Crystal Structures and Magnetic Properties of Complexes of MIICl2 (M = Cu, Ni, and Co) Coordinated with 4-(N-tert-butyloxyamino)-2-(methoxymethylenyl)pyridine: 2D Magnetic Anisotropy of the Aminoxyl-CoII Complex in the Crystalline State was written by Zhu, Zhicheng;Karasawa, Satoru;Koga, Noboru. And the article was included in Inorganic Chemistry in 2005.Application of 131747-45-0 This article mentions the following:
Three metal complexes, [MIICl2(4NOPy-OMe)2] (M = Cu (1), Ni (2), and Co (3)), were prepared by mixing the corresponding metal chloride and aminoxyl radical 4-(N-tert-butyloxyamino)-2-(methoxymethylenyl)pyridine, 4NOPy-OMe, in 1:2 ratio. Complex 1 has two structures (complexes A and B) with similar coordination geometries, compressed octahedrons. In the crystal structure, complexes A and B locate alternately in short distances (Cradical··· Cβ = 3.17 and 3.23 Å) to form a 1-dimensional chain structure. Complexes 2 and 3 are isomorphous and have a slightly distorted octahedral structure. In the crystal structure, both complexes have intermol. short contacts (Cradical···Cα = 3.46 and 3.52 Å for 2 and 3, resp.) to form the 2-dimensional structures. The temperature dependence of the χmolT values for the three complexes indicated that the magnetic interactions between the radicals and the metal ions within the complexes were ferromagnetic. By fitting a modified Fisher 1-dimensional model to the data of the χmolT vs. T plot for 1, the authors estimated the intra- and intermol. (intrachain) exchange coupling constants to be J1/kB = 60.2 and J2/kB = -7.02 K, resp. However, complexes 2 and 3 showed steep increases of the χmolT value below ca. 3 K, indicating that the long-range magnetic ordering is operating. The 1/χmol vs. T plot for 2 was analyzed by a Curie-Weiss model to give θ = 6.25 K and C = 2.02 cm3 K mol-1 with gNi = 2.25. Complex 3 was studied in more detail using an oriented sample. Magnetic behavior strongly depends on the direction of the applied field, in which the c* axis perpendicular to the ab plane is an easy axis for magnetization. D.c. and a.c. magnetic susceptibility measurements revealed that complex 3 had a magnetic phase transition of Tc = 2.14 K and exhibited a glass-like magnetic behavior below Tc. In the experiment, the researchers used many compounds, for example, (4-Bromopyridin-2-yl)methanol (cas: 131747-45-0Application of 131747-45-0).
(4-Bromopyridin-2-yl)methanol (cas: 131747-45-0) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Application of 131747-45-0