Synthesis and Crystal Structure of K6.5H4.5[CeK2(SiW11O39)2]·26H2O
Titel:
Synthesis and Crystal Structure of K6.5H4.5[CeK2(SiW11O39)2]·26H2O
Auteur:
Niu, Jingyang Wang, Ziliang Wang, Jingping
Verschenen in:
Journal of coordination chemistry
Paginering:
Jaargang 56 (2003) nr. 10 pagina's 895-901
Jaar:
2003-07-01
Inhoud:
The title compound, K6.5H4.5[CeK2(SiW11O39)2]·26H2O was prepared and its structure characterized by IR and single crystal X-ray structural analysis. It belongs to triclinic, space group P1 with a = 12.719(3) Å, b = 16.658(4) Å, c = 23.075(6) Å, α = 94.41(2)°, β = 98.90(2)°, γ = 92.40(2)°; V = 4809(2) Å-3, Z = 2, Dc = 4.344 g cm-3, μ = 27.170 mm-1, F (000) = 5519. The results show that the cerium and two potassium atoms link the two anionic units SiW11 through O-Ce-O and O-K-O bridges and construct the double 1 : 11 series heteropolytungstate. Furthermore, cerium is coordinated to eight oxygen atoms (four Oc and four Ob) from two tetradentate SiW11 ligands forming a square anti-prism. The coordination numbers for K1 and K2 are 8 and 7, respectively.