Crystal structure of bis(1-pyridin-2-yl-ethylidene)-p-tolylamine)nickel dithiocyanat, [Ni(C₁₄H₁₄N₂)₂](NCS)₂

Abstract

Source of material 1-Pyridin-2-yl-ethanone (0.1 . mmol, 12.1 . mg), NH 4 SCN (0.1 . mmol, 7.6 mg), Ni(CH 3 COO) 2 (0.1 mmol, 17.7 mg) and ptolylamine (0.1 mmol, 10.7 mg) were dissolved in methanol (10 .ml). The mixture was stirred for 30 min at room temperature to give aclear brown solution. After keeping this solution in air for 7d,brown block-shaped crystals of the title compound were obtained on slow evaporation of the solvent. The crystals were collected, washed with methanol and dried in avacuum desiccator using anhydrous CaCl 2 (yield 54 %). DiscussionSchiff base complexes have been extensively investigated. Up to now it is still ah ot research field, which could be attributed to their strong coordination ability and versatile coordination modes, antiseptic and antitumor activities [1,2] together with the special catalysis behavior and magnetism properties [3]. Schiff bases of pyridone and its complexes continue to be asubject of current interest. However, only limited Schiff bases of ketone have been reported up to now [4,5]. The crystal structure of the title compound is composed of acation Ni 2+ ,two Schiff base ligands and two SCN anion. The nickel atom is octahedrally coordinated by N1 and N2 from the Schiff base ligand, N3 and N4 from another Schiff base ligand and N5, N6 from two SCN ,which is in agreement with the rule of the optimal coordination number [6]. The bond length and bond angles of Schiff base ligands are in the normal ranges and in agreement with that of ketone Schiff base [7]. The C2=N2 and C16=N4 bond lengths of 1.281 (4)

Crystal structures and Hirshfeld surface analysis oftrans-bis(thiocyanato-κN)bis{2,4,6-trimethyl-N-[(pyridin-2-yl)methylidene]aniline-κ2N,N′}manganese(II) andtrans-bis(thiocyanato-κN)bis{2,4,6-trimethyl-N-[(pyridin-2-yl)methylidene]aniline-κ2N,N′}nickel(II))

“…Each metal(II) cation is located on a centre of inversion and adopts a distorted octahedral coordination environment with four N atoms from two symmetry-related PM-TMA ligands in the equatorial plane and two N atoms from symmetry-related NCS À anions in a trans axial arrangement. The M-N bond lengths [2.174 (2) to 2.312 (2) Å for (I) and 2.027 (3) to 2.184 (2) Å for (II)] and N-M-N bond angles [74.27 (6) to 180 for (I) and 78.4 (1) to 180 for (II)] for both complexes are all in the normal range for similar Schiff base complexes with Mn II (Chattopadhyay et al, 2002;Lucas et al, 2005) and Ni II (Guo, 2009;Layek et al, 2014) ions. Note that the Mn1-N1-C1 bond angle [164.3 (2) ] in (I) is somewhat more bent than the corresponding Ni1-N1-C1 bond angle [176.7 (3) ] in (II).…”