Crystal structures and nitrosation reactions of triazido complexes of chromium(III)

Abstract

Two triazido chromium(III) complexes [Cr(tame)(N₃)₃] · H₂O (1) and [Cr(tacn)(N₃)₃] (2) (tame = 1,1,1-tris(aminomethyl)ethane and tacn = 1,4,7-triazacyclononane) have been prepared and characterized by single-crystal X-ray crystallography at 122 K. The crystal structure of 1 is monoclinic, space group P2₁/c, with a = 9.2460(9), b = 11.0500(11), c = 13.1980(9) Å, β = 97.244(7)° with four formula units in the cell. The crystal structure of 2 is triclinic, space group , with a = 7.698(4), b = 8.5800(6), c = 10.236(3) Å, α = 89.497(15), β = 83.70(2), γ = 72.83(2)° with two formula units in the cell. The reactions between NOBF₄ and 1 or 2 in acetonitrile give [Cr(tame)(NCCH₃)₃](BF₄)₃ and [Cr(tacn)(NCCH₃)₃](BF₄)₃, respectively.

Keywords:

• Triazido complexes
• Chromium(III)
• Nitrosation
• Crystal structure
• Photolysis