The suggested isomerism of some NiL4Br2 complexes (where L is benzimidazole) was investigated by thermoanalytical techniques coupled with an FT-IR system and supported by spectroscopic techniques. Starting from compound NiL4Br2. (acetone)2 two main routes of thermal decomposition were found, the first one corresponding to a family of tetragonally distorted octahedral compounds and the second corresponding to square planar complexes. Reflectance and IR spectra were obtained at room temperature. Analysis of the data supports the theory that in the family of tetragonally distorted octahedral compounds two main structures are possible: (i) a dimeric cationic structure where the axial position is occupied by three bromide ions, one acting as a bridge between two nickel(II) ions while the fourth bromide is the counter ion; and (ii) a monomeric neutral structure where two bromides are in both axial sites. The dimeric structure changes to the monomeric one by a temperature-induced anation reaction. Two chloroform solvate compounds were also prepared. Desolvation mechanisms are discussed, new procedures are suggested for obtaining the already known compounds, and some new compounds of the series have also been prepared.

NICKEL(II) BENZIMIDAZOLE BROMIDE COMPLEXES - DISCUSSION OF THE PROPOSED ISOMERISM BY THERMOANALYTICAL INVESTIGATION / Materazzi, Stefano; D'Ascenzo, Giuseppe; Curini, Roberta; Fava, L.. - In: THERMOCHIMICA ACTA. - ISSN 0040-6031. - STAMPA. - 288:(1993), pp. 197-212. [10.1016/0040-6031(93)80289-M]

NICKEL(II) BENZIMIDAZOLE BROMIDE COMPLEXES - DISCUSSION OF THE PROPOSED ISOMERISM BY THERMOANALYTICAL INVESTIGATION

MATERAZZI, Stefano;D'ASCENZO, Giuseppe;CURINI, Roberta;
1993

Abstract

The suggested isomerism of some NiL4Br2 complexes (where L is benzimidazole) was investigated by thermoanalytical techniques coupled with an FT-IR system and supported by spectroscopic techniques. Starting from compound NiL4Br2. (acetone)2 two main routes of thermal decomposition were found, the first one corresponding to a family of tetragonally distorted octahedral compounds and the second corresponding to square planar complexes. Reflectance and IR spectra were obtained at room temperature. Analysis of the data supports the theory that in the family of tetragonally distorted octahedral compounds two main structures are possible: (i) a dimeric cationic structure where the axial position is occupied by three bromide ions, one acting as a bridge between two nickel(II) ions while the fourth bromide is the counter ion; and (ii) a monomeric neutral structure where two bromides are in both axial sites. The dimeric structure changes to the monomeric one by a temperature-induced anation reaction. Two chloroform solvate compounds were also prepared. Desolvation mechanisms are discussed, new procedures are suggested for obtaining the already known compounds, and some new compounds of the series have also been prepared.
1993
DIVALENT METAL-IONS; INTERESTING COORDINATION-COMPOUNDS; THERMAL-BEHAVIOR
01 Pubblicazione su rivista::01a Articolo in rivista
NICKEL(II) BENZIMIDAZOLE BROMIDE COMPLEXES - DISCUSSION OF THE PROPOSED ISOMERISM BY THERMOANALYTICAL INVESTIGATION / Materazzi, Stefano; D'Ascenzo, Giuseppe; Curini, Roberta; Fava, L.. - In: THERMOCHIMICA ACTA. - ISSN 0040-6031. - STAMPA. - 288:(1993), pp. 197-212. [10.1016/0040-6031(93)80289-M]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/466278
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