A terbium-antimony-oxo-cluster bridging antimonotungstate comprising divacant and tetravacant Keggin segments

Publication date: Available online 7 November 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Xin Xu, Jun Jiang, Da Li, Saisai Xie, Lulu Liu, Baoxing Zeng, Lijuan Chen, Junwei ZhaoAbstractA terbium-antimony-oxo-cluster bridging antimonotungstate (AT) [H2N(CH3)2]8Na6H8{[Tb4(H2O)6Sb6O4](SbW10O37)2 (B-α-SbW8O31)2}·24H2O (1) was successfully prepared by reaction of Na9[B-α-SbW9O33]·19.5H2O, SbCl3, Tb(NO3)3·6H2O and dimethylamine hydrochloride (DMA·HCl) in acidic aqueous solution. Its tetramer polyanion consists of two divacant [SbW10O37]11− and two tetravacant [B-α-SbW8O31]11− fragments linked by two [Tb2(H2O)3Sb3O2]11+ clusters. The photoluminescence emission spectra and lifetime decay curves of 1 are collected respectively under the most f−f excitation at 368 nm and O→W LMCT excitation at 268 nm. The sensitization of AT fragments can enhance the f−f transition emission intensity of Tb3+ ions and prolong the lifetime of Tb3+ ions. The time-resolved emission spectrum of 1 reveals that the decay rate of characteristic emission peaks of Tb3+ ions has been inhibited because of the sensitization effect of AT fragments to Tb3+ ions. The emission spectra under different excitation wavelengths indicate that the excitation at 268 nm from O→W LMCT is the most suitable excitation and can obtain the strongest emission spectrum of 1. Their corresponding CIE coordinates demonstrate that the emission colors of 1 can be tuned by changing different excitation waveleng...

Source: Inorganic Chemistry Communications - November 9, 2019 Category: Chemistry Source Type: research