Combined in situ EDXRD/EXAFS investigation of the crystal growth of [Co(C6H18N4)][Sb2S4] under solvothermal conditions: Two different reaction pathways leading to the same product

Wolff-Ragnar Kiebach, Nicole Pienack, Marie-Eve Ordolff, Felix Studt, Wolfgang Bensch

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The crystal growth and kinetics of the formation of [Co(C6H 18N4)][Sb2S4] were investigated under solvothermal conditions with combined in situ EDXRD (energy dispersive X-ray diffraction) and in situ EXAFS (extended X-ray absorption fine structure) at different temperatures. In the overwhelming number of reactions all product reflections occur simultaneously in the EDXRD spectra. A detailed analysis of the extent of reaction α vs time clearly shows that the mechanism changes during the reaction. Such a change occurs at different temperatures after different reaction times. At the early stages the reactions are controlled by diffusion, and later the reaction exponents m suggest a more complex behavior. At the end of the formation of [Co(C6H18N 4)][Sb2S4] a second phase is formed which does not contain Co. The results of the in situ experiments suggest that [Co(C 6H18N4)][Sb2S4] is not only a metastable phase but rather that the second product crystallizes because the Co2+ concentration in solution is too low for further formation of [Co(C6H18N4)][Sb2S4]. In the minor cases of the solvothermal reaction a very different growth was observed. At the beginning only one intense reflection occurs in the spectra and after a distinct time all other reflections start to grow simultaneously. This strange behavior indicates that disordered layers are formed at the beginning which start to arrange at later stages, yielding the three-dimensional long-range order. The in situ EXAFS experiments performed at the Sb K-edge demonstrate that, independent of the reaction time, the Sb/S ratio, and the amine applied, only the two species SbS3 and SbS4 are present in solution. © 2006 American Chemical Society.
Original languageEnglish
JournalChemistry of Materials
Volume18
Issue number5
Pages (from-to)1196-1205
ISSN0897-4756
DOIs
Publication statusPublished - 2006
Externally publishedYes

Cite this

@article{26d08a162be443199eba33ec37382a40,
title = "Combined in situ EDXRD/EXAFS investigation of the crystal growth of [Co(C6H18N4)][Sb2S4] under solvothermal conditions: Two different reaction pathways leading to the same product",
abstract = "The crystal growth and kinetics of the formation of [Co(C6H 18N4)][Sb2S4] were investigated under solvothermal conditions with combined in situ EDXRD (energy dispersive X-ray diffraction) and in situ EXAFS (extended X-ray absorption fine structure) at different temperatures. In the overwhelming number of reactions all product reflections occur simultaneously in the EDXRD spectra. A detailed analysis of the extent of reaction α vs time clearly shows that the mechanism changes during the reaction. Such a change occurs at different temperatures after different reaction times. At the early stages the reactions are controlled by diffusion, and later the reaction exponents m suggest a more complex behavior. At the end of the formation of [Co(C6H18N 4)][Sb2S4] a second phase is formed which does not contain Co. The results of the in situ experiments suggest that [Co(C 6H18N4)][Sb2S4] is not only a metastable phase but rather that the second product crystallizes because the Co2+ concentration in solution is too low for further formation of [Co(C6H18N4)][Sb2S4]. In the minor cases of the solvothermal reaction a very different growth was observed. At the beginning only one intense reflection occurs in the spectra and after a distinct time all other reflections start to grow simultaneously. This strange behavior indicates that disordered layers are formed at the beginning which start to arrange at later stages, yielding the three-dimensional long-range order. The in situ EXAFS experiments performed at the Sb K-edge demonstrate that, independent of the reaction time, the Sb/S ratio, and the amine applied, only the two species SbS3 and SbS4 are present in solution. {\circledC} 2006 American Chemical Society.",
author = "Wolff-Ragnar Kiebach and Nicole Pienack and Marie-Eve Ordolff and Felix Studt and Wolfgang Bensch",
year = "2006",
doi = "10.1021/cm051788t",
language = "English",
volume = "18",
pages = "1196--1205",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "5",

}

Combined in situ EDXRD/EXAFS investigation of the crystal growth of [Co(C6H18N4)][Sb2S4] under solvothermal conditions: Two different reaction pathways leading to the same product. / Kiebach, Wolff-Ragnar; Pienack, Nicole; Ordolff, Marie-Eve; Studt, Felix; Bensch, Wolfgang.

