Nuclear magnetic resonance studies of multinuclear chromium assemblies
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Cited by (41)
Aminopyridine complexes of Cr(III) basic carboxylates as potential polymer precursors: Synthesis, characterization, and crystal structure of [Cr<inf>3</inf>O(propionate)<inf>6</inf>(X-aminopyridine)<inf>3</inf>]<sup>+</sup> (X = 3 or 4)
2015, PolyhedronCitation Excerpt :The chromium centers in these trinuclear assemblies are antiferromagnetically coupled, resulting in a reduction of the magnetic moment per Cr(III) ion; thus, the paramagnetic shifts and broadening of the resonances should be slightly reduced in comparison to NMR spectra of mononuclear Cr(III) complexes. Additionally, as the unpaired electrons of the chromic centers are in the t2g orbitals, directed at the pi system so of the ligands and not along the sigma bonds, only π-based pathways for delocalization of the unpaired spin density from the metal ion to the ligands is expected to be significant, as observed previously for basic chromic carboxylates [13,49–51]. As shown in Table 5 and Fig. 11, the methylene and methyl hydrogens of the bridging ligands in compounds 1–3 are found at approximately +45 and −1 ppm, similar to the positions of these signals in other propionate-containing Cr basic carboxylate assemblies.
Formation of oxo-centered trinuclear chromium carboxylate complexes and hydrolysis of Cr3 as established by paramagnetic <sup>2</sup>H NMR spectroscopy
2014, Journal of Inorganic BiochemistryCitation Excerpt :Broadly applicable synthetic routes to both symmetric and unsymmetric assemblies are now available, which have resulted in a large number of complexes of this type being synthesized and well characterized [1]. The works by Vincent and coworkers have shown that NMR is an effective method for characterization of these assemblies [2–10]. Although the Cr(III) centers are paramagnetic with an expected magnetic moment of 3.87 B.M., antiferromagnetic coupling between the metals gives an average magnetic moment of circa 3.4 B.M. allowing for useful spectra to be obtained.
Paramagnetic <sup>19</sup>F NMR and electrospray ionization mass spectrometric studies of substituted pyridine complexes of chromium(III): Models for potential use of <sup>19</sup>F NMR to probe Cr(III)-nucleotide interaction
2013, PolyhedronCitation Excerpt :Thus, knowledge of the structure of the complex is often required to interpret the spectra, rather than the reverse. Yet, paramagnetic 1H, 2H, and 13C NMR have been demonstrated to be of utility in characterizing Cr(III) carboxylate assemblies [16–18]. The trinuclear oxo-centered carboxylate assemblies in this study possess the “basic carboxylate” type structure, where the three metal centers and the μ3-oxide are coplanar.
Multiple hypotheses for chromium(III) biochemistry: Why the essentiality of chromium(III) is still questioned
2007, The Nutritional Biochemistry of Chromium (III)Low-molecular-weight chromium-binding substance from chicken liver and American alligator liver
2006, Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology