Cobalt(II) complexes of 1,2-(diimino-4′-antipyrinyl)ethane and 4-N-(4′-antipyrylmethylidene)aminoantipyrine
Tóm tắt
Cobalt(II) complexes of the Schiff bases 1,2-(diimino-4′-antipyrinyl)ethane (GA) and 4-N-(4′-antipyrylmethylidene)aminoantipyrine (AA) have been prepared and characterised by elemental analysis, electrical conductance in non-aqueous solvents, i.r. and electronic spectra, as well as by magnetic susceptibility measurements. The complexes have the general formulae [Co(GA)X]X (X = ClO−
4 or NO3
−), [Co(GA)X2] (X = Cl−, Br− or I−), [Co(AA)2]X2 (X = ClO4
−, NO3
−, Br− or I−) and [Co(AA)Cl2]. GA acts as a neutral tetradentate ligand, coordinating through both carbonyl oxygens and both azomethine nitrogens. In the perchlorate and nitrate complexes of GA one anion is coordinated in a bidentate fashion, whereas in the halide complexes both anions are coordinated to the metal, generating an octahedral geometry around the Co ion. AA acts as a neutral bidentate ligand, coordinating through the carbonyl oxygen derived from the aldehydic moiety and the azomethine nitrogen. Both anions remain ionic in the perchlorate, nitrate, bromide and iodide complexes of AA, whereas both anions are coordinated to the metal ion in the chloride complex, resulting tetrahedral geometry around the Co ion.
Tài liệu tham khảo
A.G. Gilman, L.S. Goodman and A. Gilman, The Pharmacological Basis of Therapeutics, Macmillan Publishing Co., New York, 1980.
C.J. Alice and C.P. Prabhakaran, Transition Met. Chem., 15, 449 (1990).
T. Radhakrishnan, P.T. Joseph and C.P. Prabhakaran, J. Inorg. Nucl. Chem., 38, 2217 (1976).
P.K. Radhakrishnan, J. Indian Chem. Soc., 61, 838 (1984).
P.K. Radhakrishnan, P. Indrasenan and C.G.R. Nair, Polyhedron, 3, 67 (1984).
S. Joseph and P.K. Radhakrishnan, Synth. React. Inorg. Met.-Org. Chem., 28, 423 (1998).
S. Joseph and P.K. Radhakrishnan, Polyhderon, in press.
A.I. Vogel, A Text Book of Quantitative Inorganic Analysis, ELBS, London, 1961.
E. Kurz, G. Kober and M. Berl, Anal. Chem., 30, 1983 (1958).
W.J. Geary, Coord. Chem. Rev., 7, 81 (1971).
R.P. Scholer and A.E. Merbach, Inorg. Chim. Acta, 15, 15 (1975).
B.J. Hathaway and A.E. Underhill, J. Chem. Soc., 3091 (1961).
B.M. Gatehouse, S.E. Livingstone and R.S. Nyholm, J. Inorg. Nucl. Chem., 8, 75 (1958).
K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds, Wiley, New York, 1986.
A.M. Donia and F.A. El-Saied, Polyhedron, 7, 2149 (1988).
H.S.B. Naik, Siddaramaiah and P.G. Ramappa, Thermochim. Acta, 287, 279 (1996).
R.M. Silverstein, G.C. Bassler and T.C. Morrill, Spectrometric Identification of Organic Compounds, J. Wiley, New York, 1991.
Liu Guofa, Na Chongw, Li Bin and Mao Kunyuan, Polyhedron, 9, 2019 (1990).
A.B.P. Lever, Inorganic Electronic Spectroscopy, 2nd edn., Elsevier, Amsterdam, 1984.
A.K. El-Sawaf, D.X. West, F.A. El-Saied and R.M. El-Bahnasawy, Synth. React. Inorg. Met.-Org. Chem., 27, 1127 (1997).
N. Saravanan, K.K.M. Yusu., P.V. Suresh and G.N. Prabhu, Synth. React. Inorg. Met.-Org. Chem., 26, 901 (1996).
S. Mayadevi and K.K.M. Yusu., Synth. React. Inorg. Met.-Org. Chem., 27, 319 (1997).
O.A. Odunola, J.A.D. Woods and K.S. Patel, Synth. React. Inorg. Met.-Org. Chem., 22, 941 (1992).