Single-Chain Magnets Constructed by Using the Strict Orthogonality of Easy-Planes: Use of Structural Flexibility to Control the Magnetic Properties was written by Kajiwara, Takashi;Tanaka, Hiroki;Nakano, Motohiro;Takaishi, Shinya;Nakazawa, Yasuhiro;Yamashita, Masahiro. And the article was included in Inorganic Chemistry in 2010.HPLC of Formula: 1620-76-4 This article mentions the following:
A family of single-chain magnets (SCMs), of which the SCM character originated from the spatial arrangement of high spin FeII ions with easy-plane anisotropy, was synthesized, and their magnetic properties were studied. The chain complexes including alternating high-spin FeII ions and low-spin FeIII ions, catena-[FeII(ClO4)2{FeIII(bpca)2}]-ClO4·3MeNO2 (1·3MeNO2), catena-[FeII(ClO4)(H2O){FeIII(MeL)2}](ClO4)2·2MeNO2·H2O (2·2MeNO2·H2O), catena-[FeII(ClO4)(H2O){FeIII(BuL)2}](ClO4)2·3.5MeNO2 (3·3.5MeNO2), and catena-[{FeII(ClO4)(H2O)FeII(H2O)2}0.5{FeIII(PhL)2}](ClO4)2.5·4EtNO2(4·4EtNO2), were synthesized using bridging ligand Hbpca (bis-(2-pyridylcarbonyl)amine) and its derivatives of HMeL, HBuL, and HPhL each incorporating Me, tert-Bu, or Ph group on the 4-position of pyridyl ring. These complexes showed a typical ferromagnetic behavior on d.c. susceptibility data, and from an a.c. susceptibility measurements, SCM or superparamagnetic behaviors were confirmed with the Δ/kB values of 22.5(4), 21.8(18), and 28.8(3) K for 1·3MeNO2, 2·2MeNO2·H2O, and 3·3.5MeNO2, of which the easy-axis anisotropy was originated from the orthogonal arrangement of easy-planes of FeII ions. In the crystal structures, cylindrical voids were formed along the chain axis being surrounded by four chains in 1·3MeNO2, 2·2MeNO2·H2O, and 4·4EtNO2 and two chains in 3·3.5MeNO2, and solvent mols. as well as coordination-free perchlorate anions occupied these voids in a slightly different fashion depending on the complexes. 2·2MeNO2·H2O maintains its chem. composition in a dried condition, whereas 1·3MeNO2, 3·3.5MeNO2, and 4·4EtNO2 easily release solvent mols. to give 1, 3, and 4, resp. 1 And 3 maintain the crystalline character showing slightly different XRD patterns from those of 1·3MeNO2 and 3·3.5MeNO2, and an enhancement of SCM character after release of the solvent mols. was observed for both. 4 Lost crystalline character to become amorphous, and it lost the SCM character at the same time. In the experiment, the researchers used many compounds, for example, 4-Methylpicolinonitrile (cas: 1620-76-4HPLC of Formula: 1620-76-4).
4-Methylpicolinonitrile (cas: 1620-76-4) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.HPLC of Formula: 1620-76-4