Journal
INORGANIC CHEMISTRY
Volume 42, Issue 17, Pages 5153-5157Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic030009c
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In acetonitrile, the reaction of hydrated InCl3 and 2-[(2-(pyridylamino)phenylazo]pyridine [HL] affords an ink-blue octahedral indium(III) complex having the formula [InCl3(HL)]. The compound is a zwitterion in which the positive and the negative charges reside on the extended ligand HL. The secondary amine nitrogen in it is deprotonated, while the free pyridyl nitrogen is protonated. The reaction of ZnCl2, on the other hand, produces a di-metallic complex, [Zn2Cl2L2], where the two metal ions are bridged across the deprotonated ligand [L](-). The color of the di-zinc complex is also ink blue. Interestingly, the UV-vis spectrum of the indium compound is almost identical to that of the di-zinc compound. Long-wavelength transitions near 590 nm in these examples are assigned to intraligand pi-pi* transitions.
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