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1. The assignment of the oxidation states for the Eu atoms is consistent with the charge and confirmed by bond valence sum calculations. The valence sums for the two Eu atoms are 2.79 and 3.22, respectively, which are in good agreement with the expected bond valence of 3.00.£¨Inorganic Chemistry, Vol. 46, No. 4, 2007£¬ 1171£©
2. So, we have used bond order calculations to confirmthe coordination environment of Pb centers. The analysis of bond valences reveals that the valences associated with the existing Pb-O bonds are 1.921 for Pb1 and 1.804 for Pb2.£¨Inorganic Chemistry,  No. 48, 2009£¬6517£©
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