Ferromagnetic Dinuclear Mixed-Valence Mn(II)/Mn(III) Complexes: Building Blocks for the Higher Nuclearity Complexes. Structure, Magnetic Properties, and Density Functional Theory Calculations
摘要:
A series of six mixed-valence Mn(II)/Mn(III) dinuclear complexes were synthesized and characterized by X-ray diffraction. The reactivity of the complexes was surveyed, and structures of three additional trinuclear mixed-valence Mn(III)/Mn(II)/Mn(III) species were resolved. The magnetic properties of the complexes were studied in detail both experimentally and theoretically. All dinuclear complexes show ferromagnetic intramolecular interactions, which were justified on the basis of the electronic structures of the Mn(II) and Mn(III) ions. The large Mn(II)-O-Mn(III) bond angle and small distortion of the Mn(II) cation from the ideal square pyramidal geometry were shown to enhance the ferromagnetic interactions since these geometrical conditions seem to favor the orthogonal arrangement of the magnetic orbitals.
Ferromagnetic Dinuclear Mixed-Valence Mn(II)/Mn(III) Complexes: Building Blocks for the Higher Nuclearity Complexes. Structure, Magnetic Properties, and Density Functional Theory Calculations
摘要:
A series of six mixed-valence Mn(II)/Mn(III) dinuclear complexes were synthesized and characterized by X-ray diffraction. The reactivity of the complexes was surveyed, and structures of three additional trinuclear mixed-valence Mn(III)/Mn(II)/Mn(III) species were resolved. The magnetic properties of the complexes were studied in detail both experimentally and theoretically. All dinuclear complexes show ferromagnetic intramolecular interactions, which were justified on the basis of the electronic structures of the Mn(II) and Mn(III) ions. The large Mn(II)-O-Mn(III) bond angle and small distortion of the Mn(II) cation from the ideal square pyramidal geometry were shown to enhance the ferromagnetic interactions since these geometrical conditions seem to favor the orthogonal arrangement of the magnetic orbitals.
Two<i>C</i><sub>3</sub>-Symmetric Dy<sub>3</sub><sup>III</sup>Complexes with Triple Di-μ-methoxo-μ-phenoxo Bridges, Magnetic Ground State, and Single-Molecule Magnetic Behavior
作者:Mikko M. Hänninen、Antonio J. Mota、Daniel Aravena、Eliseo Ruiz、Reijo Sillanpää、Agustín Camón、Marco Evangelisti、Enrique Colacio
DOI:10.1002/chem.201402392
日期:2014.7.1
repulsion from the coordinating oxygen atom with the shortest DyO distance, the local magnetic moments are oriented almost perpendicular to the Dy3 plane, thus leading to a paramagnetic groundstate. CASSCF plus restricted active space state interaction (RASSI) calculations also show that the ground and first excited state of the DyIII ions are separated by approximately 150 and 177 cm−1, for Dy3⋅[BPh4]
Experimental and Computational Study of Unique Tetranuclear µ
<sub>3</sub>
‐Chloride and µ‐Phenoxo/Chloro‐Bridged Defective Dicubane Cobalt(II) Clusters
作者:Mikko. M. Hänninen、Juha Välivaara、Joan Cano、Reijo Sillanpää、Enrique Colacio
DOI:10.1002/ejic.201501190
日期:2016.3
solid-state structures of the complexes were determined by single-crystal X-ray diffraction. The cores of the cluster compounds can be defined as a two-vertex-deficient dicubane geometry (pseudo-dicubane). In the central unit, the cobalt(II) cations are linked through phenoxide oxygen (outer bridges) and chloride anions (inner bridges), previously unprecedented in this type of cobalt cluster. The magnetic
使用多齿二氨基双酚配体制备了两个四核 CoII 簇 [Co4(L)2(μ3-Cl)2Cl2]。配合物的固态结构由单晶 X 射线衍射确定。簇状化合物的核心可以定义为两个顶点缺陷的双立方几何形状(伪双立方)。在中央单元中,钴 (II) 阳离子通过苯氧氧(外桥)和氯阴离子(内桥)连接,这在此类钴簇中是前所未有的。通过实验和计算方法研究了磁性。通过组合使用技术,我们能够确定由晶体学上不同的钴 (II) 阳离子之间的不同桥接片段介导的分子内磁交换耦合的性质和强度。
Ferromagnetic Dinuclear Mixed-Valence Mn(II)/Mn(III) Complexes: Building Blocks for the Higher Nuclearity Complexes. Structure, Magnetic Properties, and Density Functional Theory Calculations
作者:Mikko M. Hänninen、Juha Välivaara、Antonio J. Mota、Enrique Colacio、Francesc Lloret、Reijo Sillanpää
DOI:10.1021/ic302731z
日期:2013.2.18
A series of six mixed-valence Mn(II)/Mn(III) dinuclear complexes were synthesized and characterized by X-ray diffraction. The reactivity of the complexes was surveyed, and structures of three additional trinuclear mixed-valence Mn(III)/Mn(II)/Mn(III) species were resolved. The magnetic properties of the complexes were studied in detail both experimentally and theoretically. All dinuclear complexes show ferromagnetic intramolecular interactions, which were justified on the basis of the electronic structures of the Mn(II) and Mn(III) ions. The large Mn(II)-O-Mn(III) bond angle and small distortion of the Mn(II) cation from the ideal square pyramidal geometry were shown to enhance the ferromagnetic interactions since these geometrical conditions seem to favor the orthogonal arrangement of the magnetic orbitals.