Synthesis and study of complexes of copper(II), zinc, cobalt(II) and nickel(II) with nitrofluorenylidene 9-amino(imino) derivatives
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STRASHNOVA, Svetlana, ZHUK, M, KOVALCHUKOVA, Olga, STRASHNOV, P., ZAITEV, Boris. Synthesis and study of complexes of copper(II), zinc, cobalt(II) and nickel(II) with nitrofluorenylidene 9-amino(imino) derivatives. In: Chemistry Journal of Moldova, 2009, nr. 2(4), pp. 68-71. ISSN 1857-1727.
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Chemistry Journal of Moldova
Numărul 2(4) / 2009 / ISSN 1857-1727 /ISSNe 2345-1688

Synthesis and study of complexes of copper(II), zinc, cobalt(II) and nickel(II) with nitrofluorenylidene 9-amino(imino) derivatives

Pag. 68-71

Strashnova Svetlana, Zhuk M, Kovalchukova Olga, Strashnov P., Zaitev Boris
 
 
Disponibil în IBN: 2 decembrie 2013


Rezumat

The complexes of general formula MCl2·L1-4·nH2O (where L1 - N-(2,4,7-trinitrofluorenilidene-9)-p-dimethyl-aminoanilin, L2 - N-(2,4,5,7-tetranitrofluorenilidene-9)-p-dimethylaminoaniline, L3 - N-(2,4,7-trinitrofluorenilidene)-N-(p-dimethylaminophenyl) hydroxylamine, L4 - N-(2,4,5,7-tetranitrofluorenilidene-9)-N-(p-dimethylaminophenyl)-hydroxylamine; M=Cu, Co, Ni, Zn; n= 1-3 have been synthesized and investigated by different methods. Spectral criteria of co-ordination of the molecules L1 – L4 in electronic absorption spectra were detected. In experimental spectra, the high-frequency band disappears, so the co-ordination occurs through a lone electron pair of a N-atom of the amino-group, and the ligand exists in a molecular form. A constant of acidic dissociation of L3 is determined spectrophotometrically: рКa = 2,07. Geometric optimization of L1 – L4 was performed, and the effect of monoprotonation on the electron density was assessed quantum chemically. It was shown that the strongest change of the electron density while protonation occurs at the tertiary amine nitrogen.

Cuvinte-cheie
3d metals; complexes; nitrofluoreniliden-9-anilin; amino-group