Unusual complexation of 1-phenylthiocarbamoyl-3-(pyridin-2-yl)pyrazoline with copper(ii) chloride

Complexation of 5-(4-dimethylaminophenyl)-1-phenylthiocarbamoyl-3-(pyridin-2-yl)-4,5-dihydro-1H-pyrazole with CuCl₂ followed by recrystallization from alcohols as external nucleophiles affords the products of pyrazoline ring opening by thiosemicarbazone moiety. The structure of the obtained complex was confirmed by X-ray diffraction data.