Single crystal and solution complex structure of Nd(CO3)(4)(5-). The firstcharacterization of a mononuclear lanthanide(III) carbonate complex

Carbonate is generally a strongly complexing ligand for f-element ions, inc luding trivalent lanthanides. The few lanthanide(III) carbonates previously characterized have extended multidimensional solid stare structures. Spect roscopic and solubility studies indicate that the solution species are mono meric; however, structural details remain unknown. We report the first sing le-crystal structure of a discrete mononuclear Nd(III) carbonate, the guani dinium salt of Nd(CO3)(4)(H2O)(5-), which corresponds directly to a species formed in highly concentrated carbonate solutions.