Résultat de la recherche
The Adaptable Coordination Chemistry of 6-Chloro-2-(quinolin-2-yl)-2,4-dihydro-1H-benzo[d][1,3]oxazine Towards Zinc(II) and Mercury(II)
The coordination chemistry of 6-chloro-2-(quinolin-2-yl)-2,4-dihydro-1H-benzo[d][1,3]oxazine (LH2) towards zinc and mercury has been explored. The ligand exhibits high versatility and provides different environments to the metal centre as a function of its diverse coordination modes. In one of the isolated and characterized complexes, [Zn(LOH)Cl2], the zinc centre is found pentacoordinated with the ligand present in an iminic “open” structure. The oxidized form, which contains the 4H-benzo[d][1,3]oxazine part (L), is also encountered in [Zn(L)Cl2], whereas the crystal structure of the trinuclear compound [Hg3(LH2)2Cl6] shows the ligand LH2 in its original arrangement.
1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene, a New Chelating Ligand with Versatile Coordination Properties
1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene (dppbH; 1) was prepared by peptidic coupling and shown to exist, in the solid state, in the form of hydrogen-bonded dimers by single-crystal X-ray structure analysis. As expected, 1 reacts with [MCl2 (cod)] (M = Pd, Pt; cod = cyclooctadiene) to form square-planar complexes. However, in the case of palladium [PdCl2 (dppbH)] (2) is obtained, while in the case of platinum [Pt(dppb)] (3) is formed. Thus, the nature of the metal induces a completely different coordination mode: In 2, the dppbH ligand only coordinates through the two phosphorus atoms, while in 3 a dppb ligand, formed by deprotonation of the two amino functions in dppbH, coordinates through the two phosphorus atoms and through the two nitrogen atoms. The single-crystal X-ray analyses of the two square-planar complexes reveal 2 to contain the two phosphorus atoms in a trans coordination mode and 3 to contain the two phosphorus atoms in a cis coordination mode.