ORGANOMETALLIC CHELATING LIGANDS - SYNTHESIS OF A NEW ANIONIC TRIPOD LIKE LIGAND WITH AN N,N',O-DONOR SET - X-RAY CRYSTAL-STRUCTURE OF [(ETA(6)-C6ME6)RU(MU-P(O)(OME)2)(MU-PZ)2RE(CO)3] (ME=METHYL, PZ=PYRAZOLATE)
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1994
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Abstract
The synthesis of the new anionic organometallic chelating ligand [(eta6-C6Me6)Ru{P(O)(OMe)2}(Pz)2]- = L-(Me = methyl, Pz = pyrazolate) is described. This ligand was isolated as its neutral sodium derivative NaL. approximately 0.7NaPF6, which is a new synthetic precursor for obtaining heterobimetallic complexes with phosphonate and pyrazolate groups acting as bridging ligands. The heterobimetallic compound LRe(CO)3 was obtained by reaction of ReBr(CO)5 with NaL. approximately 0.7NaPF6, in which the anionic complex L- is acting as an N,N',O-tripod donor ligand. The structure of the title complex was established by X-ray crystallography. The compound crystallizes as monoclinic, space group Cc (No. 9) with a=31.214(6), b=11.111(2), c=15.769(3) angstrom, beta=103.14(3)-degrees. The neutral complex has a binuclear structure with the (C6Me6)Ru and Re(CO)3 Moieties triply bridged by two pyrazolate groups and one phosphonate group. The synthesis of TlPz is also described.
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CRYSTAL STRUCTURES, RUTHENIUM COMPLEXES, POLYDENTATE LIGAND COMPLEXES, TRIPOD LIGAND COMPLEXES, ARENE COMPLEXES, CARBONYL COMPLEXES