arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2602.15534cond-mat.mtrl-sciphysics.chem-ph
收藏

用于金属有机框架的反应粗粒化力场:应用于ZIF-8自组装建模

Reactive Coarse Grained Force Field for Metal-Organic Frameworks applied to Modeling ZIF-8 Self-Assembly

Sorbonne Université(索邦大学);University of Warwick(华威大学)

Sangita Mondal, Cecilia M. S. Alvares, Rocio Semino

AI总结:

本文提出了一种用于金属有机框架的反应性粗粒化力场,用于建模ZIF-8的自组装过程。

摘要:

解码金属有机框架的自组装机制是减少其合成协议中试错测试的关键步骤。原子级模拟已被证明在揭示MOF成核的分子级特征方面至关重要,但仍然由于尺寸限制而在模拟设置中存在局限性(无法达到现实的浓度或探索非化学计量的金属:配体比例)。在本研究中,我们开发了一种方法,通过多尺度粗粒化方法推导出反应性粗粒化力场。我们将我们的新方法应用于典型晶质咪唑盐框架ZIF-8的情况。我们所开发的粗粒化力场,称为nb-CG-ZIF-FF,不包含任何显式连接信息,但通过原子级基准中的多体相关性学习了四面体Zn连接。nb-CG-ZIF-FF在原子级基准中定量重现了ZIF-8的体相、晶体结构以及预成核物种的结构演变,特别是在Zn n-fold配位人口方面。虽然nb-CG-ZIF-FF能够很好地捕捉合成过程中形成的环范围,但该模型无法精确重现环人口。我们的反应性CG力场拟合方法可以应用于任何MOF,为建模MOF的形成、分解、缺陷动态和相变过程开辟了新的研究途径。

英文摘要:

Decoding the self-assembly mechanism of metal-organic frameworks is a crucial step in reducing trial-and-error tests in their synthesis protocols. Atomistic simulations have proven essential in revealing molecular-level features of MOF nucleation, but they still exhibit limitations in the simulation setups due to size constraints (inability of reaching realistic concentrations or exploring non-stoichiometric metal:ligand ratios). In this contribution, we develop a methodology to derive reactive coarse grained force fields based on multiscale coarse graining methods. We apply our novel methodology to the case of the archetypal zeolitic-imidazolate framework ZIF-8. Our coarse grained force field, which we call nb-CG-ZIF-FF, does not contain any explicit connectivity information, but learns the tetrahedral Zn-connectivity from many body correlations within an atomistic benchmark. nb-CG-ZIF-FF quantitatively reproduces the features of bulk, crystalline ZIF-8 as well as the structural evolution of pre-nucleation species in terms of Zn n-fold coordination populations from the atomistic benchmark. While the range of rings that are formed along the synthesis process are well captured by nb-CG-ZIF-FF, the model cannot exactly reproduce ring populations. Our reactive CG force field fitting approach can be applied to any MOF, opening new research avenues in modeling MOF formation, decomposition, defect dynamics and phase transition processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