The coordination chemistry of benzhydrazide with lanthanide(iii) ions: hydrothermal ligand formation, structures, magnetic and photoluminescence sensing properties.

The influence of synthetic conditions on the solid-state structural formation of lanthanide(iii) complexes based on a hydrazide ligand have been investigated and reported. Depending on the solvents and reaction temperatures, the reactions of hydrated Ln(NO) with a benzohydrazide (bzz) ligand afforded three classes of lanthanide(iii) coordination complexes . [Ln(bzz)(NO)](NO) (1Ln; Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5)), [Ln(bzz)(ben)(HO)]·HO (2Ln; Ln = Pr (6), Nd (7), Sm (8), Eu (9), Gd (10), Tb (11), Dy (12), Er (13)), and [Ln(ben)] (3Ln; Ln = Eu (14), Gd (15), Tb (16), Dy (17), Er (18), Tm (19), Yb (20), Lu (21)).

Crystal structure of 3,13-dimethoxy-5,6,10,11-tetrahydrofuro[3,4-i][5]helicene-7,9-dione.

The title compound, C26H20O5, crystallizes with two independent molecules (A and B) in the asymmetric unit, which differ primarily in the location of the -OCH3 groups. In the crystal, the mol-ecules form a layered structure parallel to (10-1) by C-H⋯O hydrogen-bonded networks. Adjacent layers are also linked by further C-H⋯O hydrogen bonds, forming a three-dimensional structure.

3,12-Dimeth-oxy-5,6,9,10-tetra-hydro-[5]helicene-7,8-dicarbo-nitrile.

The complete molecule of the title compound, C26H20N2O2, is generated by a crystallographic twofold axis. The torsion angle between the terminal and central benzene rings is -32.5 (2)°.