2-methyl-8-quinolinolato groups are similar to those found in the oxovanadium complex and in the aluminum(III) complex (J).The equation of the least-squares plane, with respect to the crystallographic axes, through the 2-methyl-8-quinolinolato group defined by the atoms N(l), C(l), . . . C(11), 0(12) is: 0.215* + 0.677T -0.728Z = -4.162 (Plane 2) and through the 2-methyl-8-quinolinolato group defined by the atoms N(21), C(22), . . . C(31), 0(32)is:-0.495* + 0.030Y + 0.999Z = 6.242where *, Y, and Z are in Á. The distances from the atoms in each of these groups to their respective planes are given in Table VIII. The carbon atom of the methyl group, C(ll), shows the maximum deviation (0.063 A) from Plane 2, and a ring carbon atom, C( 24), shows the maximum deviation (0.028 Á) from Plane 3. The gallium atom which is not included in the calculation of the least-squares planes lies 0.099 Á above Plane 3 and 0.133 Á below Plane 2. Although the coordinated 2-methyl-8-quinolinolato groups are approximately planar, there is considerably more distortion in this structure than in the oxovanadium(IV) structure. A comparison of the dihedral angles between the two intramolecular planes of the 2-methyl-8-quinolinolato groups reveals an important difference in the two structures. In the oxovanadium(IV) complex, the dihedral angle is 44°1', whereas in the gallium complex it is 69°45'. The distance between the 2-methyl-8-quinolinolato planes that are related by the center of symmetry (V4, lU, V4), is 3.55 A. The 2-methyl-8quinolinolato planes which are packed in a direction almost perpendicular to the c-axis are 3.89 Á apart when related by a center of symmetry, and 3.99 Á apart when related by a twofold axis (Figure 7). Intermolecular contacts that are less than 3.5 Á are shown in Figure 8.

The analysis of ambient air for N02 concentrations of 1 ppm and below was originally reported by Saltzman in 1954 (1). Since that time the method has been applied to the analysis 15 53 53

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