Organic–Inorganic Two-Dimensional Hybrid Networks Constructed from Pyridine-4-Carboxylate-Decorated Organotin–Lanthanide Heterometallic Antimotungstates

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Six organic–inorganic hybrid pyridine-4-carboxylate-decorated organotin (OT)–lanthanide (Ln) heterometallic antimotungstates [Ln(H 2 O) 6 (pca)]H[Sn(CH 3 ) 2 (H 2 O)] 3 [B-β-SbW 9 O 33 ]·12H 2 O [Ln = La 3+ ( 1 ), Ce 3+ ( 2 ), Pr 3+ ( 3 ), Nd 3+ ( 4 ), Sm 3+ ( 5 ), Eu 3+ ( 6 ); Hpca = isonicotinic acid] have been prepared with the help of the structure-directing effect of the trivacant [B-α-SbW 9 O 33 ] 9– segment toward [(CH 3 ) 2 Sn] 2+ and Ln 3+ ions in an acidic water medium. The prominent architecture characteristic is that their structural units consist of a trivacant [B-β-SbW 9 O 33 ] 9– segment stabilized by three [Sn(CH 3 ) 2 (H 2 O)] 2+ groups and a [Ln(H 2 O) 6 (pca)] 2+ cation, which are interconnected to propagate an intriguing two-dimensional (2D) network. For all we know, 1 – 6 stand for the first 2D OT–Ln heterometallic polyoxometalates. Furthermore, luminescence performances of solid-state 3 – 6 were deeply surveyed at ambient temperature. Energy migration from [B-β-SbW 9 O 33 ] 9– and pca – to Sm 3+ centers in 5 was also studied. Comparative studies demonstrate that the contribution of [B-β-SbW 9 O 33 ] 9– sensitizing the emission of Sm 3+ is prominently larger than that of pca – sensitizing the emission of Sm 3+ in the emission process of 5 . Most interestingly, 6 as a fluorescence probe exhibits high selectability and sensitivity for recognizing Zn 2+ and Cu 2+ in water.