Summary
A series of mixed-ligand complexes of group VIII metals, M(DIAFO)2(NCS)2 and M(DIAFH)2X2 (M = FeII, CoII, NiII, X = NCS−, Cl−) with the 3,3′-bridged derivative of 2,2′-bipyridyl (bipy) (1) were prepared, where DIAFO (2) and DIAFH (3) are 4,5-diazafluoren-9-one and 4,5-diazafluoren-9-hydrazone, respectively. These complexes were investigated by i.r., u.v.-vis-near i.r. spectroscopy and by variable-temperature magnetic susceptibility measurements. The electronic spectra show that the two ligands exert a field strength far removed from the FeII cross-over value. All the complexes are paramagnetic, following the Curie-Weiss law in the 77–300 K range. A typical crystal structure of Co(DIAFO)2(NCS)2 for these compounds was determined with orthorhombic, space group Pcan, a = 10.377(5) Å, b = 13.289(6) Å, c= 16.629(7) Å, V = 2293(2) Å3, D c = 1.563 g cm−3, F(000) = 1091.74, Z = 4, R = 0.043, R ∝= 0.047. Steric effects are thought to be operative in both ligands studied, but are weaker than those of the typical bidentate diimine ligand bipy.
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References
P. Gütlich and A. Hauser, Pure and Appl. Chem., 61, 891 (1989); and references therein.
D. Onggo and H. A. Goodwin, Aust. J. Chem., 44, 1539 (1991); and references therein.
J. Henderson Jr, F. R. Fronzek and W. R. Eherry, J. Am. Chem. Soc., 106, 5976 (1984).
J. Mlochowski and Z. Szule, Pol. J. Chem., 57, 134 (1983).
D. Onggo, A. David Rae and H. A. Goodwin, Inorg. Chim. Acta, 178, 151 (1990).
A. B. P. Lever. Inorganic Electronic Spectroscopy, Amsterdam, Elsevier, 1984.
C. K. Jørgensen, Absorption Spectra and Chemical Bonding Complexes, Pergamon Press, New York, 1962.
H. L. Schlafer and G. Gliemann, Basic Principles of Ligand Field Theory, Interscience, New York, 1969.
E. Konig and K. J. Waston, Chem. Phys. Lett., 6, 457 (1970).
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Xiao-Hui, S., Xiao-Zeng, Y., Cun, L. et al. Synthesis, spectral and magnetic studies on mixed-ligand complexes M(DIAFO)2(NCS)2 and M(DIAFH)2X2 (M = FeII, CoII, NiII). The crystal structure of Co(DIAFO)2(NCS)2 . Transition Met Chem 20, 191–195 (1995). https://doi.org/10.1007/BF00167028
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DOI: https://doi.org/10.1007/BF00167028