Chirality‐ and pH‐Controlled Supramolecular Isomerism in Cobalt Phosphonates and Its Impact on the Magnetic Behavior |
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| Authors: | Jian‐Shen Feng Dr Song‐Song Bao Dr Min Ren Zhong‐Sheng Cai Prof?Dr Li‐Min Zheng |
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| Institution: | 1. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (P. R. China);2. School of Chemistry and Pharmaceutical Engineering, Sichuan University of Science & Engineering, Zigong 643000 (P. R. China) |
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| Abstract: | Two pairs of enantiomeric compounds with formulas (S)‐ or (R)‐Co3(ppap)2(4,4′‐bpy)2(H2O)2 ? 4 H2O (S)‐ 1 or (R)‐ 1 ], (S)‐ or (R)‐Co3(ppap)2(4,4′‐bpy)2(H2O)2 ? 3 H2O (S)‐ or (R)‐ 2 ), and related racemic compound Co3(ppap)2(4,4′‐bpy)2(H2O)2 ? 4 H2O (rac‐ 3 ; 4,4′‐bpy=4,4′‐bipyridine, H3ppap=3‐phenyl‐2‐(phosphonomethyl)amino]propanoic acid) are reported. Compounds 1 and rac‐ 3 show identical three‐dimensional framework structures, whereas compounds 2 have two‐dimensional layer structures. Compounds 1 and 2 are catenation isomers, formation of which is controlled solely by the pH of the reaction mixtures, whereas the formation of isomeric compounds 1 and rac‐ 3 is controlled purely by the chirality of the phosphonate ligand. The magnetic properties of fully dehydrated (S)‐ 1 , (S)‐ 2 , and rac‐ 3 are highly dependent on both structure and chirality. |
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| Keywords: | chirality cobalt isomers magnetic properties N O ligands |
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