Exchange interactions are estimated as no more than 10s of wavenumbers, but magnetization data could not be reproduced with simple exchange models. This is consistent with a recent INS study on an Er-radical mononuclear complex that found a complex exchange interaction involving a high level of mixing between Ln 4f and radical-π electrons. The relatively large CFs in 2-Yb and 2-Tm result from the well-defined equatorial coordination environment of 2-Ln stabilizing prolate electron density. As has been a common trend in literature, magnetic data reveals another Yb 3+ equatorial coordination complex that does not demonstrate magnetic memory effects. The lack of SMM behavior is consistent with computational calculations and EPR experimental data, which both indicate significant transverse g-values and rapid QTM rates within the ground Kramers doublet. Recent work allows an approximation of τQTM based on the ground state g-values and here yields τQTM ≈ 1 × 10 -7 s (based on CASPT2 g-tensor with 20 mT average field, τQTM ≈ 2 × 10 -6 s from CASSCF g-tensor), far faster than observable with ac susceptibility on PPMS or MPMS systems. This highlights the importance of minimizing transverse g-values regardless of the magnitude of the overall CF splitting.