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Crystal Structure and Magnetic Property of 2-(Imidazo[1,2-a]pyri-din-2-yl)-2-oxoacetic Acid and Its Perchlorate
Chen Shen,Yi-man Zhang,Guo-ping Yong*
Author NameAffiliationE-mail
Chen Shen Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Yi-man Zhang Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Guo-ping Yong* Department of Chemistry, University of Science and Technology of China, Hefei 230026, China gpyong@ustc.edu.cn 
Abstract:
We herein report two crystals based on 2-(imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical 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-oxoacetic acid radical in two crystals mainly exist as diamagnetic dimer formed via short atomic contacts or supramolecular interactions (hydrogen bonds, anion-π or lonepair-π interactions), leading to low magnetic susceptibilities. 2-(Imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical crystal exhibits quasi-one-dimensional columnar stacking chain and weak antiferromagnetism. However, its perchlorate crystal possesses one-dimensional doublestranded chain structure assembled through double hydrogen bonds and anion-π interactions, and reveals weak ferromagnetism.
Key words:  2-(Imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical  Crystallographic structure  Magnetic properties  Organic compound
FundProject:
2-(咪唑[1,2-a]吡啶-2-基)-2-氧代乙酸自由基及其高氯酸盐的晶体结构和磁性
沈忱,张一曼,雍国平*
摘要:
报道2-(咪唑[1,2-a]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-a]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.
关键词:  2-(咪唑[1,2-a]吡啶-2-基)-2-氧代乙酸自由基  晶体结构  磁性  有机化合物
DOI:10.1063/1674-0068/28/cjcp1412209
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