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首页> 外文期刊>RSC Advances >Synthesis and characterization of the physicochemical and magnetic properties for perfluoroalkyl ester and Fe(iii) carboxylate-based hydrophobic magnetic ionic liquids
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Synthesis and characterization of the physicochemical and magnetic properties for perfluoroalkyl ester and Fe(iii) carboxylate-based hydrophobic magnetic ionic liquids

机译：全氟烷基酯与Fe（III）羧酸盐基疏水性磁离子液体的物理化学和磁性性能的合成与表征

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Magnetic ionic liquids (MILs) are a new class of ionic liquids (ILs) that incorporate a paramagnetic component in their chemical structure. Although imidazolium-based MILs can be synthesized using inexpensive and relatively straightforward procedures, these compounds often are water soluble which limits their usefulness in aqueous applications. In this study, two classes of hydrophobic MILs, including perfluorobutyryl ester-based and Fe( III ) carboxylate-based MILs, were synthesized and characterized. Functionalization of the cation with fluorinated substituents yielded MILs that were insoluble in aqueous solution at concentrations as low as 0.1% (w/v). In contrast to conventional MILs that rely on paramagnetic anions, Fe( III ) carboxylate-based MILs were prepared featuring carboxylate ligands in the cationic moiety capable of chelating a paramagnetic Fe( III ) center. The hydrophobic character of the Fe( III ) carboxylate-based MILs was subsequently controlled by incorporating the bis[(trifluoromethyl)sulfonyl]imide ([NTf _(2) ~(?) ]) anion, resulting in MILs that were insoluble in aqueous solutions at 0.1% (w/v). This synthetic strategy has the potential to impart dual functionality to MILs by providing the flexibility to incorporate a task specific anion without sacrificing paramagnetic properties. The molar magnetic susceptibilities ( χ _(m) ) and effective magnetic moments ( μ _(eff) ) of the studied MILs were determined using superconducting quantum interference device (SQUID) magnetometry. Consistent with the Curie–Weiss law, a linear relationship between temperature and inverse magnetic susceptibility ( χ _(m) ~(?1) ) was observed for the hydrophobic MILs. The μ _(eff) values of the MILs examined in this study ranged from 3.56 to 8.06 Bohr magnetons ( μ _(B) ).
机译：磁离子液体（MIL）是一种新的离子液体（ILS），其在其化学结构中掺入了顺磁性组分。尽管基于Imidazolium的米尔可以使用廉价且相对简单的程序合成，但这些化合物通常是水溶性，其限制了它们在水性应用中的有用性。在该研究中，合成并表征了两种类别的疏水性米尔，包括全氟丁基酯基和基于Fe（III）羧酸烯酯的米尔。用氟化取代基的阳离子的官能化产生米尔，其在浓度下不溶于0.1％（w / v）。与依赖顺磁体阴离子的常规米尔相比，制备Fe（III）羧酸盐的密耳，其具有阳离子部分中的羧酸盐配体，其能够螯合顺磁体Fe（III）中心。随后通过掺入双[（三氟甲基）磺酰基]酰亚胺（[NTF _（2）〜（α）]阴离子，得到含Fe（III）羧酸盐的米尔的疏水性特征，导致米尔不溶于水性溶液0.1％（w / v）。这种合成策略通过提供在不牺牲顺磁性特性的情况下通过提供特异性阴离子的灵活性来赋予米尔的双重功能。使用超导量子干涉装置（鱿鱼）磁度测定确定所研究的密耳的摩尔磁性敏感性（χ_（m））和有效磁矩（μ_（eff））。与Curie-Weiss Lave一致，对于疏水性密耳，观察到温度和逆磁性敏感性之间的线性关系（χ_（m）〜（α1））。本研究中检查的MIL的μ_（EFF）值范围从3.56到8.06 BoHR磁电流（μ_（b））。

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