Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1308488 | Inorganica Chimica Acta | 2009 | 8 Pages |
Abstract
Two dinuclear spin-coupled divalent cobalt complexes, [Co2(P1-Oâ)(μ2-OAcâ)](ClO4)2, (1) and [Co2 (P1-Oâ)(μ2-BNPPâ)](ClO4)2, (2) containing μ-1,3 acetate (OAcâ) and bis(4-nitrophenyl)phosphate (BNPPâ) auxiliary bridges, respectively, were synthesized. They were characterized by single crystal X-ray diffraction, to show a trigonal bipyramidal geometry around each cobalt center and the intervening bridging atoms that are responsible for spin-transfer between the two divalent cobalt centers; the alkoxo oxygen donor occupies an equatorial position, and the auxiliary ligand oxygens (OAcâ/BNPPâ) occupy the axial positions. Solution state magnetic moment measurement together with UV-Vis/NIR spectra revealed a high-spin ground state (S = 3/2) for Co(II) in these compounds. Complexes 1 and 2 show interesting 1H NMR spectral features of resonances with relatively narrower linewidths in conjunction with a sizable chemical shift dispersion of â5 and 265 ppm.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Inorganic Chemistry
Authors
Gnana S. Siluvai, Narasimha N. Murthy,