New Organic Functional Anions: Ferrocenyl-(CONHCH2SO3−)n (n = 1-2) and their TTF Salts

New organic functional anions that includes the ferrocenyl group, CpFeCp-CONHCH2SO3− and Fe(Cp-CONHCH2SO3−)2, are prepared as tetraphenylphosphonium (PPh4) salts. They reacted with (TTF)3(BF4)2 to give TTF monocation salts. The X-ray analyses indicate that for all salts TTF forms a dimer which is separated by the relatively larger anions. The oxidation reaction of (PPh4)(CpFeCp-CONHCH2SO3) with I2 gave the Zwitter-ion, CpFe+Cp-CONHCH2SO3−, which shows a Curie-Weiss behavior (C = 0.800 emu·K/mol, θ = −1.13 K) with weak antiferromagnetic interaction. This magnetic moment is found to be attributed to the ferrocenyl radical.