Dioxime and pyridine-2-aldoxime complexes of

Carbon nitride as a ligand: edge-site coordination of ReCl(CO)3-fragments to g-C3N4

IR spectroscopy and model structural studies show binding of ReCl(CO)₃-fragments to carbon nitride (g-C₃N₄) occurs viaκ² N,N' bidentate coordination.

The synthesis and pH-dependent behaviour of Re(CO)3 conjugates with diimine phenolic ligands

In this report we present a study of a series of Re(CO)3 pyridine-imine complexes with pendant phenol groups. We investigated the effects of the position of the phenol hydroxyl group (para, meta or ortho to the imine) on the steric and electronic characteristics of a series of Re(CO)3X(pyca-C6H4OH) compounds, where X = Cl, Br and pyca = pyridine-2-carbaldehyde imine. These compounds can be generated either via ligand synthesis followed by metal chelation (compound 4) or via a one-pot method (compounds 2, 3, 5 and 6). All six compounds show striking differences in pH-dependent UV-visible absorption based on the position of the phenol hydroxyl group.

The synthesis of biologically relevant conjugates of Re(CO)3 using pyridine-2-carboxyaldehyde

The new pyridine-2-carboxaldehyde adduct, Re(CO)₃(NC₆H₅C(O)H)Cl 1, and previously reported complex Re(CO)₃(NC₆H₅C(O)H)Br 2 react with aniline derivatives sulfanilamide or 4-aminofluorescein in methanol giving Schiff base conjugates Re(CO)₃(pyca-R)X (pyca = pyridinecarbaldehyde imine, X = Cl, Br), 3-6. Pre-isolation of compounds 1 and 2 provides a convenient method for preparing conjugate complexes in addition to the known methods of ligand synthesis and one-pot reactions. All new compounds were completely characterized, and compound 1 and the sulfanilamide derivatives 3 and 4 were structurally elucidated by X-ray crystallography.

Synthesis of C2 -Symmetric Dimeric Re(I) Peptide Complexes

The reactions of [Re(CO)₃(H₂O)₃]Br or Re(CO)₅Cl with two peptides, glycylglycine or glycylalanine, were investigated. Each reaction produced a unique, well-defined product. Structural elucidation showed the formation of chiral compounds with the formula [Re(CO)₃(Gly-Xxx-O)]₂, Xxx = Gly 1, Ala 2. Each dimer displays C₂ -symmetry and a nearly rectangular shape. The ligands are bound via the amine and amide carbonyl at a rhenium center and via the pendant carboxylate to the adjacent rhenium center. Both products are fully characterized, via X-ray structure elucidation.

Bis(acetato-κO)bis-(2-pyridine-aldoxime-κ(2)N,N')cadmium

In the title mol­ecule, [Cd(CH₃COO)₂(C₆H₆N₂O)₂], the Cd^II cation is N,N′-chelated by two 2-pyridine­aldoxime ligands and coordinated by two acetate anions in a distorted octa­hedral geometry. The hy­droxy groups of the 2-pyridine­aldoxime ligands link to the acetate anions via intra­molecular O—H⋯O hydrogen bonds. Weak inter­molecular C—H⋯O hydrogen bonds occur in the crystal.