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The crystal and molecular structure of the four-coordinate complex Ni(C22H22N4) containing the tetramethyldibenzotetraaza[14] annulene ligand has been determined from three-dimensional X-ray diffraction data. The complex crystallized in the monoclinic space group C2h5-P21/n with cell dimensions a=14.7967(10), b=11.2169(6), c=11.4510(6) A, and β=98.467(5)° with Z=4. The final agreement indices from the least-square refinement of 245 variables with 3111 observations F>3σ(F), are R=0.050, Rw=0.037. The structure has a pronounced saddle-shaped conformation with Ni atom at the saddle point coordinated to four nitrogen atoms. The average Ni-N distance is 1.866(3) A. The delocalized propane-1,3-diiminato chelate rings and the benzene rings are linked by nominally single C-N bonds. |
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