Abstract
New molybdenum and tungsten methoxo clusters of the composition [M 6(μ 3-X) 8X 2(μ-OCH 3) 4/2]·2CH 3OH (M=Mo, W; X=Cl, Br), [Mo 6(μ 3-X) 8(OCH 3) 2(μ-OCH 3) 4/2]·CH 3OH (X=Cl, Br) and [Na(CH 3OH) 5] 2[Mo 6(μ 3-Br) 8(OCH 3) 6] containing bridging (μ), both bridging and terminal, or terminal methoxo groups, respectively, have been prepared. The preparation procedures, spectroscopic and physical properties, including X-ray photoelectron spectra (XPS) have been correlated. The crystal structure has been solved for [Na(CH 3OH) 5] 2[Mo 6(μ 3-Br) 8(OCH 3) 6]. The compound crystallizes in the triclinic crystal system. The structure is built of two [Na(CH 3OH) 5] + cations and the [Mo 6(μ 3-Br) 8(OCH 3) 6] 2− anion. All six-oxygen atoms from coordinated methoxo groups are acceptors of hydrogen of coordinated methanol molecules from the six neighbouring cations making a three-dimensional packing network.
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