Bis‐μ‐pyrazolate‐Bridged Dinickel(II) and Dicopper(II) Complexes: An Example of Stereoelectronic Preference of Metal Ions and Stabilization of Mixed‐Valence Ni
<sup>III</sup>
Ni
<sup>II</sup>
Species
assembled solely via C–H···π interaction [pyridyl C–H (4-position) of pyridylpyrazole unit of L and π cloud of pyridine of bridging deprotonated L′ unit]. In 2·2MeCN, however, π···π interactions between uncoordinated pyridyl arms are observed. Variable-temperature magnetic studies on both complexes indicate the existence of strong antiferromagnetic coupling between the two metal ions (singlet-triplet
新的二聚镍 (II) 和铜 (II) 配合物 [(L)Ni(μ-L')]2[ClO4]21 和 [(L)Cu(μ-L')]2[ClO4]22, [2 -[3-(2'-吡啶基)吡唑-1-基甲基]吡啶(L)和3-(2-吡啶基)吡唑(HL')]已合成、结构表征、吸收、磁性、EPR和氧化还原属性进行了调查。1·MeCN的晶体结构揭示了一个平面的Ni2(μ-L')2}2+核[Ni…Ni分离度:4.0765(10) A],其中每个扭曲的八面体NiII离子通过三齿末端配位配体 L 并由两个 HL' 单元以去质子化形式桥接。2·2MeCN的结构分析揭示了两个五配位CuII离子,每个离子通过仅采用L的双齿配位模式进行末端配位,其中-CH2py臂保持未配位。观察到与 1·MeCN 相似的桥连 [Cu…Cu 分离:3.9382(24) A]。因此,清楚地揭示了 NiIII 和 CuII 的立体电子偏好。仔细观察
Anion−Solvent Dependence of Bistability in a Family of Meridional N-Donor-Ligand-Containing Iron(II) Spin Crossover Complexes
作者:Ben A. Leita、Suzanne M. Neville、Gregory J. Halder、Boujemaa Moubaraki、Cameron J. Kepert、Jean-François Létard、Keith S. Murray
DOI:10.1021/ic7010919
日期:2007.10.1
Five mononuclear spin crossover iron(II) bis-meridional ligand complexes of the general formula [Fe(L)(2)](X)(2).solvent, have been synthesized, where X = BF(4)- or ClO(4)-; L = 2-(1-pyridin-2-ylmethyl-1H-pyrazol-3-yl)-pyrazine (picpzpz) or 2-(3-(2-pyridyl)pyrazol-1-ylmethyl)pyridine) (picpypz); solvent = MeOH or EtOH. The magnetic and structural consequences of systematic variation of meridional ligand
Heteroaryl substituted pyrazole modulators of metabotropic glutamate receptor-5
申请人:Cosford D.P. Nicholas
公开号:US20050026963A1
公开(公告)日:2005-02-03
Pyrazole compounds substituted directly, or by a bridge, with a heteroaryl moiety containing N adjacent to the point of connection of the heteroaryl, are mGluR5 modulators useful in the treatment of psychiatric and mood disorders such as, for example, schizophrenia, anxiety, depression, bipolar disorder and panic, as well as in the treatment of pain, circadian rhythm disorders, and other diseases.
Colossal Anisotropic Thermal Expansion through Coupling Spin Crossover and Rhombus Deformation in a Hexanuclear {Fe<sup>III</sup><sub>4</sub>Fe<sup>II</sup><sub>2</sub>} Compound
作者:Hui‐Ying Sun、Yin‐Shan Meng、Liang Zhao、Nian‐Tao Yao、Pan‐Dong Mao、Qiang Liu、Fei‐Fei Yan、Hiroki Oshio、Tao Liu
DOI:10.1002/anie.202302815
日期:2023.7.10
A new hexanuclear spin crossover compound [(Tp*)FeIII(CN)3]4[FeII(Ppmp)]2⋅2 CH3OH (1) was synthesized by assembling the spin crossover FeII units and asymmetric Ppmp ligands into a rhombic core structure. It showed the colossal positive and negative anisotropic thermalexpansion coupled with spin transition.
通过将自旋交叉Fe II单元和不对称Ppmp配体组装成新的六核自旋交叉化合物[(Tp*)Fe III (CN) 3 ] 4 [Fe II (Ppmp)] 2 ⋅2 CH 3 OH ( 1 )菱形核心结构。它显示出巨大的正负各向异性热膨胀与自旋跃迁的耦合。
Javed, Saleem; Balamurugan; Jacob, Wilson, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 2011, vol. 50, # 9-10, p. 1248 - 1256