One-dimensional metal phosphonates based on 6-phosphononicotinic acid:A structural and magnetic study  

作　　者：WANG PengFei, DUAN Yan & ZHENG LiMin State Key Laboratory of Coordination Chemistry Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China 

出　　处：《Science China Chemistry》2010年第10期2112-2117,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (90922006);Natural Science Foundation of Jiangsu Province (BK2009009);NSFC for Creative Research Group (20721002)

摘　　要：The reactions of 6-phosphononicotinic acid (pnaH3) and metal salts result in three new compounds, namely, M(pnaH)-(H2O)3·H2O [M = Co(Ⅱ) (1), Ni(Ⅱ) (2), Zn(Ⅱ) (3)]. These compounds are isostructural and contain 21 helical chains made up of corner-sharing {MO5N} octahedra and {PO3C} tetrahedra. The chains are further connected by extensive hydrogen bonds to form a three-dimensional supramolecular structure. Magnetic studies reveal that dominant antiferromagnetic interactions are mediated in both 1 and 2. Interestingly the dehydrated compound 1 shows metamagnetic behavior at low temperature.The reactions of 6-phosphononicotinic acid (pnaH3) and metal salts result in three new compounds, namely, M(pnaH)-(H2O)3·H2O [M = Co(Ⅱ) (1), Ni(Ⅱ) (2), Zn(Ⅱ) (3)]. These compounds are isostructural and contain 21 helical chains made up of corner-sharing {MO5N} octahedra and {PO3C} tetrahedra. The chains are further connected by extensive hydrogen bonds to form a three-dimensional supramolecular structure. Magnetic studies reveal that dominant antiferromagnetic interactions are mediated in both 1 and 2. Interestingly the dehydrated compound 1 shows metamagnetic behavior at low temperature.

关 键 词：carboxylate-phosphonate coordination polymer magnetic property METAMAGNETISM 

分 类 号：O641.4[理学—物理化学]