TY - JOUR
T1 - Unprecedented Selenium and Lanthanide Simultaneously Bridging Selenotungstate Aggregates Stabilized by Four Tetra-vacant Dawson-like {Se2W14} Units
AU - Li, Hai Lou
AU - Liu, Ya Jie
AU - Li, Ya Min
AU - Chen, Li Juan
AU - Zhao, Jun Wei
AU - Yang, Guo Yu
N1 - Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/10/4
Y1 - 2018/10/4
N2 - In the presence of the larger [H2N(CH3)2]+ and K+ counter cations as structure-stabilizing agents, a class of unprecedented selenium and lanthanide (Ln) simultaneously bridging tetra-vacant Dawson-like selenotungstate aggregates [H2N(CH3)2]2Na9K2H19{[Ln4W4 Se4O22(H2O)5](Se2W14O52)2}2⋅60 H2O [Ln=TbIII (1), DyIII (2), HoIII (3), ErIII (4), TmIII (5), YbIII (6)] have been obtained by the one-pot assembly reaction of Na2WO4⋅2 H2O, Ln(NO3)3⋅6 H2O, and Na2SeO3 under moderately acidic aqueous conditions and the complexes were structurally characterized by elemental analyses, IR spectra, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. It should be noted that the appropriate molar ratio of Se/W is extremely important in the formation of 1–6 and can effectively ameliorate the yield of 1–6. Moreover, dimethylamine hydrochloride is also indispensable and plays a considerably important role in improving the solubility of Ln ions and stabilizing the structures of 1–6. The main polyoxoanion skeletons of 1–6 are constructed from two sandwich-type tetra-vacant Dawson-like {[Ln4W4Se4O22(H2O)5](Se2W14O52)2}16− half-units linked through two W-O-Ln bridges. The sandwich-type half-unit comprises two tetra-vacant Dawson-like [Se2W14O52]12− fragments encapsulating a unique dodecanuclear Se-Ln-W [Ln4W4Se4O22(H2O)5]8+ oxo cluster. Their solid-state visible and NIR fluorescent properties and lifetime decay behaviors were measured and their solid-state luminescent spectra mainly demonstrate the characteristic emission bands of Ln3+ ions. Moreover, the dominant wavelengths, the color purity, and correlated color temperatures of 1–5 have been also calculated. In addition, the luminous flux values of 1–5 are 2031, 6992, 3071, 921, and 477 lumen, respectively.
AB - In the presence of the larger [H2N(CH3)2]+ and K+ counter cations as structure-stabilizing agents, a class of unprecedented selenium and lanthanide (Ln) simultaneously bridging tetra-vacant Dawson-like selenotungstate aggregates [H2N(CH3)2]2Na9K2H19{[Ln4W4 Se4O22(H2O)5](Se2W14O52)2}2⋅60 H2O [Ln=TbIII (1), DyIII (2), HoIII (3), ErIII (4), TmIII (5), YbIII (6)] have been obtained by the one-pot assembly reaction of Na2WO4⋅2 H2O, Ln(NO3)3⋅6 H2O, and Na2SeO3 under moderately acidic aqueous conditions and the complexes were structurally characterized by elemental analyses, IR spectra, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. It should be noted that the appropriate molar ratio of Se/W is extremely important in the formation of 1–6 and can effectively ameliorate the yield of 1–6. Moreover, dimethylamine hydrochloride is also indispensable and plays a considerably important role in improving the solubility of Ln ions and stabilizing the structures of 1–6. The main polyoxoanion skeletons of 1–6 are constructed from two sandwich-type tetra-vacant Dawson-like {[Ln4W4Se4O22(H2O)5](Se2W14O52)2}16− half-units linked through two W-O-Ln bridges. The sandwich-type half-unit comprises two tetra-vacant Dawson-like [Se2W14O52]12− fragments encapsulating a unique dodecanuclear Se-Ln-W [Ln4W4Se4O22(H2O)5]8+ oxo cluster. Their solid-state visible and NIR fluorescent properties and lifetime decay behaviors were measured and their solid-state luminescent spectra mainly demonstrate the characteristic emission bands of Ln3+ ions. Moreover, the dominant wavelengths, the color purity, and correlated color temperatures of 1–5 have been also calculated. In addition, the luminous flux values of 1–5 are 2031, 6992, 3071, 921, and 477 lumen, respectively.
KW - lanthanides
KW - luminescent properties
KW - polyoxometalates
KW - selenotungstates
KW - tetra-vacant Dawson structure
UR - http://www.scopus.com/inward/record.url?scp=85053051670&partnerID=8YFLogxK
U2 - 10.1002/asia.201801010
DO - 10.1002/asia.201801010
M3 - Article
C2 - 30058758
AN - SCOPUS:85053051670
SN - 1861-4728
VL - 13
SP - 2897
EP - 2907
JO - Chemistry - An Asian Journal
JF - Chemistry - An Asian Journal
IS - 19
ER -