Synthesis, crystal structure and spectroscopic study of trans-diazidobis(2,4,6-trimethylpyridine)copper(II) and azidotetrakis(3-ethyl-4-methylpyridine)copper(II) nitrate; [Cu(s-collidine)2(N3)2] and [Cu(β-collidine)4(N3)](NO3)

Add time:08/22/2019    Source:sciencedirect.com

Two monomeric complexes of copper(II) azide with 2,4,6-trimethylpyridine and 3-ethyl-4-methylpyridine, namely trans-diazidobis(s-collidine)copper(II) (1) and azidotetrakis-(β-collidine)copper(II) nitrate (2), have been prepared and characterized by spectroscopic and X-ray crystallographic methods. The spectral results suggest terminal azido ligands in both complexes and ionic nitrate in 2. The structure of 1 consists of isolated polyhedra of trans-[Cu(2,4,6,-trimethylpyridine)2(N3)2], in which the copper atom is located at the inversion centre and has an almost regular square-planar geometry. The CuN(N3) and CuN(L) bond lengths are 1.954(4) and 2.022(3) Å, respectively. The terminal azido ligands are linear and slightly asymmetric [NαNβ = 1.184(5) and NβNγ = 1.163(6) Å]. The structure of complex 2 consists of isolated [Cu(3-ethyl-4-methylpyridine)4(N3]+ cations and NO3− counter anions. The coordination of the copper atom in the cation is a regular tetragonal pyramid with four collidine ligands occupying the basal sites [CuNav = 2.028(10) Å] and a terminal azido ligand at the apical position with a CuN distance of 2.193(7) Å.

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