Zinc(II), cadmium(II) and mercury(II) complexes with 2,5‐diphenyloxazole

Abstract

405methylpropylcetone a aussi ete observk vis-a-vis de l'ion borohydrure, et serait diie une conformation pseudocyclique de la molecule stabilisant I'etat initialz2. Pour la diethylcetone (23) on constate qu'il y a additivite des effets observes sur la methylethylcetone (18) par rapport ii l'acetone (17). (Received June 28th. 1978) Abstract. A number of compounds of general formula M(PPO),X, are described, the metal ion being Zn(ll), Cd(I1) and Hg(I1) and the anions C1-, Br-, I -, NO,-, C10,-and NCS-; PPO stands for 2,5-diphenyloxazole and n = 1, 2, 4. The complexes are prepared by reaction of the corresponding metal salts with the molten ligand in the required stoicheiometrical ratio and are characterized by chemical analyses and physical measurements. Their stereochemistry has been assigned on the basis of IR, far IR spectroscopy and molar conductivity values. The ligand PPO is shown to co-ordinate with metal ions via the lone-pair electrons of the nitrogen atom. All the complexes have generally a distorted tetrahedral stereochemistry. MkthylWe previously investigated the properties of Cu( II), Ni( I I) and Co(l I) complexes with 2,s-diphenyloxa~ole~. This ligand acts both as a monodentate N-bonded and as a bridging Nand O-bonded ligand.

Mercury Ions Complexation with a Series of Heterocyclic Derivatives of 3-Hydroxychromone: Spectral Effects and Prospects for Ultrasensitive Hg2+Probing

“…The second metal ion coordinates to the nitrogen atom of side oxazole fragment, forming the Iad complex (Figure ). The principle ability of 2,5-diphenyloxazole to form complexes with several transition metals, and particularly with mercury(II) ions, was reported in . Binding of the second Hg 2+ cation to the oxazolic nitrogen atom should decrease its electron donor ability in respect to the cation-bound chelate formed by two oxygen atoms in positions 3 and 4.…”