中文摘要：

报道2-（咪唑[1,2-α]吡啶-2-基）-2-氧代乙酸自由基及其高氯酸盐的晶体结构，探索了晶体堆积结构或超分子相互作用与磁性能的关系．在两个晶体结构中，超分子相互作用（氢键、原子间密接触、负离子-π电子或孤对-π）使2-（咪唑[1,2-α]吡啶-2-基）-2-氧代乙酸自由基主要以抗磁性的二聚体存在并导致了低的磁化率．该自由基晶体展示了准一维的柱状堆积链和弱的反铁磁性，而氢键和负离子-π作用则诱导高氯酸晶体呈一维双股链结构并显示了弱的铁磁性．

英文摘要：

We herein report two crystals based on 2-（imidazo[1,2-a]pyridin-2-yl）-2-oxoacetic acid rad- ical and its perchlorate, and investigate the relationship between magnetic properties and crystal stacking structures or supramolecular interactions. 2-（imidazo[1,2-a]pyridin-2-yl）- 2-oxoaeetic acid radical in two crystals mainly exist as diamagnetic dimer formed via short atomic contacts or supramolecular interactions （hydrogen bonds, anion-Tr or lone- pair-~r interactions）, leading to low magnetic susceptibilities. 2-（imidazo[1,2-a]pyridin-2-yl）- 2-oxoaeetic acid radical crystal exhibits quasi-one-dimensional columnar stacking chain and weak antiferromagnetism. However, its perchlorate crystal possesses one-dimensional double- stranded chain structure assembled through double hydrogen bonds and anion-To interactions, and reveals weak ferromagnetism.