单分子磁体聚合物凝胶的合成及其性质研究
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摘要
以丁二酸酐(SA)修饰的聚氧乙烯(PEO)作为配体(PEO-SA),与经典的单分子磁体络合制备出有机凝胶。通过核磁共振(NMR)、超导量子干涉仪(SQUID)等测试结果来推测单分子磁体在聚合物凝胶中的存在形式,并对其相关性质进行了表征。结果表明,分子量为4 000的修饰聚乙二醇(PEO)与Mn_(12)以配位交联的形式,在异丙醇中形成4k-PEO-SA-Mn12有机凝胶。
Single-molecular-magnets polymer gels was prepared with butanedioic anhydride modified polyoxyethylene( PEO) chain and the classical single molecular magnets( SMMs) of [Mn12 O12( O2 CCR)16( H2 O)4]( Mn12). The structure of the SMMs polymer gels were characterized by nuclear magnetic resonance spectroscopy( NMR). Possible structure model of the SMMs polymer gels was then suggested. The magnetic property of SMMs polymer gels was studied by superconducting quantum interference device( SQUID). The results show that the modified PEO with molecular weight of 4 000 is formed in the form of ligand cross-linking and 4 k-PEO-SA-Mn12 organic gel is formed in isopropyl alcohol.
Single-molecular-magnets polymer gels was prepared with butanedioic anhydride modified polyoxyethylene( PEO) chain and the classical single molecular magnets( SMMs) of [Mn12 O12( O2 CCR)16( H2 O)4]( Mn12). The structure of the SMMs polymer gels were characterized by nuclear magnetic resonance spectroscopy( NMR). Possible structure model of the SMMs polymer gels was then suggested. The magnetic property of SMMs polymer gels was studied by superconducting quantum interference device( SQUID). The results show that the modified PEO with molecular weight of 4 000 is formed in the form of ligand cross-linking and 4 k-PEO-SA-Mn12 organic gel is formed in isopropyl alcohol.
引文
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[3]FRIEDMAN J R,SARACHIK M P,TEJADA J,et al.Macroscopic measurement of resonant magnetization tunneling in high-spin molecules[J].Phys Rev Lett,1996,76(20):3830.
[4]CHAKOV N E,SOLER M,WERNSDORFER W,et al.Single-molecule magnets:Structural characterization,magnetic properties,and(19)F NMR spectroscopy of a Mn(12)family spanning three oxidation levels[J].Inorganic Chem,2005,44(15):5304-21.
[5]CHRONOPOULOU L,LORENZONI S,MASCI G,et al.Lipase-supported synthesis of peptidic hydrogels[J].Soft Matter,2010,6(11):2525-2532.
[6]ZHUKHOVITSKIY A V,ZHAO J,ZHONG M,et al.Polymer structure dependent hierarchy in poly MOC gels[J].Macromolecules,2016,49(18):1723-1726.
[7]KLUGER R.Click chemistry for biotechnology and materials science[M].Hoboken:Wiley&Sons,2009:291-307.
[8]LIS T.Preparation,structure,and magnetic properties of a dodecanuclear mixed-valence manganese carboxylate[J].Acta Crystallographica,1980,36(9):2042-2046.
[9]CHAKOV N E,WERNSDORFER W,ABBOUD K A,et al.Single-molecule magnets.A Mn12complex with mixed carboxylate-sulfonate ligation[J].Dalton Transactions,2003,11(11):2243-2248.