Syntheses and Molecular Structures of New Calix[4]arene Molybdenum and Tungsten Complexes

Syntheses and Molecular Structures of New Calix[4]arene Molybdenum and Tungsten Complexes
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新型杯[4]芳烃钼钨配合物的合成及分子结构

DOI:
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发表时间:
2001
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通讯作者:
U. Radius
U. Radius
中科院分区:
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文献类型:
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作者:
J. Attner;U. Radius

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在对叔丁基杯[4]芳烃(Cax(OH)4)和三乙胺存在下,钼(IV)和钨(IV)的氯化物[MCl 4L 2](M=Mo,L = Et 2S,Et 2 O; M=W; L= Et 2S)发生不寻常的反硝化反应,生成d 0配合物[(CaxO 4){CaxO 2(OH)2}M](1)和d3化合物(HNEt 3)2[(CaxO 4)2 M2](2)。对配合物1 a(M=Mo)、1 B(M=W)及2 a(M=Mo)的HCl加合物进行了结构表征。化合物Ia代表[Mo(OR)6]类型的充分表征的钼(VI)六烷氧基络合物的少数实例之一。副产物[(CaxO 4 W){κ2(O)-κ1(O)-CaxO 3(OH)}(CaxO 4 WCl)](3)的分离和结构表征表明含氯杯[4]芳烃络合物在这些反应混合物中的中间体。1 a与HCl反应得到[CaxO 4 MoCl 2](4 a),其为通式为[MoClx(OR)6−x]的混合钼(VI)烷氧基卤化物化合物的第一个明确定义的实例。
An unusual disproportionation reaction of the molybdenum(IV) and tungsten(IV) chlorides [MCl4L2] (M=Mo, L=Et2S, Et2O; M=W; L=Et2S) in the presence of p-tBu-calix[4]arene (Cax(OH)4) and triethylamine leads to d0 complexes [(CaxO4){CaxO2(OH)2}M] (1) and d3 compounds (HNEt3)2[(CaxO4)2M2] (2). Complexes 1 a (M=Mo), 1 b (M=W), and the HCl adduct of 2 a (M=Mo) have been structurally characterized. Compound 1 a represents one of the few examples of a well-characterized molybdenum(VI) hexa-alkoxide complex of the type [Mo(OR)6]. Isolation and structural characterization of the side product [(CaxO4W){κ2(O)-κ1(O)-CaxO3(OH)}(CaxO4WCl)] (3) suggests the intermediacy of chloro-containing calix[4]arene complexes in these reaction mixtures. The reaction of 1 a with HCl provides [CaxO4MoCl2] (4 a), the first well-defined example of a mixed molybdenum(VI) alkoxide halide compound of the general formula [MoClx(OR)6−x].