Dimeric Ni(II)2 and polymeric Ni(II)4Fe(II) type complexes bridged with Cl− and CN− ligands: X-ray structures and magnetic properties of a dimeric complex of [(tren)Ni(μ-Cl)2Ni(tren)](ClO4)2 and a polymeric complex of {[Fe(CN)6][Ni(tren)]2[Ni(tren)(H

Dimeric complex 1 shows a weak ferromagnetic coupling and one-dimensional polymeric rectangular chain of complex 2 shows a spin crossover in Fe(II) ion.