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Oxalate-bridging NdIII-based arsenotungstate with multifunctional NIR-luminescence and magnetic properties
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-16 , DOI: 10.1039/d2dt01066f Hanhan Chen 1 , Lin Sun 1 , Kangting Zheng 1 , Jinpeng Zhang 1 , Pengtao Ma 1 , Jingping Wang 1 , Jingyang Niu 1
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-16 , DOI: 10.1039/d2dt01066f Hanhan Chen 1 , Lin Sun 1 , Kangting Zheng 1 , Jinpeng Zhang 1 , Pengtao Ma 1 , Jingping Wang 1 , Jingyang Niu 1
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Oxalate bridged Nd-based arsenotungstate, K14Na6H4[{(As2W19O67(H2O))Nd(H2O)2}2(C2O4)]·64H2O (1), was obtained from the reaction of K14[As2W19O67(H2O)], oxalic acid, and NdCl3·6H2O in mildly acidic aqueous solution. The polyanion exhibits a dimeric structure in which the fully deprotonated oxalate ligands bridge two NdIII cations and the arsenotungstate anions act as blocking ligands. The photoluminescence (PL) spectrum of 1 shows the characteristic emission peak of NdIII in the near-infrared (NIR) region. However, the O → W charge-transfer transitions of arsenotungstate cannot effectively sensitize the emission of NdIII cations as confirmed by the emission spectrum, due to the mismatch of the energy gap between 3T1u → 1A1g (21.57 × 103 cm−1) of arsenotungstate components and 4F3/2 → 4I9/2 (11.43 × 103 cm−1) of NdIII cations. Magnetic studies of 1 demonstrate its field-induced single-molecule magnet (SMM) behavior. Direct current magnetic susceptibility studies imply the weak ferromagnetic couplings present between the two neighboring NdIII cations. In addition, the synergy between the coordination configuration of NdIII cations and the intramolecular magnetic interaction was discussed.
中文翻译：
具有多功能近红外发光和磁性的草酸盐桥接 NdIII 基砷钨酸盐
草酸盐桥接Nd基砷钨酸盐，K 14 Na 6 H 4 [{(As 2 W 19 O 67 (H 2 O))Nd(H 2 O) 2 } 2 (C 2 O 4 )]·64H 2 O ( 1 )，由 K 14 [As 2 W 19 O 67 (H 2 O)]、草酸和 NdCl 3 ·6H 2反应得到O 在弱酸性水溶液中。聚阴离子表现出二聚体结构，其中完全去质子化的草酸盐配体桥接两个 Nd III阳离子，而砷钨酸盐阴离子充当封闭配体。1的光致发光（PL）光谱显示了Nd III在近红外（NIR）区域的特征发射峰。然而，由于3 T 1u → 1 A 1g (21.57 × 10 3 cm -1) 的砷钨酸盐组分和Nd III阳离子的4 F 3/2 → 4 I 9/2 (11.43 × 10 3 cm -1 )。1的磁性研究证明了其场致单分子磁体 (SMM) 行为。直流磁化率研究表明两个相邻的 Nd III阳离子之间存在弱铁磁耦合。此外，还讨论了 Nd III阳离子的配位构型与分子内磁相互作用之间的协同作用。
更新日期：2022-06-16
中文翻译：
具有多功能近红外发光和磁性的草酸盐桥接 NdIII 基砷钨酸盐
草酸盐桥接Nd基砷钨酸盐，K 14 Na 6 H 4 [{(As 2 W 19 O 67 (H 2 O))Nd(H 2 O) 2 } 2 (C 2 O 4 )]·64H 2 O ( 1 )，由 K 14 [As 2 W 19 O 67 (H 2 O)]、草酸和 NdCl 3 ·6H 2反应得到O 在弱酸性水溶液中。聚阴离子表现出二聚体结构，其中完全去质子化的草酸盐配体桥接两个 Nd III阳离子，而砷钨酸盐阴离子充当封闭配体。1的光致发光（PL）光谱显示了Nd III在近红外（NIR）区域的特征发射峰。然而，由于3 T 1u → 1 A 1g (21.57 × 10 3 cm -1) 的砷钨酸盐组分和Nd III阳离子的4 F 3/2 → 4 I 9/2 (11.43 × 10 3 cm -1 )。1的磁性研究证明了其场致单分子磁体 (SMM) 行为。直流磁化率研究表明两个相邻的 Nd III阳离子之间存在弱铁磁耦合。此外，还讨论了 Nd III阳离子的配位构型与分子内磁相互作用之间的协同作用。
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