Synthesis and Characterization of Chromium-Isothiocyanate-4-Methylpyridine Complexes
The synthesis and single crystal X-ray structure of trans-[HNC6H7][Cr(NCS)4(NC6H7)2] (1) and mer-[Cr(NCS)3(NC6H7)3] (2) are reported. Compound 1 was synthesized by refluxing chromium powder and thiourea in 4-methylpyridine. The isothiocyanate ligand is believed to be generated from the isomerization of thiourea to ammonium thiocyanate during synthesis. Compound 2 was prepared from CrCl3 and KSCN in 4-methylpyridine. The reaction conditions for both compounds yielded a mixture of [Cr(NCS)x(NC6H7)6−x]3−x isomers (x = 0–6), which were analyzed by HPLC. The thermal properties of trans-[HNC6H7][Cr(NCS)4(NC6H7)2] were analyzed by thermogravimetric analysis/differential scanning calorimetry–mass spectroscopy (TGA/DSC–MS), and the compound was found to oxidize to CrO2 in three major weight loss steps when heated to 1000 °C in dry air.
Young, Jennifer L.; Harris, Jerry D.; Benjamin, Joshua A.; Fitch, Jannah E.; Nogales, Daniel F.; Walker, Joanna R.; Frost, Brian J.; Thurber, Aaron; and Punnoose, Alex. (2011). "Synthesis and Characterization of Chromium-Isothiocyanate-4-Methylpyridine Complexes". Inorganica Chimica Acta, 377(1), 14-19.