在含有伊米达的辅助连接体的二烯复合体中的价值同体
Anderson Moledo Vicente Guedes1, Leandro Sodré de Abreu1, Igor Antunes Vogel Maldonado1
1Instituto de Química, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-909 Brazil giordano.poneti@unitus.it.
RSC advances
|July 6, 2023
概括
合成了两种新型的复合物,其中有一种意达联体. 一个综合体展示了一个由驱动的瓦伦斯陶托马力过程,为新的温度可切换的分子磁性材料铺平了道路.
科学领域:
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
- 磁电化学 磁电化学 磁电化学
背景情况:
- 价值陶托美化 (VT) 是一种现象,其中一个分子在电子分布和自旋状态上发生可逆变化.
- 辅助连接体在调整金属复合物的特性,包括它们的VT行为方面发挥着至关重要的作用.
- 开发新的配体对于扩大具有可切换性质的分子材料库至关重要.
研究的目的:
- 为了合成和描述两种新型的复合物,其中包括一个imidazolic tetradentate辅助连接体,bmimapy.
- 研究这些复合物的结构,光谱和磁性特性.
- 探索这些复杂物作为温度可切换的分子磁性材料的潜力.
主要方法:
- 单晶X射线衍射用于结构阐明.
- 磁力测量用于研究磁性属性和取决于温度的行为.
- 循环电压测量和DFT分析,以了解瓦伦斯陶托米过程和自由能量变化.
主要成果:
- 合成了两个伪八面体的复合物,即[Co(bmimapy) ((3,5-DTBCat) ]PF6·H2O (1) 和[Co(bmimapy) ((TCCat) ]PF6·H2O (2),并进行了结构性特征.
- 综合体1显示了一个由驱动的,在300-380 K之间不完整的Valence Tautomeric过程.
- 复合体2显示了一个温度独立的,二磁性低旋转 (III) -catecholate状态,估计VT的自由能量差异为复合体1的+8kJmol-1和复合体2的+96kJmol-1.
结论:
- 伊米达的bmimapy配体已成功引入,证明了其在促进瓦伦斯陶托梅里斯 (Valence Tautomerism) 的有用性.
- bmimapy 的甲基-意米达悬挂臂在有利于静脉瘤现象方面发挥着作用.
- 这项工作扩大了辅助连接体的范围,用于创建可切换温度的新型分子磁性材料.
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