Synthesis and Characterization of Chromium-Isothiocyanate-4-Methylpyridine Complexes

Jennifer L. Young, Jerry D. Harris, Joshua A. Benjamin, Jannah E. Fitch, Daniel F. Nogales, Joanna R. Walker, Brian J. Frost, Aaron Thurber, Alex Punnoose

Research output: Contribution to journalArticlepeer-review

Abstract

The synthesis and single crystal X-ray structure of trans -[HNC 6 H 7 ][Cr(NCS) 4 (NC 6 H 7 ) 2 ] ( 1 ) and mer -[Cr(NCS) 3 (NC 6 H 7 ) 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 CrCl 3 and KSCN in 4-methylpyridine. The reaction conditions for both compounds yielded a mixture of [Cr(NCS) x (NC 6 H 7 ) 6− x ] 3− x isomers ( x = 0–6), which were analyzed by HPLC. The thermal properties of trans -[HNC 6 H 7 ][Cr(NCS) 4 (NC 6 H 7 ) 2 ] were analyzed by thermogravimetric analysis/differential scanning calorimetry–mass spectroscopy (TGA/DSC–MS), and the compound was found to oxidize to CrO 2 in three major weight loss steps when heated to 1000 °C in dry air.

Original languageAmerican English
JournalPhysics Faculty Publications and Presentations
StatePublished - 1 Nov 2011

Keywords

  • chromium
  • crystal structure
  • isothiocyanate
  • methylpyridine
  • thermal analysis

EGS Disciplines

  • Physics

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