首页|Structure and properties of mono-anionic deprotonated trans-HIndigo~-.Effect of deprotonation and reduction on trans-H2Indigo
Structure and properties of mono-anionic deprotonated trans-HIndigo~-.Effect of deprotonation and reduction on trans-H2Indigo
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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~+HHmdigo~-]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(Co~(II)Cl2)]~--C6H4Cl2@and {cryptand(K~+)}[Hrndigo(Ni~(II)Cl2)]~@to be studied.Tetrahedral Co~(II)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 HIndigo~(·-)radical anions.It is shown that absorption bands of HIndigo"are red-shifted relative to those of HIndigo~(·-)allowing reduced and deprotonated forms of irans-indigo to be distinguished.HIndigo"anions are EPR silent and diamagnetic in contrast to paramagnetic HIndigo~(·-)radical anions.
Vat dyesIndigoDeprotonationChelating complexesCrystal structureOptical and magnetic properties
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