Monolacunary Keggin polyoxometalates connected to ten 4d or 4f metal atoms.
The rational self-assembly of mono-lacunary Keggin clusters with 4d and 4f metal salts via a conventional method has yielded two novel polyoxometalate-based 4d-4f heterometallic compounds containing lacunary Keggin anions connected to ten metal atoms: {[Ag{Ag2(H2O)4}{Ln(H2O)6}2H ⊂ {SiW11Ln(H2O)4O39}2]·nH2O (Ln = Ce and n = 7 for 1, Ln = Pr and n = 3 for 2). Their structures were determined by single crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and thermogravimetric (TG) analyses. A structural feature in 1 and 2 is that each [SiW11O39](8-) cluster (SiW11) is connected to ten metals (five Ag(+) and five Ln(3+) cations), representing the highest number of connected metal atoms to any mono-lacunary Keggin anion to date. This large connectivity leads to a structure with a purely inorganic 3D framework with two kinds of channels along the [100] and [010] directions. The magnetic properties of both compounds show the expected magnetic moments (0.8 and 1.6 amu K mol(-1) per Ce(3+) and Pr(3+) ion, respectively) and confirm the presence of isolated Ce(3+) and Pr(3+) ions.
Key Lab of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China. jpeng@nenu.edu.cn.
Haijun
H
Pang
Carlos J
CJ
Gómez-García
Jun
J
Peng
Huiyuan
H
Ma
Chunjing
C
Zhang
Qingyin
Q
Wu
D002563:Cerium / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D060328:Magnetic Phenomena; D015394:Molecular Structure; D011221:Praseodymium / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013818:Thermogravimetry; D017973:Tungsten Compounds / Q000737:chemistry; D014961:X-Ray Diffraction; D000099294:Polyoxometalates
D002563:Cerium; D056831:Coordination Complexes; D011221:Praseodymium; D012834:Silver; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates