Crystals of an antiferromagnetic 1,3‐butadiyne compared with a ferromagnetic 1,3,5‐hexatriyne carrying a 4‐Chloro‐3‐(N‐tent‐butyl‐N‐oxyamino)phenyl Group as a Persistent Free Radical Substituent

Persistent organic radicals with a ferromagnetic interaction in the crystalline state are few and far between. One example is crystalline 1,3,5‐hexatriyne carrying a [4‐chloro‐3‐(N‐tert‐butyl‐N‐oxyamino)‐phenyl] substituent at position 1. This has been studied and compared with crystalline 1,3‐butadiyne (see Figure) carrying the same substituent, which, in contrast, exhibits antiferromagnetic interactions at cryogenic temperatures. magnified image