Abstract
Mono-deprotonated HIndigo– anions have been selectively generated by a direct interaction of H2Indigo with cesium metal in toluene. Following interaction with cryptand allows one to isolate crystalline complex {cryptand(Cs+)}(Cs+)⋅[HIndigo–]2⋅C6H4Cl2 (1). Methods for preparation of chelated complexes of HIndigo– with cobalt(II) and nickel(II) halides have also been developed allowing structure and properties of crystalline {CV+}[HIndigo(CoIICl2)]−⋅C6H4Cl2 (2) and {cryptand(K+)}[HIndigo(NiIICl2)]− (3) to be studied. Tetrahedral CoII atoms in 2 have high-spin S = 3/2 state which is evidenced from corresponding EPR spectra and SQUID measurements. Molecular structure and properties of HIndigo– anions have been studied in the obtained complexes and compared with those of mono-reduced H2Indigo•− radical anions. It is shown that absorption bands of HIndigo– are red-shifted relative to those of H2Indigo•− allowing reduced and deprotonated forms of trans-indigo to be distinguished. HIndigo– anions are EPR silent and diamagnetic in contrast to paramagnetic H2Indigo•− radical anions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call