Rare-Earth and Antimony-Oxo Clusters Simultaneously Connecting Antimonotungstates Comprising Divacant and Tetravacant Keggin Fragments.

Author(s) Xu, X.; Chen, Y.; Zhang, Y.; Liu, Y.; Chen, L.; Zhao, J.
Journal Inorg Chem
Date Published 2019 Aug 15
Abstract

Four novel rare-earth (RE) and Sb-oxo clusters simultaneously bridging antimonotungstates (ATs) [HN(CH)]NaH{[RE(HO)SbO](SbWO)(SbWO)}·24HO [RE = Dy (), Er (), Y (), Ho ()] were triumphantly isolated by using Na[B-α-SbWO]·19.5HO, dimethylamine hydrochloride, SbCl, and RE(NO)·6HO in acidic aqueous solution. Their tetrameric polyoxoanions are all established by two [SbWO] and two [B-α-SbWO] segments encapsulating a RE-Sb heterometal [RE(HO)SbO] cluster. Under the O→W LMCT excitation at 268 nm of AT segments, RE ions in and can absorb the T→A emission energy of AT segments, giving rise to the sensitization of AT segments to the emission of RE ions. Through the sensitization of AT segments, the emission intensities of RE ions in and are increased and lifetimes are prolonged. Photoluminescence and energy transfer measurements indicate that Dy ions in can obtain more energy from AT segments than to Er ions in . Furthermore, the sensitization effects of AT segments to different - transitions of RE ions have been compared in and . Under the sensitization of AT segments, the F→H transition obtains the most energy compared with the F→H and F→H transitions in , and the H→I transition obtains more energy than the S→I transition in . It seems that the better energy level match of T→A transition of AT segments with - emission transitions of RE ions will lead to a stronger sensitization effect.

DOI 10.1021/acs.inorgchem.9b01570
ISSN 1520-510X
Citation Xu X, Chen Y, Zhang Y, Liu Y, Chen L, Zhao J. Rare-Earth and Antimony-Oxo Clusters Simultaneously Connecting Antimonotungstates Comprising Divacant and Tetravacant Keggin Fragments. Inorg Chem. 2019.

Related Applications, Forms & Industries