The work by Carter and coworkers describes a new ligand 6-oxo-1,6- dihydro-2,5-pyridinedicarboxylic acid (2,5-H3PODC) as a new ligand and six new coordination polymers of two types, the type 1: [Ln(HPODC)(Ox)0.5(H2O)2] (where (Ox) = oxalic acid and Ln = Pr3+ (1), Nd3+ (2)) and type 2: [Ln(H2PODC)(HPODC)(H2O)] (Ln = Eu3+ (3), Gd3+ (4), Dy3+ (5), Er3+ (6). Synthesis crystal structures, termogravimetric properties and photoluminescent properties for the Eu3+ complex are described. The characterization of the ligand is well conducted. However, in my opinion, the quality of the data is insufficient to be published in Dalton Transactions in its current form. Perhaps, CrystEngComm is more suitable for these data after a deep proofreading. Indeed, I noticed some issues in the manuscript, which I´ve listed below:

1) In the experimental part, it lacks the mass of products 1-6, as well as the yield of all reactions.
2) In the experimental part, it lacks the inclusion of FTIR vibrations for all complexes, as well as a discussion of them.
3) Do the authors determine the elemental analysis for the complexes? I think they should include this data.
4) Page 17, the authors state: “The first weight losses of 5.48 wt% occur from 234 °C to 310 °C for compound 2 (Calcd 8.01%) and 1.60% from 210 °C to 325 °C for compound 4 (Calcd 3.34%), which correspond to the loss of coordinated water molecules.” And in the conclusion, pages 19-20, the authors reveal: “Thermogravimetric analysis (TGA) revealed that compound 2 remains stable to 310 °C and compound 4 to 325 °C, with both materials undergoing decomposition in four distinct steps.”
Please review these statements, as some inconsistencies seem to have appeared here. The TG curves show that decomposition starts before 300 °C. The complexes are not thermally stable until 310-325 °C, as shown in TG curves.
5) Were the photoluminescent studies performed at room temperature?
6) Did the authors determine the energy of the triplet state for this ligand? If not, please provide a reason once the Gd3+ is isostructural with the Eu3+ complex.
7) Also, it lacks a discussion comparing the photoluminescent results with other compounds from the literature.

Please see the attached file.

The authors have addressed all the issues, purifying the samples and providing new data to support their claims. In light of these improvements, I believe the manuscript is now suitable for publication in Dalton Transactions.