《Structural Variety in Mn(NCS)2 4-Cyanopyridine Coordination Compounds: Synthesis, Structures, Isomerism, and Magnetic Properties》 was written by Wellm, Carsten; Neumann, Tristan; Gallo, Gianpiero; Dziubyna, Anna M.; Rams, Michal; Dinnebier, Robert E.; Naether, Christian. Quality Control of 4-Cyanopyridine And the article was included in Crystal Growth & Design in 2020. The article conveys some information:
The reaction of Mn(NCS)2 with 4-cyanopyridine (CNpy) gives discrete complexes [Mn(NCS)2(CNpy)4] (1), [Mn(NCS)2(H2O)2(CNpy)2] (2-I and 2-II), and [Mn(NCS)2(H2O)2(CNpy)2]·xCNpy (x = 4, 3; x = 2, 4), in which the Mn(II) centers are octahedrally coordinated by two terminal N-bonded thiocyanate anions and by four (1) or two CNpy coligands and two H2O mols. (2-I, 2-II, 3, and 4). If an excess of Mn(NCS)2 was used, [Mn(NCS)2(CNpy)2]n (5) and [Mn(NCS)2(CNpy)]n (6-I and 6-II) were obtained. In all compounds the Mn(II) cations are octahedrally coordinated and linked into linear chains (5), into layers (6-I), or into a 3-dimensional network (6-II) by the thiocyanate anions. Studies using TG-DTA and temperature-dependent powder x-ray diffraction prove that the discrete complexes 2-II, 3, and 4 decompose in several steps, giving Mn(NCS)2 via 5 and 6-I as intermediates. For compounds 2-II, 4, and 6-II only one batch was obtained, indicating that these compounds are metastable. Magnetic measurements for 5 and 6-I reveal dominating antiferromagnetic interactions and susceptibility curve maxima at 20 K (5) and 24 K (6-I), reproduced by quantum Monte Carlo simulations. The sp. heat proves magnetic ordering at 2.8 K (5) and 12.4 K (6-I). The ordering of 6-I is associated with a weak ferromagnetism. Several Mn(NCS)2 4-cyanopyridine coordination compounds including polymorphic and isomeric modifications were synthesized and structurally characterized by SC-XRD and PXRD. Their thermal reactivity and magnetic behavior were studied. After reading the article, we found that the author used 4-Cyanopyridine(cas: 100-48-1Quality Control of 4-Cyanopyridine)
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.Quality Control of 4-Cyanopyridine