Three kinds of lanthanide (Ln)-substituted borotungstates
including
[BW11O39]9– segments KH2[Ce(H2O)8][(α-BW11O39)Ce(H2O)3]·14H2O (1), K2Na2H2[(α-BW11O39)Pr(H2O)3]·15H2O (2), and Na3K8H[W5O18]Ln[α-BW11O39]·22H2O [Ln = Eu3+ (3), Dy3+ (4), Ho3+ (5), Yb3+ (6)] were manufactured. Compound 1 adopts a one-dimensional (1-D) zigzag chain by fusing adjacent
[Ce(H2O)8][(α-BW11O39)Ce(H2O)3]3– polyoxoanions in the help of Ce3+ bridging. It is worth
noting that adjoining chains can be interacted with each other by
K+ cations and give birth to a fascinating two-dimensional
sheet. In contrast, the polyoxoanion of 2 is assembled
from a mono-PrIII embedded [(α-BW11O39)Pr(H2O)3]6– unit, which also propagates an analogical 1-D chain like 1 without hanging [Ln(H2O)8]3+ cations.
Compounds 3–6 display a typical mixed-POM
dimeric assembly composed of monovacant Keggin [α-BW11O39)]9– and monovacant Lindqvist [W5O18]6– segments concatenated
by an Ln cation. Luminescence performances of 3–5 were systematically probed at ambient temperature, exhibiting
the featured emissions from f–f transitions of Ln ions. Meanwhile,
energy transfer from borotungstate fragment to Ho3+ ion
was observed in the emission process of 5.
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