CAJ | 학술논문

构建一价阴离子(X=F-, Cl-, Br-, I-, NO-3, OH-)插层铜锌镁铝四元水滑石(CuZnMgAl-X)周期性计算模型,采用密度泛函理论(DFT),选取CASTEP程序模块,对体系进行几何全优化,从结合能、结构参数、Mul iken布居、氢键布居、态密度等角度研究了不同层间阴离子的分布形态以及其对主客体间超分子作用的影响.结果表明,随着CuZnMgAl-X体系层间阴离子电负性的减弱,电子逐渐从层间阴离子向层板发生转移,主客体间静电作用力逐渐减小,氢键强度逐渐降低,禁带宽度逐渐变窄,体系电子更易向高能级发生跃迁,稳定性逐渐下降.此外, Cu的掺杂使得CuZnMgAl-X体系的价带顶向高能量处发生偏移,禁带宽度较传统水滑石体系更窄,稳定性更低,进一步解释了含铜水滑石较难合成的原因.
구건일개음리자(X=F-, Cl-, Br-, I-, NO-3, OH-)삽층동자미려사원수활석(CuZnMgAl-X)주기성계산모형,채용밀도범함이론(DFT),선취CASTEP정서모괴,대체계진행궤하전우화,종결합능、결구삼수、Mul iken포거、경건포거、태밀도등각도연구료불동층간음리자적분포형태이급기대주객체간초분자작용적영향.결과표명,수착CuZnMgAl-X체계층간음리자전부성적감약,전자축점종층간음리자향층판발생전이,주객체간정전작용력축점감소,경건강도축점강저,금대관도축점변착,체계전자경역향고능급발생약천,은정성축점하강.차외, Cu적참잡사득CuZnMgAl-X체계적개대정향고능량처발생편이,금대관도교전통수활석체계경착,은정성경저,진일보해석료함동수활석교난합성적원인.
A periodic interaction model with different intercalated anions (X=F-, Cl-, Br-, I-, NO-3, OH?) is proposed for the CuZnMgAl quaternary hydrotalcites (CuZnMgAl-X). Based on density functional theory, the CuZnMgAl-X geometry was optimized using the CASTEP program. The distribution of anions in the interlayer, and the supra-molecular interaction between host layer and guest anions were investigated by analyzing binding energies, geometric parameters, Mul iken populations, hydrogen-bonding and densities of states. A decreased electronegativity of interlayer anion caused a transfer of charge from guest anions to host layer and a gradual decrease in the strength of electrostatic interaction and hydrogen bonding. The system band gap narrowed, electrons transferred to higher energy levels more easily, and the overal stability of the system decreased. The Cu dopant caused a deviation in CuZnMgAl-X valence band to high energies. Compared with traditional layered double hydroxides, the band gap narrowed and stability decreased, accounting for the difficulty in preparing copper-containing hydrotalcites.