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| Synthesis and Gelation Ability of Spin-Crossover Iron(Ⅱ) Alkyl Imidazole Complexes |
| Author Name | Affiliation | E-mail | | WANG Ya-Qin | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | ZHANG Hai-Xia | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | ZHANG Shu-Heng | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | HE Wei | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | GE Fang-Yuan | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | CHEN Yu-Xin | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China | | | GU Zhi-Guo | School of Chemistry and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Wuxi, Jiangsu 214122, China | zhiguogu@jiangnan.edu.cn |
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| Abstract: Complexes 1~5 were synthesized by one-step reaction of 1-heptyl-1H-imidazole-2-carboxaldehyde(L1), 1-tetradecyl-1H-imidazole-2-carbaldehyde(L2), 1-hexadecyl-1H-imidazole-2-carbaldehyde(L3), 1-octadecyl-1H-imidazole-2-carboxaldehyde(L4), 1-eicosyl-1H-imidazole-2-carboxaldehyde(L5) with ferrous tetrafluoroborate and 1-phenylethylamine, respectively. The five complexes have been determined by IR spectra and elemental analysis. X-ray crystallography reveals that each unit in 1 contains one[Fe(L1)3]2+ cation and two BF4- anions. The iron(Ⅱ) center coordinates with six N donor atoms from three ligands to form a octahedral mononuclear compound with fac-configuration. The Fe(Ⅱ)-N bond distances indicate that the Fe(Ⅱ) sites of 1 are in low-spin state. As for[Fe(L1)3]2+, intramolecular π-π interactions are present between phenyl group and imidazole ring of an adjacent ligand, and then a supramolecular architectures are further formed by C-H…π interactions between alkyl chain and aromatic ring. Magnetic measurements reveal that 1 displays incomplete spin-crossover behaviour at 341 K, and 2 is a high-spin paramagnetic compound, while 3~5 show incomplete spin-crossover behaviour. The corresponding metallogels MOG2~MOG5 were formed by using complexes 2~5 with longer alkyl chains as gelator and cyclohexane as solvent. Scanning electron microscopy(SEM) images showed that the MOG2~MOG5 had 3D network pore structure. Reversible gel-sol transitions were found in MOG2~MOG5. Under the influence of heat and mechanical force, MOG2~MOG5 were rapidly converted to sol, which can be restored to gel after being stationary, showing good stimulation-response and self-healing ability. |
| Keywords: Fe(Ⅱ) complexes spin-crossover metallogels stimulus responsiveness |
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| WANG Ya-Qin,ZHANG Hai-Xia,ZHANG Shu-Heng,HE Wei,GE Fang-Yuan,CHEN Yu-Xin,GU Zhi-Guo.Synthesis and Gelation Ability of Spin-Crossover Iron(Ⅱ) Alkyl Imidazole Complexes[J].Chinese Journal of Inorganic Chemistry,2019,35(12):2260-2268. |
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