Four new Re(I) tricarbonyl-diimine complexes were prepared by reaction of Re(CO) 5 Cl with N,N 0 -bis(substituted benzylidene)ethane-1,2-diamine Schiff base ligands. These compounds were characterized by physicochemical methods, and their crystal structures were established by X-ray diffraction. The coordination geometry at the Re atom is that of a distorted octahedron, with three carbonyl ligands in the facial geometry.

The photocatalytic degradation of ortho, para and meta-nitroanilines (ONA, PNA and MNA) was investigated by Ag-TiO 2 suspension. The effect of some parameters such as the amount of photocatalyst, irradiation time of UV light, flow rate of O 2 , pH, and temperature for the Ag-TiO 2 photocatalyst was also examined. Degradation of amines was small when the reaction was carried out in the absence of photocatalyst, and negligible in the absence of the UV light. Degradation rate of aniline derivatives decreases with increasing O 2 in the system. The effect of pH indicated that effective degradation occurred in alkaline conditions. Degradation kinetics of these aromatic amines can be described by Langmuir-Hinshelwood equation and shows pseudo-first order law.

The mol­ecule of the title Schiff base compound, C16H14Br2N2, lies across a crystallographic inversion centre. The C=N bond adopts a trans configuration. The imino group is coplanar with the benzene ring. Within the mol­ecule, the planar units are parallel, but extend in opposite directions from the dimethyl­ene bridge. The inter­esting feature of the structure is the weak Br⋯Br inter­action [3.7501 (2) Å] linking the mol­ecules into chains along the c axis. These chains are stacked along the b axis.

No abstract

fac-[Re(CO) 3 (2-nben)Cl] and fac-[Re(CO) 3 (4-nbzen)Cl] complexes consisting of 2-nbzen = N,N 0 -bis(2-nitrobenzaldehyde)-1,2-diiminoethane and 4-nbzen = N,N 0 -bis(4-nitrobenzaldehyde)-1,2-diiminoethane were synthesized by the reaction of Re(CO) 5 Cl with nbzen ligands. These complexes were characterized by physico-chemical, spectroscopic methods and X-ray crystallography. The electrochemical behavior of the two complexes was investigated by cyclic voltammetry. In the crystal structure of [Re(CO) 3 (4-nbzen)Cl], the neighbouring molecules are linked together by intermolecular C-HÁÁÁCl interactions to form 1D extended chains along the b-axis.