The groups of Deng and Nakajima have reported the synthesis and characterization of dicobalt complexes similar to 3 and 4. with the Co-Co distance fixed at the values for the other compound. When the Co-Co distance in D10 is decreased to 2.46 Å, the Mayer bond order increases to 0.14, still significantly lower than that of N4. When the Co-Co distance in N4 is increased to 2.62 Å, the bond order decreases to 0.40, a substantial drop but still much higher than that of D10. Thus, while Co-Co distance strongly impacts bond strength, it does not in itself imply a bonding interaction.