Abstract
Compounds [Cr III3 (μ3-O)(O2CPh)5(H2N-sao)(EtOH)2]·EtOH (1·EtOH) and [Cr III3 (μ3-O)(O2CPh)3(H2N-pao)3]NO3·H2N-paoH·EtOH (2·NO3·H2N-paoH·EtOH) have been obtained either in a sequential one-pot, two-step procedure in which Cr(NO3)3·9H2O is first reacted with sodium benzoate in ethanol under reflux, followed by the addition of salicylamidoxime (H2N-saoH2) or pyridine-2-amidoxime (H2N-paoH), or in a one-step protocol starting from [Cr III3 (μ3-O)(O2CPh)6(EtOH)3]NO3. They were characterized by single-crystal X-ray diffraction, magnetometry and EPR spectroscopy. Complexes 1 and 2 are derived from the parent complex [Cr III3 (μ3-O)(O2CPh)6(EtOH)3]+ by replacement of one and three benzoate ligands, respectively, by oximate ligands. The salicylamidoximate and pyridine-2-amidoximate ligands display a tridentate coordination mode with the N–O oximate group bridging a pair of Cr atoms and the additional ligating atom substituting for an ethanol ligand of the parent complex. In both cases susceptibility, magnetization and EPR data reveal a S T = 1/2 ground state with a nearly isotropic g-tensor.
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Acknowledgments
We thank Lise-Marie Chamoreau for her help in the preparation of some figures. ART acknowledges the Université Pierre et Marie Curie for a post-doctoral grant. We also acknowledge support from the Centre National de la Recherche Scientifique. We are also thankful to the RENARD network, more specifically to Prof. D. Gourier and Dr. L. Binet from Chimie ParisTech (UMR 7574, CNRS - UPMC, Paris 6), for access to the EPR spectrometer and useful discussions.
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Dedicated in memory of our friends and colleagues Roland Contant and Louis Nadjo.
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Tomsa, AR., Li, Y., Blanchard, S. et al. Oxo-Centered Trinuclear Chromium(III) Complexes with Both Carboxylate and Amidoximate Ligands. J Clust Sci 25, 825–838 (2014). https://doi.org/10.1007/s10876-013-0669-x
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DOI: https://doi.org/10.1007/s10876-013-0669-x