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Issue 32, 2009
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Natural abundance 13C and 15N solid-state NMR analysis of paramagnetic transition-metal cyanide coordination polymers

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Abstract

The 13C and 15N MAS NMR spectra of a series of well-characterized paramagnetic metal cyanide coordination polymers are acquired at natural abundance, without the need for polarization transfer methods such as cross-polarization or INEPT. For systems where the paramagnetic centre is outside of the cyanide framework, well-resolved 13C and 15N spectra of cyanide ligands are obtained. Chemical shifts deviate from typical diamagnetic cyanide ranges and depend only partly on the cyanide coordination type, being dominated by their proximity to the paramagnetic center. A combination of the observed isotropic chemical shifts, their temperature dependence, and transverse relaxation time constants (T2) provides valuable local structural information and lays the foundation for the structural elucidation of unknown paramagnetic metal–cyanide coordination polymers. Toward this end, we apply these solid-state NMR techniques to a pair of compounds without a priori knowledge of the structures.

Graphical abstract: Natural abundance 13C and 15N solid-state NMR analysis of paramagnetic transition-metal cyanide coordination polymers

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Supplementary files

Article information


Submitted
17 Apr 2009
Accepted
29 Jun 2009
First published
21 Jul 2009

Phys. Chem. Chem. Phys., 2009,11, 6925-6934
Article type
Paper

Natural abundance 13C and 15N solid-state NMR analysis of paramagnetic transition-metal cyanide coordination polymers

P. M. Aguiar, M. J. Katz, D. B. Leznoff and S. Kroeker, Phys. Chem. Chem. Phys., 2009, 11, 6925
DOI: 10.1039/B907747B

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