Tiantian Gong, Yanan Chen, Shuo Wang, Miao Wang*, Junwei Zhao*
Chin. J. Struct. Chem., 2024, 43: 100370. DOI: 10.1016/j.cjsc.2024.100370
September 15, 2024
ABSTRACT
Currently,
organic–inorganic hybrid lanthanide-incorporated polyoxometalates (POMs) have
emerged as a prominent research area. Herein, we employed a simple raw material
assembly method to synthesize two neoteric mixed-organic -ligand-ornamented
lanthanide (Ln) incorporated selenotungstates [H2N(CH3)2]16Na2 [Ln4(H2O)6(HPZDA)2(HFMA)2W8O21][B-α-SeW9O33]4·29H2O (Ln = Sm3+ (1), La3+ (2); H2PZDA = 2,3-pyrazine dicarboxylic acid, H2FMA = fumaric acid). 1 and 2 are isomorphic with the polyanions constructed from
four trivacant Keggin [B-α-SeW9O33]8– ({SeW9}) segments and a rigid-flexible-ligand-ornamented
dodeca-nuclear W–Ln heterometallic [Ln4(H2O)6(HPZDA)2(HFMA)2W8O21]14+ cluster. Moreover, the solid-state fluorescence
spectrum of 1 at room temperature mainly exhibits the characteristic
emission peak of Sm3+ cations. Additionally, energy transfer from
{SeW9} to Sm3+ ions in 1 has been demonstrated by time-resolved spectroscopy.
This work presents a feasible dual-ligand synergistic strategy for constructing
novel POM derivatives and POM-based fluorescent materials.