A new and more basic ligand has been used to make two new tricobalt extended metal atom chains (EMACs), namely, CO3(depa)(4)Cl-2, 3, and Co-3(depa)(4)(CN)(2), 4. The depa ligand is di(4-ethyl-2-pyridyl)amide, a useful modification of the well-known di(2-pyridyl)amide, dpa, ligand. The new compounds have been thoroughly characterized, and informative comparisons are made of 3 with Co-3(dpa)(4)Cl-2, 1, and 4 with Co-3(dpa)(4)(CN)(2), 2, which were described several years ago. Introduction of the eight ethyl groups into the trimetal compounds improves solubility, makes oxidations easier, and allows for a more complete examination of the magnetic susceptibility as a function of temperature for 3 than was possible for 1. The data clearly indicate that the upper state for 3 has S = (3)/(2) and suggest that this is the case for 1 as well.