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首页> 外文期刊>Structural Chemistry >On the asymmetry in molybdenum-oxygen bonding in the MoO _3 structure: ETS-NOCV analysis
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On the asymmetry in molybdenum-oxygen bonding in the MoO _3 structure: ETS-NOCV analysis

机译:MoO _3结构中钼-氧键的不对称性:ETS-NOCV分析

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In the present study, the analysis of natural orbitals for chemical valence (NOCV) combined with the extended-transition-state (ETS) bond-energy decomposition method (ETS-NOCV) was applied to characterize an asymmetry in Mo-O bonding in MoO _3 crystal. Considered were three non-equivalent oxygen sites (O1, O2, O3) in the Mo _7O _(30)H _(18) cluster model of (010) surface of MoO _3. The ETS-NOCVmethod leads to the conclusion that an increase in the Mo-O distances, from 1.68 ? (for Mo-O1), through 1.73 ? (for Mo-O2), up to 1.94 ? (for Mo-O3), is directly related to decrease in strength of both σ-and π-contributions of Mo-O bond. Further, Mo-O connection appeared to exhibit both ionic (the charge transfer from 2p orbital of oxygen to molybdenum) and the covalent (charge accumulation in the region of Mo-O) components. Finally, the trend in the orbital energy stabilization (δEorb) originating from the dominant σ-and π-bond contributions appeared to correlate very well with the oxygen-vacancy formation energies published earlier by Tokarz-Sobieraj et al. (Surf Sci 489:107, 2001).
机译:在本研究中,结合扩展价态(ETS)键-能量分解方法(ETS-NOCV)的化学价(NOCV)的天然轨道分析被用于表征MoO中Mo-O键的不对称性_3水晶。在MoO _3的(010)表面的Mo _7O _(30)H _(18)簇模型中,考虑了三个非等价的氧位点(O1,O2,O3)。 ETS-NOCV方法得出的结论是Mo-O距离从1.68?增加。 (对于Mo-O1),直至1.73? (对于Mo-O2),最高可达1.94? (对于Mo-O3),与Mo-O键的σ和π贡献强度的下降直接相关。此外,Mo-O连接似乎表现出离子性(电荷从氧的2p轨道转移到钼的电荷)和共价(电荷在Mo-O区域中积累)组成。最后,源于主导的σ键和π键的轨道能量稳定趋势(δEorb)似乎与Tokarz-Sobieraj等人早先发表的氧空位形成能很好地相关。 (Surf Sci 489:107,2001)。

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