Mononuclear bis-chelate and tris-chelate complexes of nickel(II) with selenocyanate. Molecular structure of [Ni(en)3]cis-[Ni(en)2(NCSe)2]2X2 (X PF6−, ClO4− and SeCN−) and trans-[Ni(en)2(NCSe)2] | Publicación