Americium compounds

[3] The oxalate of americium(III), vacuum dried at room temperature, has the chemical formula Am2(C2O4)3·7H2O.

[7] Reduction of Am(III) compounds with sodium amalgam yields Am(II) salts – the black halides AmCl2, AmBr2, and AmI2.

They are very sensitive to oxygen and oxidize in water, releasing hydrogen and converting back to the Am(III) state.

[13] Most americium(III) halides form hexagonal crystals with slight variation of the color and exact structure between the halogens.

AmSix has a bright silvery lustre and a tetragonal crystal lattice (space group I41/amd), it is isomorphic with PuSi2 and ThSi2.

The tetraboride can be obtained by heating an oxide or halide of americium with magnesium diboride in vacuum or inert atmosphere.

[23][24] Analogous to uranocene, americium forms the organometallic compound amerocene with two cyclooctatetraene ligands, with the chemical formula (η8-C8H8)2Am,[25] but it is still hypothetical up to date.

[27][28] Formation of the complexes of the type Am(n−C3H7−BTP)3, where BTP stands for 2,6-di(1,2,4-triazin-3-yl)pyridine, in solutions containing n−C3H7−BTP− and Am+3 ions has been confirmed by EXAFS.