Isolation and characterization of iridium(iii) and iridium(v) complexes of 2-(arylazo)pyridine and studies of amine fusion reactions at the coordinated diazo-ligandElectronic supplementary information (ESI) available: Fig. S1: 1H NMR spectra of 1a and tcc-[RuCl2(HL1a)2] in CDCl3. Inset: Methyl resonances of 1b. Fig. S2: 13C NMR spectra of 1a and tcc-[RuCl2(HL1a)2] in CDCl3. Fig. S3: Cyclic voltammogram of 1a in CH3CN. Fig. S4: Cyclic voltammogram of 2a in CH3CN. See http://www.rsc.org/suppdata/dt/b4/b407209j/