Table 10.
Structural features of less common E–X–Y linear chalcogendihalides of the CT type, characterized by X-ray diffraction analysis.
| Compound reference code | E | X | Y | E–X (Å) | X–Y (Å) | ∠ E–X–Y(°)(a) | References |
|---|---|---|---|---|---|---|---|
| HAMCII | S | I | Cl | 2.534 | 2.761 | 176.4 | [510] |
| LIFXIH | S | I | Cl | 2.556 | 2.604 | 179.9 | [555] |
| NAHQIX | S | I | Cl | 2.575 | 2.558 | 176.1 | [553] |
| SIBJOC | S | I | Cl | 2.641 | 2.586 | 174.9 | [554] |
| RORNIV(b) | S | Br | Br | 2.299 | 2.717 | 175.0 | [562] |
| RORNIV01(b) | S | Br | Br | 2.328 | 2.705 | 176.0 | [63] |
| IRABEI(c) | Se | Br | Br | 2.645 | 2.358 | 174.2 | [559] |
| LIGFIQ | Se | I | Cl | 2.625 | 2.690 | 178.9 | [555] |
| LIGFIQ01 | Se | I | Cl | 2.618 | 2.690 | 178.7 | [148] |
| OXSEIC | Se | I | Cl | 2.630 | 2.731 | 175.8 | [556] |
| NOWLOA | Se | I | Br | 2.808 | 2.641 | 177.3 | [30] |
| NOWLUG | Se | I | Br | 2.664 | 2.797 | 175.8 | [30] |
| WIPPAM | Se | I | Br | 2.636 | 2.813 | 177.1 | [148] |
| YEYFIR | Se | I | Br | 2.689 | 2.908 | 176.9 | [42] |
(a)The angle values are rounded off to the first decimal. (b)Polymorphs. (c)This is the unique example of CT type adduct between a selenium donor with bromine: the formation of a Br–Se–Br group determines very favorable electronic and steric effects to prevent the formation of the same arrangement on the second selenium atom and to promote the CT type adduct. It must be noted that the Se ⋯ Br interaction is enough weak to determine a lengthening of the Br–Br bond of only 0.078 Å.