4-bromopyridine

• CAS: 1120-87-2
• Catalog Number: ACM1120872
• Category: Main Products
• Molecular Weight: 158.0
• Molecular Formula: C5H4BrN
• Appearance: Solid

Case Study

4-Bromopyridine-Induced Chirality in Magnetic Coordination Systems

Ohno, Takuro, et al. Crystal Growth & Design, 2016, 16(7), 4119-4128.

Introducing 4-bromopyridine (4-Brpy) into the self-assembled MII-[NbIV(CN)8] (M = 3d metal ion) coordination system can form three-dimensional cyanido-bridged networks. Three new cyanido-bridged networks were obtained, {[MII(4-Brpy)4]2[NbIV(CN)8]}·nH2O (M = Zn, n = 1, 1; M = Mn, n = 0.5, 2; M = Ni, n = 2, 3). It turns out that 1 is a chiral paramagnet, 3 is an achiral ferromagnet, and 2 combines both functions and is a rare example of a magnet based on chiral molecules whose chirality is induced by the non-innocent 4-Brpy ligands.
General synthetic procedure
· The synthesis of the compound {[MII(4-Brpy)4]2[NbIV(CN)8]}·nH2O involved mixing an aqueous solution of K4[NbIV(CN)8]·2H2O with a solution containing 4-bromopyridine hydrochloride, potassium hydroxide, and a chloride of a 3d metal ion (ZnIICl2, MnIICl2·4H2O, or NiIICl2·6H2O). Excess organic ligand was used to maximize yield and avoid impurities.
· The resulting polycrystalline powder was collected by suction filtration, washed with water, and air-dried before undergoing elemental analysis. Single crystals were obtained through a slow diffusion method with mixed water or water-ethanol solutions of 3d metal salt, 4-bromopyridine hydrochloride, and potassium hydroxide.
· The structural characterization of the single crystalline samples revealed two enantiomorphs, while physical measurements were performed on powder samples for further analysis using the Rietveld method.

Magneto-Optical Properties of Cyano-Bridged Bimetallic Assemblies Prepared from 4-Bromopyridine

Ohkoshi, Shin-ichi. Progress in Photon Science: Basics and Applications, 2017, 263-277.

Using 4-bromopyridine as a ligand, cyano-bridged metal assemblies {Fe2[Nb(CN)8] · (4-bromopyridine)8 · 2H2O} were prepared and their magneto-optical functions were studied. Some important magneto-optical properties include:
· This material has two types of crystal structure. One of them is plus, the other is minus. This material also exhibits spin-crossover behavior with a small Hysteresis.
· The second harmonic generation of this material was measured at room temperature. Second-harmonic intensity is not so strong, and with decreasing temperature, the intensity increased with hysteresis, and with increasing temperature second harmonic generation (SHG) intensity recovered to the original level.
· The optomagnetic properties of this material were examined and the material also exhibited optical magnetization with a Curie temperature of 15 K.
· A magnetic hysteresis loop is also observed in the magnetization versus field, and the reversible change is observed by the irradiation of two different types of light.
· This crystal is applicable not only in a binary system but also in denary or n-ary systems. For example, n-ary optical recording memory could be possible.