Intermediate species in thermal reactions between mixed ethylenediamine-o-phenanthroline cobalt(III) complexes and ammonium salts in the solid phase

G. Grassini-Strazza; A. Cristalli; V. Carunchio; A. Messina

doi:10.1016/0040-6031(80)87007-9

Intermediate species in thermal reactions between mixed ethylenediamine-o-phenanthroline cobalt(III) complexes and ammonium salts in the solid phase

G. Grassini-Strazza, A. Cristalli, V. Carunchio, A. Messina

Fondazione IRCCS Istituto Nazionale dei Tumori

Research output: Contribution to journal › Article › peer-review

Abstract

Solidsolid thermal reaction, in the range 140-180°C, between NH₄Cl or NH₄NO₃ and some cobalt(III) complexes containing ligands with only nitrogen as donor atoms, are reported. The products are separated by thin layer chromatography and characterized by direct spectrophotometry, scanning the plates after TLC. Only in the case of [Co-(o-phen)₂en]Y₃ (Y = Cl^-, NO^- ₃) is an effect of NH₄Cl found. The formation of two intermediate species is evidenced: the first, cis-Co(o-phen)₂Cl⁺ ₂, is obtained by substitution of an ethylenediamine molecule by chloride ions; the other, Co(o-phen)³⁺ ₃, by subsequent displacement of chloride ions by the free o-phenanthroline coming from intial decomposition of the complexes. On heating in the presence of NH₄NO₃ the complexes do not undergo any changes. The reactivity order is: [Co(en)₃]Y₃ ≅ [Co(o-phen)(en)₂]Y₃ <[Co(o-phen)₃]Y₃ <[Co(o-phen)₂en]Y₃.

Original language	English
Pages (from-to)	161-168
Number of pages	8
Journal	Thermochimica Acta
Volume	36
Issue number	2
DOIs	https://doi.org/10.1016/0040-6031(80)87007-9
Publication status	Published - Mar 1 1980

ASJC Scopus subject areas

Chemistry (miscellaneous)
Physical and Theoretical Chemistry

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title = "Intermediate species in thermal reactions between mixed ethylenediamine-o-phenanthroline cobalt(III) complexes and ammonium salts in the solid phase",

abstract = "Solidsolid thermal reaction, in the range 140-180°C, between NH4Cl or NH4NO3 and some cobalt(III) complexes containing ligands with only nitrogen as donor atoms, are reported. The products are separated by thin layer chromatography and characterized by direct spectrophotometry, scanning the plates after TLC. Only in the case of [Co-(o-phen)2en]Y3 (Y = Cl-, NO- 3) is an effect of NH4Cl found. The formation of two intermediate species is evidenced: the first, cis-Co(o-phen)2Cl+ 2, is obtained by substitution of an ethylenediamine molecule by chloride ions; the other, Co(o-phen)3+ 3, by subsequent displacement of chloride ions by the free o-phenanthroline coming from intial decomposition of the complexes. On heating in the presence of NH4NO3 the complexes do not undergo any changes. The reactivity order is: [Co(en)3]Y3 ≅ [Co(o-phen)(en)2]Y3 <[Co(o-phen)3]Y3 <[Co(o-phen)2en]Y3.",

author = "G. Grassini-Strazza and A. Cristalli and V. Carunchio and A. Messina",

year = "1980",

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T1 - Intermediate species in thermal reactions between mixed ethylenediamine-o-phenanthroline cobalt(III) complexes and ammonium salts in the solid phase

AU - Grassini-Strazza, G.

AU - Cristalli, A.

AU - Carunchio, V.

AU - Messina, A.

PY - 1980/3/1

Y1 - 1980/3/1

N2 - Solidsolid thermal reaction, in the range 140-180°C, between NH4Cl or NH4NO3 and some cobalt(III) complexes containing ligands with only nitrogen as donor atoms, are reported. The products are separated by thin layer chromatography and characterized by direct spectrophotometry, scanning the plates after TLC. Only in the case of [Co-(o-phen)2en]Y3 (Y = Cl-, NO- 3) is an effect of NH4Cl found. The formation of two intermediate species is evidenced: the first, cis-Co(o-phen)2Cl+ 2, is obtained by substitution of an ethylenediamine molecule by chloride ions; the other, Co(o-phen)3+ 3, by subsequent displacement of chloride ions by the free o-phenanthroline coming from intial decomposition of the complexes. On heating in the presence of NH4NO3 the complexes do not undergo any changes. The reactivity order is: [Co(en)3]Y3 ≅ [Co(o-phen)(en)2]Y3 <[Co(o-phen)3]Y3 <[Co(o-phen)2en]Y3.

AB - Solidsolid thermal reaction, in the range 140-180°C, between NH4Cl or NH4NO3 and some cobalt(III) complexes containing ligands with only nitrogen as donor atoms, are reported. The products are separated by thin layer chromatography and characterized by direct spectrophotometry, scanning the plates after TLC. Only in the case of [Co-(o-phen)2en]Y3 (Y = Cl-, NO- 3) is an effect of NH4Cl found. The formation of two intermediate species is evidenced: the first, cis-Co(o-phen)2Cl+ 2, is obtained by substitution of an ethylenediamine molecule by chloride ions; the other, Co(o-phen)3+ 3, by subsequent displacement of chloride ions by the free o-phenanthroline coming from intial decomposition of the complexes. On heating in the presence of NH4NO3 the complexes do not undergo any changes. The reactivity order is: [Co(en)3]Y3 ≅ [Co(o-phen)(en)2]Y3 <[Co(o-phen)3]Y3 <[Co(o-phen)2en]Y3.

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Intermediate species in thermal reactions between mixed ethylenediamine-o-phenanthroline cobalt(III) complexes and ammonium salts in the solid phase

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