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Incorporating polyoxometalates and organic ligands to pursue 3d-4f heterometallic clusters: a series of {Cr4Ln4} clusters stabilized by phthalic acid and [SiW12O40]4.

ABSTRACT: By introduction of trilacunary Keggin-type polyoxometalate to the hydrothermal reaction system of Cr3+, Ln3+ and phthalic acid, a series of novel {Cr4Ln4} heterometallic clusters with the formula Cs2[Cr4Ln4(μ4-O)4(μ3-O)4(C8H4O4)4(H2O)12](H3SiW12O40)Cl·23H2O (1-Ln, Ln = Ce, Pr, Nd) and [Cr4Ln4(μ4-O)4(μ3-O)4(C8H4O4)4(H2O)10](H6SiW12O40)Cl2·18H2O (2-Ln, Ln = Sm, Eu, Gd, Tb, Dy, Ho, Er) have been obtained. Single-crystal structural analyses show that 1-Ln and 2-Ln constitute the first cases of Cr-Ln heterometallic clusters stabilized by inorganic polyoxometalate anions and organic ligands. Optical spectra studies demonstrate that 1-Ln and 2-Ln are narrow-gap semiconductors with band gaps of about 1.5 eV. Magnetic investigation shows that compound 2-Dy is a potential single molecule magnet.

SUBMITTER: Gu YN 

PROVIDER: S-EPMC9063906 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Incorporating polyoxometalates and organic ligands to pursue 3d-4f heterometallic clusters: a series of {Cr<sub>4</sub>Ln<sub>4</sub>} clusters stabilized by phthalic acid and [SiW<sub>12</sub>O<sub>40</sub>]<sup>4</sup>.

Gu Ya-Nan YN   Zhao Dan D   Yu Hao H   Ge Rui R   Li Zhong Z   Tian Chong-Bian CB   Li Xin-Xiong XX   Sun Yan-Qiong YQ   Zheng Shou-Tian ST  

RSC advances 20190401 24

By introduction of trilacunary Keggin-type polyoxometalate to the hydrothermal reaction system of Cr<sup>3+</sup>, Ln<sup>3+</sup> and phthalic acid, a series of novel {Cr<sub>4</sub>Ln<sub>4</sub>} heterometallic clusters with the formula Cs<sub>2</sub>[Cr<sub>4</sub>Ln<sub>4</sub>(μ<sub>4</sub>-O)<sub>4</sub>(μ<sub>3</sub>-O)<sub>4</sub>(C<sub>8</sub>H<sub>4</sub>O<sub>4</sub>)<sub>4</sub>(H<sub>2</sub>O)<sub>12</sub>](H<sub>3</sub>SiW<sub>12</sub>O<sub>40</sub>)Cl·23H<sub>2</sub>O (1-Ln, Ln =  ...[more]

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