The gas-phase fragmentations of a series of arylimido derivatives of hexamolybdate [Mo₆O₁₈(NC₆H_5-nR _n )]²⁻ (2–10, where R = CH₃, i-C₃H₇, OCH₃, NO₂; n = 1 or 2) versus the parent species [Mo₆O₁₉]²⁻ (1) were systematically studied using electrospray tandem mass spectrometry (ESI). Fragmentation of 1 generates two molybdate fragments only, [Mo₃O₁₀]²⁻ and [Mo₄O₁₃]²⁻, whereas decomposition of 2–10 went through two dissociation pathways in which path A generates a variety of molybdate fragments via breaking the Mo–N bond followed by the cleavages of the multiple Mo–O bonds, whereas path B produces a range of molybdate fragments with arylimido group via breaking the multiple Mo–O bonds on POM framework. Moreover, the presences of mixed-oxidation-state molybdate fragments are characteristic for the fragmentation. The gas-phase stability order obtained by energy-variable collision-induced dissociation (CID) experiment reveals that 2–10 are generally less stable than 1 and substitution on the benzene ring exerts a considerable effect on the stabilization of the hybrid clusters.

中文翻译：

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丙烯酰胺基官能化六钼酸盐[Mo 6 O 19] 2−的气相化学

一系列hexamolybdate的arylimido衍生物的气相分片[沫₆ ø ₁₈（NC ₆ ħ _{5- Ñ} ř _Ñ）] ^2-（2 - 10，其中- [R = CH ₃，我-C ₃ ħ ₇，OCH使用电喷雾串联质谱（ESI）系统地研究了₃，NO ₂；n = 1或2）与母体[Mo ₆ O ₁₉ ] ^2-（1）的关系。1的碎片 生成只有两个钼酸片段，[莫₃ ö ₁₀ ] ^2-和[沫₄ ø ₁₃ ] ^2-，而分解2 - 10通过在其中路径A经由破钼产生的各种钼酸盐片段的两个预解离途径去N键接着是多个Mo-O键的裂解，而路径B通过破坏POM框架上的多个Mo-O键产生一系列具有芳基的钼酸盐片段。此外，混合氧化态钼酸盐片段的存在是片段化的特征。通过能量可变碰撞诱导解离（CID）实验获得的气相稳定性顺序表明2 - 10比稳定通常少1和取代的苯环上施加混合簇的稳定性有很大影响。