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The stoichiometry and stability of lanthanide complexes with tetrahydrofuran-2,3,4,5-tetracarboxylic acid (THFTCA) have been investigated by potentiometric titration. X-ray crystallographic analysis of the monohydrate has confirmed identification of the THFTCA as thetrans-cis-trans geometric isomer, having the 2,5 and 3,4 carboxylate groups on opposite sides of the THF ring. THFTCA H 2 ...
The ligand 6,6'-bis(diphenylphosphinomethyl)-2,2'-bipyridine-N,N',P,P'-tetraoxide (7) is prepared by oxidation of the parent phosphine 6,6'-bis(diphenylphosphinomethyl)-2,2'-bipyridine (10). Combination of the oxidized ligand with lanthanide nitrates Ln(NO 3 ) 3 .(H 2 O) n (Ln = La, Pr, Nd, Dy, Er) results in formation of 2:1 metal:ligand complexes, and the molecular...
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