N3O, was synthesized from (R)-1-phenyl­ethyl­amine and the salicylaldehyde of an azobenzene derivative. The mol­ecule corresponds to the phenol–imine tautomer, the C=N and N—C bond distances being 1.279 (3) and 1.477 (3) Å, respectively. An intra­molecular O—H⋯N hydrogen bond occurs. The diazenyl group adopts a trans form with an N=N distance of 1.243 (3) Å

A chiral photochromic Schiff base: (R)-4-meth­oxy-2-[(1-phenyl­ethyl)imino­meth­yl]phenol

The title chiral photochromic Schiff base compound, C16H17NO2, was synthesized from (R)-1-phenyl­ethyl­amine and 5-methoxy­salicylaldehyde. The mol­ecule of the title compound exists in the phenol–imine tautomeric form. The dihedral angle between the two aromatic rings is 62.61 (11)°. An intra­molecular O—H⋯N hydrogen bond with an O⋯N distance of 2.589 (2) Å is observed. The crystal packing is stabilized by C—H⋯π inter­actions involving the aromatic ring

Diaqua­bis(2,4-dichloro-6-formyl­phenolato)zinc(II)–bis­(μ-2,4-dichloro-6-formyl­phenolato)bis­[aqua­(2,4-dichloro-6-formyl­phenolato)zinc(II)] (2/1)

The crystal of the title compound, [Zn(C7H3Cl2O2)2(H2O)2]2·[Zn2(C7H3Cl2O2)4(H2O)2], consists of monomeric and dimeric ZnII complexes. Both complexes afford a six-coordinated coordination environment about the Zn atoms with cis-configuration ligands. The deprotonated hydr­oxy groups of the 3,5-dichloro­salicylaldehyde ligands bridge two metal cations, forming a centrosymmetric dimeric complex. Inter­molecular O—H⋯O hydrogen bonding occurs between the coordinated water mol­ecules and deprotonated hydr­oxy groups in the crystal structure

Theoretical Interpretation of Polarized Light-Induced Supramolecular Orientation on the Basis of Normal Mode Analysis of Azobenzene as Hybrid Materials in PMMA with Chiral Schiff Base Ni(II), Cu(II), and Zn(II) Complexes

We have prepared hybrid materials of azobenzene and chiral Schiff base Ni(II), Cu(II), and Zn(II) complexes and investigated their linearly or circularly polarized UV (ultraviolet) light-induced supramolecular orientation with polarized electronic and IR spectra or CD (circular dichroism) spectra. The experimental FT-IR (Fourier transfer-infrared) spectra of azobenzene molecules were recorded at room temperature, and the results were compared with quantum chemical theoretical values using B3LYP, M052X, and M062X DFT (density functional theory) methods. The interaction of azobenzene with PMMA was simulated. Molecular geometry, vibrational wavenumbers, and thermodynamic parameters were calculated in all these systems. With the help of specific scaling procedures for the computed wavenumbers, the experimentally observed FT-IR bands were analyzed and assigned to different normal modes of the molecule. Most modes had wavenumbers in the expected range, and the error obtained was in general very low. Several general conclusions were deduced