Two Heart-Shaped Carboxylate-Substituted Selenotungstates with Photochromic Properties
Yizhen Song1, Jingru Lei1, Bingyu Li1
1Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, Henan 475004, China.
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Two carboxylate-substituted selenotungstates with heart-shaped structures were successfully synthesized via the reaction of Na2SeO3, Na2WO4·2H2O, dl-malic acid/glycolic acid, and dimethylamine hydrochloride in an aqueous solution. The chemical formulas of these compounds are [(CH3)2NH2]8Ba2Na2(H2O)7[Se4W31O104(OH)4(H2O)(MalH)2]·18H2O (1) and [(CH3)2NH2]12Ba3(H2O)8[Se4W31O108(H2O)(Gca)2]·20H2O (2) [Mal = malate; Gca = glycolate]. The most notable structural characteristic of these compounds is the presence of a carboxylate-substituted selenotungstate framework, a feature that is relatively uncommon among the previously reported selenotungstates. Furthermore, the experimental results demonstrate that these compounds exhibit photochromic properties.
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