In: Chemistry of Materials, Vol. 18, No. 5, 2006, p. 1196-1205.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Combined in situ EDXRD/EXAFS investigation of the crystal growth of [Co(C6H18N4)][Sb2S4] under solvothermal conditions: Two different reaction pathways leading to the same product

AU - Kiebach, Wolff-Ragnar

AU - Pienack, Nicole

AU - Ordolff, Marie-Eve

AU - Studt, Felix

AU - Bensch, Wolfgang

PY - 2006

Y1 - 2006

N2 - The crystal growth and kinetics of the formation of [Co(C6H 18N4)][Sb2S4] were investigated under solvothermal conditions with combined in situ EDXRD (energy dispersive X-ray diffraction) and in situ EXAFS (extended X-ray absorption fine structure) at different temperatures. In the overwhelming number of reactions all product reflections occur simultaneously in the EDXRD spectra. A detailed analysis of the extent of reaction α vs time clearly shows that the mechanism changes during the reaction. Such a change occurs at different temperatures after different reaction times. At the early stages the reactions are controlled by diffusion, and later the reaction exponents m suggest a more complex behavior. At the end of the formation of [Co(C6H18N 4)][Sb2S4] a second phase is formed which does not contain Co. The results of the in situ experiments suggest that [Co(C 6H18N4)][Sb2S4] is not only a metastable phase but rather that the second product crystallizes because the Co2+ concentration in solution is too low for further formation of [Co(C6H18N4)][Sb2S4]. In the minor cases of the solvothermal reaction a very different growth was observed. At the beginning only one intense reflection occurs in the spectra and after a distinct time all other reflections start to grow simultaneously. This strange behavior indicates that disordered layers are formed at the beginning which start to arrange at later stages, yielding the three-dimensional long-range order. The in situ EXAFS experiments performed at the Sb K-edge demonstrate that, independent of the reaction time, the Sb/S ratio, and the amine applied, only the two species SbS3 and SbS4 are present in solution. © 2006 American Chemical Society.

AB - The crystal growth and kinetics of the formation of [Co(C6H 18N4)][Sb2S4] were investigated under solvothermal conditions with combined in situ EDXRD (energy dispersive X-ray diffraction) and in situ EXAFS (extended X-ray absorption fine structure) at different temperatures. In the overwhelming number of reactions all product reflections occur simultaneously in the EDXRD spectra. A detailed analysis of the extent of reaction α vs time clearly shows that the mechanism changes during the reaction. Such a change occurs at different temperatures after different reaction times. At the early stages the reactions are controlled by diffusion, and later the reaction exponents m suggest a more complex behavior. At the end of the formation of [Co(C6H18N 4)][Sb2S4] a second phase is formed which does not contain Co. The results of the in situ experiments suggest that [Co(C 6H18N4)][Sb2S4] is not only a metastable phase but rather that the second product crystallizes because the Co2+ concentration in solution is too low for further formation of [Co(C6H18N4)][Sb2S4]. In the minor cases of the solvothermal reaction a very different growth was observed. At the beginning only one intense reflection occurs in the spectra and after a distinct time all other reflections start to grow simultaneously. This strange behavior indicates that disordered layers are formed at the beginning which start to arrange at later stages, yielding the three-dimensional long-range order. The in situ EXAFS experiments performed at the Sb K-edge demonstrate that, independent of the reaction time, the Sb/S ratio, and the amine applied, only the two species SbS3 and SbS4 are present in solution. © 2006 American Chemical Society.

U2 - 10.1021/cm051788t

DO - 10.1021/cm051788t

M3 - Journal article

VL - 18

SP - 1196

EP - 1205

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 5

ER -