Crystal Structure and Magnetic Property Studies of a Novel Hybrid Compound (C6H16N2) CoCl4

Abstract

1-(2Aminoethyl) pyrrolidinium tetrachlorocobaltat (C6H16N2) CoCl4 has been prepared and analyzed by X-ray diffraction. The compound crystallizes in the orthorhombic system with space group P212121. The unit cell dimensions are a= 7.3279(13), b= 13.051(2) and c= 13.831(2) Å with Z= 4. The crystal structure of this salt was solved by Patterson methods and refined by full-matrix least squares on F 2 to the final values of R=0.0486 and wR =0.1347. The structure consists of diprotonated 1-(2aminoethyl) pyrrolidinium cations and monomeric CoCl $_{4}^{2-}$ These entities are interconnected by means of hydrogen bonding contacts forming a threedimensional network. Magnetization was used to investigate the magnetic properties. This compound exhibits an antiferromagnetic (AFM) to paramagnetic (PM) phase transition at a temperature (T N) lower than 2 K. The values of paramagnetic Curie–Weiss temperature (𝜃 cw) and the exchange parameter (J/ K B) emphasize the existence of an antiferromagnetic interaction between the neighboring cobaltions.