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arXiv 2602.20195cond-mat.mtrl-scics.LG
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OrgFlow: 从分子图生成有机晶体结构的生成建模

OrgFlow: Generative Modeling of Organic Crystal Structures from Molecular Graphs

Drexel University, College of Computing and Informatics(德雷塞尔大学,计算机与信息学院);Drexel University, Department of Chemical and Biological Engineering(德雷塞尔大学,化学与生物工程系)

Mohammadmahdi Vahediahmar, Matthew A. McDonald, Feng Liu

AI总结:

OrgFlow通过生成建模方法从分子图直接预测有机晶体结构,实现更高的匹配率和更高效的推理过程。

摘要:

晶体结构预测是材料科学中的长期挑战,大多数数据驱动方法都是为无机系统开发的。这为有机晶体留下了一个重要的空白,有机晶体是药物、聚合物和功能材料的核心,但存在独特的挑战,如更大的单位细胞和严格的化学连接性。我们介绍了一种流匹配模型,直接从分子图预测有机晶体结构。该架构整合了分子连接性与周期边界条件,同时保持晶体系的对称性。一种基于键的损失引导模型朝着现实的局部化学发展,通过强制键长和连接性的分布。为了支持可靠且高效的训练,我们构建了一个有机晶体的精编数据集,以及一个预计算键和边的预处理管道,显著减少了训练和推理期间的计算开销。实验表明,我们的方法在匹配率方面比现有基线高超过10倍,同时在推理中需要更少的采样步骤。这些结果确立了生成建模作为有机晶体结构预测的实用且可扩展的框架。

英文摘要:

Crystal structure prediction is a long-standing challenge in materials science, with most data-driven methods developed for inorganic systems. This leaves an important gap for organic crystals, which are central to pharmaceuticals, polymers, and functional materials, but present unique challenges, such as larger unit cells and strict chemical connectivity. We introduce a flow-matching model for predicting organic crystal structures directly from molecular graphs. The architecture integrates molecular connectivity with periodic boundary conditions while preserving the symmetries of crystalline systems. A bond-aware loss guides the model toward realistic local chemistry by enforcing distributions of bond lengths and connectivity. To support reliable and efficient training, we built a curated dataset of organic crystals, along with a preprocessing pipeline that precomputes bonds and edges, substantially reducing computational overhead during both training and inference. Experiments show that our method achieves a Match Rate more than 10 times higher than existing baselines while requiring fewer sampling steps for inference. These results establish generative modeling as a practical and scalable framework for organic crystal structure prediction.

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。

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