Variable pressure and temperature 19F NMR kinetic and thermodynamic study on labile paramagnetic cobalt(II) complexes

Riblet Fabrice; Novitsky Ghenadie; Helm Lothar; Scopelliti Rosario; Gulya Aurelian; Merbach Andre E.

Articolul precedent

Articolul urmator

577

SM ISO690:2012

RIBLET, Fabrice, NOVITSKY, Ghenadie, HELM, Lothar, SCOPELLITI, Rosario, GULYA, Aurelian, MERBACH, Andre E.. Variable pressure and temperature 19F NMR kinetic and thermodynamic study on labile paramagnetic cobalt(II) complexes. In: Чугаевская конференция по координационной химии, 20-24 iunie 2005, Chişinău. Chișinău, Republica Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2005, pp. 253-254.

EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core

Чугаевская конференция по координационной химии 2005

Conferința "Чугаевская конференция по координационной химии"
Chişinău, Moldova, 20-24 iunie 2005

Variable pressure and temperature 19F NMR kinetic and thermodynamic study on labile paramagnetic cobalt(II) complexes

Pag. 253-254

Riblet Fabrice¹, Novitsky Ghenadie¹², Helm Lothar¹, Scopelliti Rosario¹, Gulya Aurelian², Merbach Andre E.¹

¹ Swiss Federal Institute of Technology Lausanne,
² Moldova State University

Disponibil în IBN: 29 mai 2020

Descarcă PDF

Teza

The complexes [CoL2(R-Py)2] where HL is an asymmetric acetylacetonate
and R-Py is a γ-substituted pyridine ligand were prepared and characterized
by X-ray diffraction as {trans(N)-trans(CF3)-trans} configuration when
crystallized from non-aqueous solvents. Variable temperature 19F and 1H NMR
spectroscopy shows a dynamic equilibrium between the five possible octahedral
diastereoisomers in CD2Cl2 solution, and thermodynamic parameters were
established for the isomeric equilibria [1].

Kinetic studies were performed by NMR in order to suggest a mechanism for
the isomerisation processes. NMR spectra were recorded at variable pressures
up to 200 MPa for the establishment of reaction volume profiles using a homemade
high-pressure 19F NMR probehead.
Acknowledgments
This work has been supported by the SCOPES (Scientific Co-operation
between Eastern Europe and Switzerland) program.