The new synthetic metals of M(dmise) 2 : [Me 3 HN][Ni(dmise) 2 ] 2 and (EDT–TTF)[Ni(dmise) 2 ]

Both of the newly synthesized [Me3HN][Ni(dmise)2]2 and (EDT–TTF)[Ni(dmise)2] exhibit metallic behaviour around room temperature at ambient pressure; tight-binding band calculation indicates that the former has a nearly three-dimensional Fermi surface owing to a strong intersheet interaction between their selone groups.