title: 3-Chloro-6-[2-(cyclo-pentyl-idene)hydrazin-1-yl]pyridazine.
abstract: The asymmetric unit of the title compound, C(9)H(11)ClN(4), contains two virtually planar mol-ecules that differ in conformation about the bond connecting the hydrazine and pyridazine units. The 3-chloro-6-hydrazinylpyridazine and cyclo-pentane groups are oriented at dihedral angles of 4.5 (3) and 8.8 (4)° in the two mol-ecules. In the crystal, the mol-ecules form a one dimensional polymeric structure extending along the a axis via N-H⋯N hydrogen bonds. The crystal stucired was an inversion twin [ratio of the twin domains = 0.73 (9):0.27 (9)].
authors.forename: Abdul Qayyum
authors.initials: AQ
authors.lastname: Ather
authors.forename: M Nawaz
authors.initials: MN
authors.lastname: Tahir
authors.forename: Misbahul Ain
authors.initials: MA
authors.lastname: Khan
authors.forename: Muhammad Makshoof
authors.initials: MM
authors.lastname: Athar