Table 3. Selected geometric parameters (Å, °) for (I) .
| C31—C32 | 1.3982 (17) | C32—O321 | 1.3618 (13) |
| C32—C33 | 1.3956 (16) | O321—C321 | 1.428 (2) |
| C31—C311 | 1.4136 (16) | C311—N311 | 1.1471 (17) |
| C31—C312 | 1.4224 (16) | C312—N312 | 1.1498 (16) |
| C33—C331 | 1.4261 (17) | C331—N331 | 1.1504 (16) |
| C33—C332 | 1.4181 (16) | C332—N332 | 1.1522 (16) |
| C32—C31—C311 | 119.84 (11) | C32—C33—C331 | 119.94 (10) |
| C32—C31—C312 | 123.31 (10) | C32—C33—C332 | 124.72 (11) |
| C311—C31—C312 | 116.80 (11) | C331—C33—C332 | 115.15 (10) |
| N311—C311—C31 | 178.44 (17) | C31—C32—C33 | 127.46 (10) |
| N312—C312—C31 | 178.53 (13) | O321—C32—C31 | 118.45 (10) |
| N331—C331—C33 | 176.77 (13) | O321—C32—C33 | 114.02 (10) |
| N332—C332—C33 | 175.54 (13) | ||
| C31—C32—C33—C331 | −171.92 (11) | C31—C32—O321—C321 | 76.5 (3) |
| C31—C32—C33—C332 | 13.3 (2) | C33—C32—O321—C321 | −106.2 (3) |
| C33—C32—C31—C311 | −166.68 (12) | C32—O321—C321—C322 | −156.1 (4) |
| C33—C32—C31—C312 | 10.92 (19) |