The Crystal and Molecular Structure of Anhydrous Zinc 8-Quinolinolate Complex, [Zn(C9H6NO)2]4

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Abstract
The molecular structure of an anhydrous zinc 8-quinolinolate obtained by sublimation has been determined by means of X-ray diffraction. The complex forms triclinic crystals; a=11.858(1), b=13.019(2), c=10.834(1) Å, α=106.56(1), β=109.00(1), and γ=74.14(1)°, space group P\bar1 (No. 2) with one [Zn(C9H6NO)2]4 molecule. The structure was solved by the heavy atom method and refined by the block-diagonal least-squares procedure to R=0.043 for 3320 non-zero reflections. The molecule is centrosymmetric and tetrameric; four [Zn(C9H6NO)2] units being connected by oxygen atoms of 8-quinolinolate ligands. Two types of bridging oxygen atoms were found. Two crystallographically independent zinc atoms take different geometries, hexa-, and pentacoordinations.