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DATB<br />

4. PHYSICAL PROPERTIES<br />

4.1 Crystal Structure. 8,4 Two crystalline polymorphs of DATB have been iden-<br />

tified. The cell parameters of Form I, stable to 217’C, and of Form II are given.<br />

4.2 Density.s*4<br />

Cell Parameters<br />

Unit cell edge length (ft)<br />

Angle P<br />

Molecules per unit cell<br />

Method of<br />

Determination State<br />

X-ray<br />

Direct measurement<br />

;<br />

C<br />

Solid 23<br />

Solid 23<br />

Form I Form II<br />

7.30 f 0.01 7.76<br />

5.20 f 0~01 9.04<br />

11.63 f 0.02 12.84<br />

95.90 f 0.3”<br />

2<br />

Temperature<br />

(CO)<br />

103.0<br />

4<br />

Density (g/ems)<br />

Form I<br />

1.838<br />

1.837<br />

Form II<br />

1.84<br />

1.815<br />

DATB powder can be pressed into pellets. No quantitative pressing data is<br />

available.<br />

36<br />

4.3 Infrared Spectrum. See Fig. 1.<br />

2.5 4<br />

WAVELENGTH (pm)<br />

6 8 14<br />

WAVE NUMBER I I/cm)<br />

Fig. 1. Infrared spectrum.

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