The solid state chemistry of acridizinium salts

✍ Scribed by Wang-Nang Wang; William Jones

• Publisher: Elsevier Science
• Year: 1987
• Tongue: French
• Weight: 438 KB
• Volume: 43
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(01)90248-0

✦ Synopsis

t_he crys_tal chemistry of various acridizinium salts (with Br , Cl , I , ClO. , BF. , picrate and oxalate as the counter anions) have been prepar;d and* the X-ray structures have been determined. Despite the large movement of the acridizinium ions in the [4+41 photodimerization, the majority of these salts are able to undergo single crystal -> single crystal conversion; this is especially demonstrated in the acridizinium halide salts containing water of crystallization. All the acridizinium salts described in this paper are ohotoreactive. the relative extent of conversion oer unit time -as assessed by monitoring the-loss o_f the I_R absorption associated with the C=C bond-beinq I > Br > Cl studies -of > ClO. = BF. 3 Picrate = Oxalate. Detailed acridizinium bramide king single crystal diffractometry and powder X-ray methods, show that there are two polymorphic phases for the monomer.

Preliminary evidence for the fate of the co-crystallised water during photoreaction has been obtained from differential scanning calorimetry.