Novel 4s-4f heterometallic cluster substituted polyoxometalates Based on mixed dilacunary Keggin/open Wells-Dawson units: Syntheses, Crystal Structure and Luminescent study

Publication date: Available online 21 October 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Jing Zhang, Hao Yu, Ya-Nan Gu, Zhong Li, Xin-Xiong Li, Ling-Yun Li, Shou-Tian ZhengAbstractBy adopting a trilacunary [A-α-GeW9O34]10- as a precursor under hydrothermal conditions, a series of novel 4s-4f cluster substituted polyoxometalates (POMs) containing two types of in situ generated lacunary POM fragments have been made. These compounds were characterized by single-crystal X-ray diffractions, powder X-ray diffractions, infrared spectroscopy, thermogravimetric analyses, respectively. Structural analyses indicate that these compounds constructed from a seven-nuclearity K-O-Ln (Ln = Dy, Ho, Er) heterometallic cluster stabilized by mixed dilacunary Keggin [α-GeW10O37]10-/multilacunary open Well-Dawson [Ge2W18O66]16- fragments. Furthermore, the solid luminescent properties of the compounds at room temperature were studied.Graphical abstractA series of novel 4s-4f heterometallic cluster substituted polyoxometalates (POMs) with formula of H9Na12K2[K3Ln4(NO3)2(GeW10O37)2(Ge2W18O66)]·34H2O (1-Ln) (Ln = Dy、Ho、Er) have been hydrothermally made by adopting a trilacunary [A-α-GeW9O34]10- as a precursor. 1-Ln represent the first examples of metal-substituted POM clusters based on mixed POM fragments including dilacunary [α-GeW10O37]10- and multilacunary open Well-Dawson [Ge2W18O66]16- fragments.

Source: Inorganic Chemistry Communications - October 22, 2019 Category: Chemistry Source Type: research