Wikaira, Jan L. published the artcileTetrahalocuprate salts of substituted 4-aminopyridines: Synthesis, structure and magnetic properties, Related Products of pyridine-derivatives, the publication is Polyhedron (2013), 770-780, database is CAplus.
The reaction of CuX2 (X = Br or Cl) with 4-amino-2-chloropyridine or 4-amino-2-methylpyridine in aqueous acids (HX; X = Br or Cl) yields bis(4-amino-2-chloropyridinium) tetrachlorocuprate(II) 3, bis(4-amino-2-chloropyridinium) tetrabromocuprate(II) 4, bis(4-amino-2-methylpyridinium) tetrachlorocuprate(II) monohydrate 5, and bis(4-amino-2-methylpyridinium) tetrabromocuprate(II) monohydrate 6. These compounds were characterized by IR, powder x-ray diffraction, single crystal X-ray diffraction, combustion anal., and temperature dependent magnetic susceptibility. Compounds 3 and 4 both crystallize in the monoclinic space group C2/c, compounds 5 crystallizes in the monoclinic space group P21/c and compound 3 crystallizes in the triclinic space group P-1. Magnetic data were collected for the four synthesized compounds and their previously reported parent compounds of 4-aminopyridinium tetrachlorocuprate 1, or tetrabromocuprate 2. All compounds exhibit antiferromagnetic exchange via the two-halide exchange, with strongest exchange observed for compound 6. A number of potential magnetic exchange pathways are seen in these compounds, but fitting of the data to available anal. models suggests that the magnetic exchange constants are 2J/kB approx. -0.14(2) K in 1, â?0.812(5) K in 2, â?0.173(6) K in 3, â?0.82(1) K in 4, â?2.123(6) K in 5, and â?30.9(1) K in 6.
Polyhedron published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C4Br2N2O4S, Related Products of pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem