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Mo(NO)(N 3 ) 3 terpy was obtained in form of yellow platelets from Mo(CO) 3 terpy and (CH 3 ) 3 SiN 3  in nitroethane as solvent. It crystallizes in the triclinic space group P1̄ with the lattice parameters a = 817.3, b = 866.7, c = 1416.2 pm, a = 71.97°, β = 102.15°, γ = 107.34°. The unit cell contains two monomeric complexes in which the central Mo atom exhibits the coordination number seven in a slightly distorted pentagonal bipyramid. One azido group and the nitrosyl ligand are in axial positions. NO +  coordinates in a linear arrangement (Mo-N-O = 176.2°) and acts as a three electron donor completing the noble gas configuration for the molybdenum atom. A weak trans effect of the NO-ligand causes different Mo-N distances to the axial (Mo-N31 = 218.4 pm) and the equatorial (Mo-N11 = 211.3, Mo-N21 = 212.9 pm) azido groups.

Synthese und Kristallstruktur von Mo(NO)(N 3 ) 3 terpy, einem Nitrosyl-azido-Komplex des Molybdäns mit siebenfacher Koordination