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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A stable organic triradical with truncated pi-conjugation as a model for single-component organic molecule-based ferrimagnetics
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A stable organic triradical with truncated pi-conjugation as a model for single-component organic molecule-based ferrimagnetics

机译：带有截短π共轭的稳定有机三基团作为基于单组分有机分子的亚铁磁的模型

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As a novel molecular design for genuinely organic molecule-based ferrimagnets, we have proposed a strategy of 'single-component ferrimagnetics.' When a pi-biradical with an S = I ground state and a pi-monoradical with S = 1/2 are united by sigma-bonds, the pi-conjugation between the biradical and the monoradical moieties should be truncated in the resultant triradical. This gives magnetic degrees of freedom for both S = I and S = 1/2 in the single molecule, serving as a building block for organic molecular ferrimagnets. We have designed and synthesized a triradical, 2,2,6,6-tetramethyl-pipelidine-1-N-oxyl-4-carboxylic acid 2,4-bis(1-oxyl-3-oxido-4,4,5,5-tetramethyl-2-imidazolin-2-yl)-phenyl ester (2) as a model compound for single-component ferrimagnetics. Solution-phase ESR spectra from 2 are explained by a perturbation treatment assuming that the exchange interaction within the biradical moiety is much larger than those between the biradical and the monoradical moieties, which is suitable for single-component ferrimagnetics. From susceptibility measurements for a cyclohexane-substituted biradical, cyclohexane carboxylic acid 2,4-bis(1-oxyl-3-oxido-4,4,5,5-tetramethyl-2-imidazolin-2-yl) phenyl ester (4) as a biradical analogue of 2, it is shown that the intramolecular ferromagnetic interaction has been found to be unaffected by the chemical modification for anchoring the monoradical moiety. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 37]
机译：作为真正基于有机分子的铁氧体的新颖分子设计，我们提出了“单组分亚铁磁”策略。当具有S = I基态的pi双自由基和具有S = 1/2的pi单自由基通过sigma键结合在一起时，应在生成的三自由基中将双自由基和单自由基部分之间的pi共轭截短。这给出了单个分子中S = I和S = 1/2的磁自由度，是有机分子亚铁的基础。我们已经设计并合成了一个三基，2,2,6,6-四甲基哌啶-1-N-氧基-4-羧酸2,4-双（1-氧基-3-氧化物-4,4,5， 5-四甲基-2-咪唑啉-2-基）-苯基酯（2）作为单组分亚铁磁的模型化合物。通过摄动处理解释了来自2的溶液相ESR光谱，假设双自由基部分内的交换相互作用比双自由基和单自由基部分之间的交换相互作用大得多，这适用于单组分亚铁磁性。通过对环己烷取代的双自由基，环己烷甲酸2,4-双（1-氧基-3-氧化-4,4,5,5-四甲基-2-咪唑啉-2-基）苯基酯（4）的敏感性测量作为2的双自由基类似物，表明已经发现分子内铁磁相互作用不受锚定单自由基部分的化学修饰的影响。 （C）2003 Elsevier ScienceLtd。保留所有权利。 [参考：37]

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