Synthesis, characterization, and crystal and molecular structures of the coordination compounds, [Me2Ga•O(C5H3N)CH2NMe2] and [Me2Ga•O(C9H6N)]2

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Abstract
Crystals of (2-dimethylaminomethyl-3-pyridolato)dimethylgallium are monoclinic, a = 13.443(3), b = 6.7563(3), c = 13.046(2) Å, β = 100.38(1)°, Z = 4, space group I2/m, and those of bis[(8-quinolinolato)dimethylgallium] are monoclinic, a = 9.7340(4), b = 12.7135(5), c = 9.6843(4) Å, β = 117.014(3)°, Z = 2, space group P21/c. Both structures were solved by conventional heavy atom methods and were refined by full-matrix least-squares procedures to R = 0.044 and 0.032 for 1485 and 1567 reflections with I ≥ 3σ(I), respectively. The structure of [Me2Ga•O(C5H3N)CH2NMe2] consists of discrete monomeric molecules which contain tetrahedrally coordinated gallium atoms. The bidentate anionic 2-dimethylaminomethyl-3-pyridolate ligand coordinates Ga via the oxygen and amino nitrogen atoms (Ga—O = 1.892(3), Ga—N = 2.127(4), Ga—C = 1.950(5) and 1.939(6) Å). The structure of [Me2Ga•O(C9H6N)]2 consists of centrosymmetric dimers which contain a nearly planar system of seven fused rings. The Ga atoms are five-coordinate, having distorted trigonal bipyramidal coordination geometry. The dimerization occurs via the formation of a central, planar, four-membered (Ga—O)2 ring in which each asymmetrically bridging oxygen atom occupies an equatorial coordination site on one gallium atom and an axial site on the other. Important geometrical parameters for [Me2Ga•O(C9H6N)]2 are Ga—O(eq) = 1.937(3), Ga—O(ax) = 2.297(3), Ga—N(ax) = 2.211(3), Ga—C(eq) = 1.948(6) and 1.945(5) Å, O(ax)—Ga—N(ax) = 149.7(1)°.

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