Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated

As a basis for the description of dehydration mechanisms, the molecular structures of two copper(II) dipicolinates, Cu(dipic).2H2O (triclinic) and Cu(dipic).3H2O, are presented and compared with those of other copper(II) dipicolinates. The kinetics of the isothermal dehydration of the monoclinic and...

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Detalles Bibliográficos
Publicado: 1997
Materias:
A. organometallic compounds
C. thermogravimetric analysis (TGA)
C. X-ray diffraction
D. crystal structure
Copper compounds
Crystal structure
Dehydration
Diffusion in solids
Mathematical models
Molecular structure
Optical microscopy
Reaction kinetics
Thermal effects
Thermogravimetric analysis
X ray crystallography
Avrami Erofe'ev model
Organometallics
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223697_v58_n7_p1127_Sileo
http://hdl.handle.net/20.500.12110/paper_00223697_v58_n7_p1127_Sileo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00223697_v58_n7_p1127_Sileo2023-06-08T14:50:17Z Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated A. organometallic compounds C. thermogravimetric analysis (TGA) C. X-ray diffraction D. crystal structure Copper compounds Crystal structure Dehydration Diffusion in solids Mathematical models Molecular structure Optical microscopy Reaction kinetics Thermal effects Thermogravimetric analysis X ray crystallography Avrami Erofe'ev model Organometallics As a basis for the description of dehydration mechanisms, the molecular structures of two copper(II) dipicolinates, Cu(dipic).2H2O (triclinic) and Cu(dipic).3H2O, are presented and compared with those of other copper(II) dipicolinates. The kinetics of the isothermal dehydration of the monoclinic and triclinic polymorphs of Cu(dipic).2H2O were measured. The monoclinic variety dehydrates in a two-step process; a linear α/t relationship is found for the first step and a two-dimensional diffusion-controlled reaction (D2) law ((1 - α) 1n(1 - α) + α = kt) for the second. Triclinic Cu(dipic).2H2O dehydrates in a one-step process, The relation between a and time is linear at lower temperatures but gradually changes to an Avrami-Erofe'ev (A2) model (-1n(1 - α)1/n = kt) at higher temperatures. A qualitative model based on optical microscopic observations, structural determinations and thermogravimetric data is proposed. The general relationship between dehydration behavior and structure in this series of compounds is discussed. © 1997 Elsevier Science Ltd. All rights reserved. 1997 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223697_v58_n7_p1127_Sileo http://hdl.handle.net/20.500.12110/paper_00223697_v58_n7_p1127_Sileo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic A. organometallic compounds
C. thermogravimetric analysis (TGA)
C. X-ray diffraction
D. crystal structure
Copper compounds
Crystal structure
Dehydration
Diffusion in solids
Mathematical models
Molecular structure
Optical microscopy
Reaction kinetics
Thermal effects
Thermogravimetric analysis
X ray crystallography
Avrami Erofe'ev model
Organometallics
spellingShingle A. organometallic compounds
C. thermogravimetric analysis (TGA)
C. X-ray diffraction
D. crystal structure
Copper compounds
Crystal structure
Dehydration
Diffusion in solids
Mathematical models
Molecular structure
Optical microscopy
Reaction kinetics
Thermal effects
Thermogravimetric analysis
X ray crystallography
Avrami Erofe'ev model
Organometallics
Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
topic_facet A. organometallic compounds
C. thermogravimetric analysis (TGA)
C. X-ray diffraction
D. crystal structure
Copper compounds
Crystal structure
Dehydration
Diffusion in solids
Mathematical models
Molecular structure
Optical microscopy
Reaction kinetics
Thermal effects
Thermogravimetric analysis
X ray crystallography
Avrami Erofe'ev model
Organometallics
description As a basis for the description of dehydration mechanisms, the molecular structures of two copper(II) dipicolinates, Cu(dipic).2H2O (triclinic) and Cu(dipic).3H2O, are presented and compared with those of other copper(II) dipicolinates. The kinetics of the isothermal dehydration of the monoclinic and triclinic polymorphs of Cu(dipic).2H2O were measured. The monoclinic variety dehydrates in a two-step process; a linear α/t relationship is found for the first step and a two-dimensional diffusion-controlled reaction (D2) law ((1 - α) 1n(1 - α) + α = kt) for the second. Triclinic Cu(dipic).2H2O dehydrates in a one-step process, The relation between a and time is linear at lower temperatures but gradually changes to an Avrami-Erofe'ev (A2) model (-1n(1 - α)1/n = kt) at higher temperatures. A qualitative model based on optical microscopic observations, structural determinations and thermogravimetric data is proposed. The general relationship between dehydration behavior and structure in this series of compounds is discussed. © 1997 Elsevier Science Ltd. All rights reserved.
title Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
title_short Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
title_full Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
title_fullStr Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
title_full_unstemmed Kinetic study of the thermal dehydration of copper(II) dipicolinates: Crystal and molecular structure of Cu(II) (pyridine 2,6-dicarboxylato) DI- and trihydrated
title_sort kinetic study of the thermal dehydration of copper(ii) dipicolinates: crystal and molecular structure of cu(ii) (pyridine 2,6-dicarboxylato) di- and trihydrated
publishDate 1997
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223697_v58_n7_p1127_Sileo
http://hdl.handle.net/20.500.12110/paper_00223697_v58_n7_p1127_Sileo
_version_ 1768542585972850688

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