Complexation of Eu(III) with alkyl-substituted malonamides in acetonitrile
Abstract
The complexation of Eu(III) with a series of ′,N
′-tetramethylmalonamide (TMMA) > N,N
′-dibutyl-N,N
′-dimethylmalonamide (DMDBMA) > N,N,N
′,N
′-tetrahexylmalonamide (THMA) > N,N,N
′,N
′-tetraisopropylmalonamide (TiPMA). For substitution on the central carbon atom, the formation constants decrease in the order: N,N,N
′,N
′-tetrahexyl-2-methylmalonamide (MeTHMA) > N,N,N
′,N
′-tetrahexylmalonamide (THMA) > N,N,N
′,N
′-tetrahexyl-2,2-dimethylmalonamide (DMeTHMA). These orders are discussed in terms of the steric effect and the