Abstract
Abstract The syntheses of nineteen transition metal salt complexes of (-)-sparteine and the copper bromide complex of (-)-β-iso-sparteine are reported. All form 1:1 salt:sparteine complexes, which are soluble in organic solvents and decompose in water. Far infrared spectroscopy and the metal isotope technique were used to detect and assign metal-halide and metal-nitrogen absorption frequencies. The metal halide absorptions occur in the region from 353 to 140 cm−1, and the metal-nitrogen absorptions from 468 to 181 cm−1. Observed trends are discussed on the basis of changes in metal size, ionic charge, and halogens. Comparisons are drawn between these values and those for similar compounds where available.
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