Abstract
A series of cis and trans octahedral cobalt(III) complexes of the general formula [Co(3,2,3-tet)XY] +/3+ have been synthesized, together with some other new members, where XY = Cl 2, Br 2, (NO 2) 2, (N 3) 2, (CN) 2, (OCN) 2, (SCN) 2, (NH 3) 2, (NO 2)Cl, (NO 2)Br, (NO 2)SCN), (CH 3COO) 2, (C 6H 5COO) 2, CO 3 2−, C 2O 4 2− and en. The spectroscopic properties of these complexes are recorded. The IR and UV-vis spectra were employed to characterize the synthesized complexes and to confirm the cis-geometry for the carbonato, oxalato and ethylenediamine series, and the trans-geometry for the rest. In general the IR spectra for the CH 2 rocking in the 800-910 cm −1 region exhibit four weak absorption bands for the cis complexes and only two or three more intense bands for the trans complexes. The average ligand field strength Dq av for a number of quadridentate amines increases in the order; trpn < cyclen < 3,2,3-tet ∼ 2,2,3-tet < 2,3,2-tet < tren ≤ 2,2,2-tet.
Published Version
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