New template reactions of salicylaldehyde S-methyl-isothiosemicarbazone with 2-formylpyridine promoted by Ni(II) or Cu(II) metal ions

作者：Revenco Mihail D^*; Palamarciuc Oleg V; Bourosh Paulina N; Lipkowski Janusz; Gdaniec Maria; Simonov Yurii A; Clerac Rodolphe

来源：Inorganica Chimica Acta, 2011, 368(1): 157-164.

DOI：10.1016/j.ica.2010.12.068

• Template reaction
• Isothiosemicarbazide ligand
• X-ray crystal structure
• Nickel(II) complex
• Copper(II) complex
• Magnetic properties

The template reaction between salicylaldehyde S-methyl-isothiosemicarbazone and 2-formylpyridine in presence of nickel(II) or copper(II) salts yields two new coordination compounds with general formula [NiL(1)](2) (1) and [CuL(2)](2) (2) (L(1) = the dianionic (N(1)-salicylidene)(N(4)-(hydroxy(pyridin- 2- yl) methyl) Smethyl- isothiosemicarbazide) ligand and L2 = the doubly deprotonated (N(1)-salicylidene)(N(4)-(picolinoyl) S- methyl- isothiosemicarbazide) ligand). In the complex 1, the formed L(1) ligand appears as result of an addition reaction of the precursors, while for 2 a redox mechanism is implicated in the formation of L(2). Despite the fact that the initial organic precursors are the same, the resulting ligands obtained in the template reaction are different. In 1, the Ni(II) metal ion adopts a square- planar geometry and the [NiL(1)] units are forming dimerized chains through weak Ni center dot center dot center dot Ni interactions (3.336 and 3.632 angstrom). In 2, the Cu(II) metal ions adopt a square- pyramidal geometry and form dinuclear species through weak Cu center dot center dot center dot O (phenoxo) interactions. The magnetic susceptibility measurements of the complexes reveal the diamagnetic nature of 1 as expected for a square planar Ni(II) complex and a paramagnetic behavior for 2 with weak intra- dimer antiferromagnetic interaction (J/k(B) = -2.1(1) K).

• 出版日期2011-3-15