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Three Types of Mixed Alkali‐Metal‐, Transition‐Metal‐, or Rare‐Earth‐Substituted Sandwich‐Type Arsenotungstates with Supporting Rare‐Earth Pendants
Author(s) -
Luo Jie,
Jin Guangfeng,
Zhang Fang,
Liu Yun,
Chen Lijuan,
Xie Songqiang,
Zhao Junwei
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201701061
Subject(s) - chemistry , alkali metal , alkaline earth metal , transition metal , rare earth , crystallography , bromide , metal , photoluminescence , inorganic chemistry , mineralogy , organic chemistry , materials science , catalysis , optoelectronics
Three types of mixed alkali‐metal‐, transition‐metal‐, or rare‐earth‐substituted sandwich‐type arsenotungstates with supporting rare‐earth pendants, namely, [La(H 2 O) 8 ] 2 H[K 2 LaCu 3 (H 2 O) 9 ][B‐α‐AsW 9 O 33 ] 2 · 17H 2 O ( 1 ), Na 2 K 0.5 RE 0.5 [RE(H 2 O) 8 ][K 3 Cu 2 WO(H 2 O) 10 ][B‐α‐AsW 9 O 33 ] 2 · 14H 2 O [RE = Pr 3+ ( 2 ), Nd 3+ ( 3 ), Sm 3+ ( 4 ), Eu 3+ ( 5 )], and K 2 H[Pr(H 2 O) 6 ][Pr(H 2 O) 7 ][K 2 NaCu 3 (H 2 O) 7 ][B‐α‐AsW 9 O 33 ] 2 · 18H 2 O ( 6 ), were synthesized in aqueous solution. The utilization of different alkali‐metal cations led to the formation of three structural types. If only K + cations were utilized in the system, 1 was obtained, whereas 2 – 6 formed when Na + and K + cations were used. In addition, the common characteristic of 1 – 6 is that they consist of hexanuclear heterometal‐substituted sandwich‐type arsenotungstate structural units, and the hexanuclear heterometallic clusters in the central belt are distributed in a 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 the RE cations. The drug activities of 4 and 5 were measured through 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide (MTT) assays, and the results demonstrate that 4 can induce the apoptosis of HepG2 cells and HCT‐116 cells through the activation of 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.