Antiferromagnetic Interactions through the Thirteen Å Metal–Metal Distances in Heterometallic One‐dimensional Chains

A heterometallic and paramagnetic one‐dimensional aligned chain in −Rh(+2)−Rh(+2)− Pt(+2)−Ni(+2)−Pt(+2)− with direct metal−metal bonds was obtained via HOMO–LUMO interactions at the σ* (d z 2 ) orbital between [Rh 2 (O 2 CCH 3 ) 4 ] and [Pt 2 Ni(piam) 4 (NH 3 ) 4 ] (piam=pivalamidate). The one‐dimensional chains had straight backbones attributed to face‐to‐face stacking of each complex, and the Ni atoms were separated by approximately 13 Å from four different metals. Each Ni atom had two unpaired electrons in the d‐orbitals, which strongly exchanged with J =−37.9 cm −1 through the diamagnetic −Pt−Rh−Rh−Pt− bonds.