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Question 6: Why was the pH for the Cd solution 5.5, while it was 4.5 for Zn and Cu. It would be more systematic, and easier to determine a metal ion influence on structure, if this were kept the same (say 5.5) for all three cases instead of changing. It makes it harder to determine if the changes are due to changing metal ion or due to the difference in pH.²»ÖªµÀÔõô»Ø´ð£¬¸ü²»ÖªµÀÔõô²¹³äÐÅÏ¢¡£

Question 8: The luminescence section needs further discussion. Why does [1] have two emission bands like the ligand, but [2] and [3] do not? Could the presence of ox ligand be having an effect? Could it be topological in nature, i.e. ligand-ligand interactions, quenching, etc.? Further effort to explain the observed luminescence properties of these materials is warranted.Õâ¸öÎÊÌâÌØ±ð¿Á¿Ì£¬²»ÖªµÀÈçºÎ»Ø´ð£¿

Question 1:The incorporation of oxalates in the framework of compound 2 and not in compound 1,  is explained by the elevation of the pH value from 5.5 for 1 to 7.5 for 2. However, at both pH values, the oxalate should be completely deprotonated (pK values are approximately 1.2 and 4.3). Also, if the pH is the only parameter, compounds 3 and 4 formed at pH=4.5 should not incorporate the oxalate anions in the framework. I recommend measurement of the pH of the reaction mixture after stirring for 30 min and at the end of the hydrothermal reaction, before considering the role of the pH.Õâ¸öÎÊÌâͬÑùÈç´Ë²»ÖªµÀÔõô»Ø´ð¡£

Question 2: The nitrogen adsorption isotherm should be completed to reach the saturation plateau and the value of specific area should be determined. The effective free volume alone, calculated with PLATON, is not very informative.Õâ¸öÎÊÌâÒ²ÊÇÒ»ÑùÄѻشð¡£

Question 4: What are the possible reasons for the absence of a luminescence peak around 400 nm in compounds 2 and 3?

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