The author of 《Mechanochemistry, an Easy Technique to Boost the Synthesis of CuI Pyrazine Coordination Polymers》 were Cappuccino, Chiara; Farinella, Francesco; Braga, Dario; Maini, Lucia. And the article was published in Crystal Growth & Design in 2019. SDS of cas: 100-48-1 The author mentioned the following in the article:
Depending on the exptl. conditions, the solid-state reactions of CuI with pyrazine (pyz) yield three distinct coordination polymers (CPs): a double chain polymer [Cu2I2(pyz)]n (yellow powder) and a single strand [CuI(pyz)]n (red powder) and its new isomeric compound [(CuI)2(pyz)2]n (orange powder), which present dimers of CuI bridged by the pyrazine ligands. The conversions among the three CPs were studied: by heating to 110°, [CuI(pyz)]n or [(CuI)2(pyz)2]n convert into [Cu2I2(pyz)]n, which reverts to the starting compounds upon kneading or grinding in the presence of pyrazine. The orange isomer [(CuI)2(pyz)2]n is obtained only when the solid-state reaction is performed with neat grinding or by direct melting of the pyrazine; it is unstable in the presence of solvent or vapor, and it readily transforms into the red isomer. The structure of [(CuI)2(pyz)2]n was determined by x-ray powder diffraction. [Cu2I2(pyz)]n reacts also with 4-cyanopyrazine to yield the mixed ligand compound [(CuI)(4CN-py)2 py]n, which, when heated, decomposes into [Cu2I2(pyz)]n and [(CuI)4(4CN-py)5]n. In the experiment, the researchers used 4-Cyanopyridine(cas: 100-48-1SDS of cas: 100-48-1)
4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.SDS of cas: 100-48-1