Solid polymorphism and dynamic magnetic properties of a dodecylated vanadyl-porphyrinato complex: spin-lattice relaxations modulated by phase stabilisation
Solid polymorphism and dynamic magnetic properties of a dodecylated vanadyl-porphyrinato complex: spin-lattice relaxations modulated by phase stabilisation
复制标题
十二烷基化氧钒-卟啉配合物的固体多态性和动态磁特性：相稳定调制的自旋晶格弛豫
DOI：
10.1039/d2qi01607a
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发表时间：
2022
影响因子：
7
通讯作者：
Yamashita Masahiro
中科院分区：
文献类型：
--
作者：
Horii Yoji;Makino Momo;Yamamoto Taro;Tatsumi Shoichi;Suzuki Hal;Noguchi Mariko;Yoshida Takefumi;Kajiwara Takashi;Li Zhao-Yang;Yamashita Masahiro
金属配合物的动态磁行为与其声子模式相关，而声子模式依赖于固体的多晶型。然而，没有系统的研究揭示了固相和自旋晶格弛豫之间的相关性。在此，我们报告了含有十二烷基链的VO 2 +-卟啉配合物的磁性（1）。由于分子结构的灵活性，我们成功地分离出亚稳晶相1 m，玻璃相1g和稳定晶相1 s。虽然三相的化学组成相同，但具有最低熵的1 s表现出最长的磁弛豫时间。结果表明：（1）相稳定化是延长自旋-晶格弛豫时间的有效方法;（2）自旋-晶格弛豫与固体的熵有关。
The dynamic magnetic behavior of metal complexes correlates with their phonon modes, which depend on solid polymorphs. However, no systematic study has revealed the correlation between solid phases and spin–lattice relaxation. Herein, we report the magnetism of a VO2+–porphyrinato complex that contains dodecyl chains (1). Owing to the flexibility of the molecular structure, we successfully isolated the metastable crystalline phase 1m, the glass phase 1g and the stable crystalline phase 1s. Although the chemical compositions of the three phases are the same, 1s with the lowest entropy exhibited the longest magnetic relaxation time. Our results suggest that (1) phase stabilization is an effective method for elongating the spin–lattice relaxation time and (2) spin–lattice relaxation correlates with the entropy of the solid.