Dichlorido[2-(3,5-dimethyl-1H-pyrazol-1-yl-κN²)ethanamine-κN]zinc(II)

Abstract

The amine title complex, [ZnCl2(C7H13N3)], resulted from imine hydrolysis in a Schiff base compound. The Zn metal atom has a distorted tetra­hedral geometry with the most significant deviation identified in the magnitude of the N—Zn—N angle. This deviation stems from the participation of the Zn and N atoms in a six-membered metallocyclic ring. The latter is in an approximate screw-boat conformation. Two strong N—H⋯Cl hydrogen bonds link the mol­ecules into ribbons propagating along the b-axis direction. The ribbons contain two second-order hydrogen-bonded motifs: a chain and a ring. The chain described by the graph set notation C 2 2(6) is formed by one hydrogen bond going in the forward direction (donor to acceptor) and the other in the backward direction (acceptor to donor). In the ring motif R 2 2(8), both hydrogen bonds propagate in the forward direction.

{1,2-Bis[(3,5-dimethyl-1H-pyrazol-1-yl-κN2)methyl]benzene}dichloridozinc(II)

“…The distortion in (I) is noticeably smaller than in relevant compounds in the Cambridge Structural Database (Allen, 2002;Guzei et al 2011). A structural check of (I) in Mogul confirmed its other geometrical parameters to be typical (Bruno et al 2002).…”

“…For the cobalt and copper analogues, see: Chang et al (1994). Discussion of the effect of the size of metallocyclic rings on the distortion of tetrahedral dipyrazole dizinc complexes can be found in Guzei et al (2011). Related structures were found in the Cambridge Structural Database (Allen, 2002).…”

“…In the title complex (I) the bis-pyrazolyl ligand binds to the zinc center to form a nine-membered metallocycle. The dependence of the magnitude of the N-Zn-N angle on the size of the metallocycle was discussed by Guzei et al (2011) for 2-(3,5-dimethyl-pyrazol-1-yl)-ethylamine zinc(II) chloride (II). In (I) the N-Zn-N angle (111.72 (4)°) is much closer to the ideal tetrahedral value because the size of the ring (nine atoms) exceeds 6, whereas in (II) the metallocycle is six-membered and more sterically constrained, which leads to a smaller angle of 96.88 6 7,141 (7), 95.01 (13)-100.68 (12)°.…”