4 years ago

Three Types of Mixed Alkali-Metal, Transition-Metal or / and Rare-Earth Substituted Sandwich-Type Arsenotungstates with Supporting Rare-Earth Pendants

Songqiang Xie, Lijuan Chen, Yun Liu, Junwei Zhao, Fang Zhang, Guangfeng Jin, Jie Luo
Three types of mixed alkali-metal, transition-metal or / and rare-earth substituted sandwich-type arsenotungstates with supporting rare-earth pendants [La(H2O)8]2H[K2LaCu3(H2O)9][B-α-AsW9O33]2*17H2O (1) and Na2K0.5RE0.5[RE(H2O)8][K3Cu2WO(H2O)10][B-α-AsW9O33]2*14H2O [RE = Pr3+ (2), Nd3+ (3), Sm3+ (4), Eu3+ (5)] and K2H[Pr(H2O)6][Pr(H2O)7][K2Na Cu3(H2O)7][B-α-AsW9O33]2*18H2O (6) were synthesized in aqueous solution. It should be pointed out that the utilization of different alkaline cations led to the formation of three structural types. When only K+ cations was utilized in the system, 1 was obtained while Na+ and K+ cations were used, 2-6 were found. In addition, the common characteristic of 1-6 is that they consist of hexa-nuclear heterometal substituted sandwich-type arsenotungstate structural units and hexa-nuclear heterometal clusters in the central belt are distributed in the triangular fashion. The solid-state photoluminescence spectra of 2, 3, 4 and 5 at ambient temperature are mainly derived from the f-f electron transitions of RE cations. The drug activities of 4 and 5 were measured by using MTT assay and the final results demonstrate that 4 can induce the apoptosis of HepG2 cells and HCT-116 cells through activating Caspase-3 and the autophagy of HepG2 cells and HCT-116 cells through the involvement of lysosomes. The coexistence of apoptosis and autophagy leads to the death of cancer cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701061

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