Dear Editors and Reviewers

Dear Editors and Reviewers:

Thank you for your letter and concerning our manuscript entitled “A two-dimensional cadmium(II) polymer based on nicotinic acid and thiocyanate ligands”. The main corrections in the paper and the responds to the reviewer’s comments are as flowing:

Responds to the reviewer’s comments:

Authors synthesized a novel Cd(II) complex which coordinated with nicotinic acid and thiocyanate ligands. The structure of this compound was determined clearly by single crystal X-ray analysis. Authors also described about 2D- and 3D-network structure formed by hydrogen bonding and Cd- ligand coordination.

There is NO serious problem in manuscript and structure analysis. To accept, however, I have some requests commented below. ===Comments=== 1) Scheme of (I) Please correct a scheme of (I) because the formula in structural unit is different from that determined by structure analysis. There are two nicotinic acid molecules and a water molecule in a structural unit. Response: Thanks for yours comments, we have corrected the scheme of (I).

2) L.7 In abstract, "(" is missing in formula, {[C6H5NO2)2][Cd(SCN)2].H2O}. Response: We have made correction according to the Reviewer’s comments: “A cadmium- thiocyanate complex, {[C6H5NO2)2][Cd(SCN)2]·H2O} was synthesized by the reaction of nicotinic acid, cadmium nitrate tetrahydrate and potassium thiocyanide in aqueous solution” in line 7.

3)L.35 The molar ratio is not stoichiometry. Please mention or refer about it, if it is correct. Response: Considering the Reviewer’s suggestion, we have made correction: “The title compound was obtained from an aqueous solution containing 1:1:3 mol equivalent of nicotinic acid, cadmium nitrate tetrahydrate and potassium thiocyanide”.

4)L.52 Delete standard deviation from 180.00(6). Because Cd atom is on inversion center, linear trans-angle is always 180deg. Response: We have made correction according to the Reviewer’s comments: “linear trans-angles [180.00°]”.

5)L.73-75 Authors described the difference of the number of ring in per grid between (I) and [Cd(dmen) (SCN)2]n. But I think the important is not the number of ring but the coordination motif of ligand. Nicotinic acid is unidentate and dmen is bidentate ligand. A dmen molecule coordinates with a Cd atom on cis position. On the other hand, two nicotinic acid molecules coordinate on trans position. This cause the difference of the motif of 2D-network and may affect the formation of 3D-network. Authors should describe the difference of the form of rings, and other examples of ring motifs if you know. Response: Considering the Reviewer’s suggestion, we have made correction: “This also differs from the two-dimensional polymeric sheet of [Cd(dmen)(SCN)2]n (dmen=N,N- dimethylethylenediamine) (Mondal et. al., 2000), which the 2-D sheet was formed through the bidentate dmen ligand and single SCN− bridges. It should be pointed out that the bidentate dmen molecule coordinates with a Cd atom on cis position, which is different from our reported compound with two unidentate nicotinic acid molecules coordinate on trans position”.

6)L.91 In figure 1, symmetry operation (iii) may not be z+1/2 but z-1/2. Please check Response: Thanks for yours comments, we have corrected these mistakes.

7) L.118 In table 1, Tmin and Tmax are the same. Is it correct? Please check. Response: Considering the Reviewer’s suggestion, we have made correction: “Tmin=0.684, Tmax =0.758” are shown in the CIF file.

Special thanks to you for your good comments.

We tried our best to improve the manuscript and made some changes in the paper. Once again, thank you very much for your comments and suggestions.

Best regards,

Lin Zhou