Dong Shao and coworkers reported a new cobalt(II) complex Co(Brphtpy)22 (Brphtpy = 4'-(4-Bromophenyl)-2,2':6',2''-terpyridine, 1), which exhibited a thermally-induced spin crossover (SCO) and field-induced single-ion magnet (SIM) behaviors. 1 exhibits an incomplete SCO behavior from around 200 K to 400 K, which is supported by peak observations in DSC measurements. AC susceptibility measurements at low temperatures also confirmed that 1 exhibits field-induced SIM behavior. Typically, SCO compounds exhibit a low-spin state at low temperatures, making the coexistence with SIM behaviors rare.
In my view, the evaluation of the structural characterization and magnetic properties of 1 is of sufficient quality to be published in CrystEngComm. However, I have concerns for the reverse SCO behavior. Typically, reverse spin transition is caused by a structural phase transition, which is also mentioned by the authors in the main text. The authors suggest that it could be an rSCO induced by the rotational motion of the bromophenyl group, but is there critical evidence and justification to prove this behavior? They also mention that the SIM behavior is due to the remaining 5% of the high-spin species (S = 3/2), but can it be distinguished from the slow magnetic relaxation behavior caused by the main low-spin species (S = 1/2)? The fact that the spin change is extremely small is also a concern when considering whether it is appropriate to defined as rSCO. Although possible measurements to evaluate these issues could include the assessment of the ratio of high-spin species at low temperatures and the evaluation of the rotational mobility of the bromophenyl group through solid-state NMR measurements, it may be difficult to obtain critical evidence.
That similar magnetic behavior may also occur due to improper diamagnetic correction is also one of my concerns.

There are listed the other minor comments that should be addressed.

1) (Page. 5) The authors mentioned in introduction “This structural characteristic provides a proof for the failure of high-temperature SC-XRD experiment.”
But, the authors have carried out the crystal structural analysis for 1 at high temperature (290 K).
2) (Page. S12) For PXRD pattern of 1, please add the measurement temperature to the caption.

The authors submitted a revised manuscript, and the concerns were appropriately addressed. I recommend this current version of manuscript for publication.