80997-17-7Relevant academic research and scientific papers
Synthesis and reactivity of bis(1,4-diaryltetraazabutadiene)nickel complexes. Crystal and molecular structure of bis[1,4-bis(3,5-dimethylphenyl)tetraazabutadiene]nickel
Overbosch, Peter,Van Koten, Gerard,Overbeek
, p. 2373 - 2378 (2008/10/08)
Bis(tetraazabutadiene)nickel complexes, [Ni(Ar2N4)2], have been prepared by reactions of bis(1,5-cyclooctadiene)nickel or bis(cyclopentadienyl)nickel with aryl azides (Ar = 4-MeC6H4, 4-MeOC6H4, 4-ClC6H4, and 3,5-Me2C6H3). The reaction with bis(cyclopentadienyl)nickel proceeds via [Ni(Ar2N4)(η5-C5H5)]. The crystal and molecular structure of bis[1,4-bis(3,5-dimethylphenyl)tetraazabutadiene]nickel, which is the first example of a bis(tetraazabutadiene)metal complex, have been determined by a single-crystal X-ray diffraction study. Crystals are tetragonal, space group P42/n, with Z = 2 in a unit cell of dimensions a = b = 9.677 (1) and c = 16.601 (1) A?. The final R value is 0.034 for 1307 reflections. The nickel atom has a pseudotetrahedral geometry with two planar Ar2N4 ligands orientated perpendicular to each other. Furthermore the three N-N bond distances are nearly equal with a mean value of 1.322 A?. On the basis of these structural features the compounds are formulated as 18e Ni0 species. Bis[1,4-bis(4-tolyl)tetraazabutadiene]nickel reacts with tert-butyl isocyanide to give [Ni[1,4-(4-MeC6H4)2N4](t-BuNC) 2]. The latter product could also be prepared via the 1/1 reaction of [Ni[1,4-(4-MeC6H4)2N4]2] with [Ni(t-BuNC)4] in the presence of excess t-BuNC.
