Radiolysis of cobalt(III)-1,2 bis(beta-aminoethoxy)ethane N,N,N',N' sodium sulfonate triacetic acid chelate

Chelation studies of cobalt(III) with 1,2 bis(beta-aminoethoxy)ethane N,N,N',N' sodium sulfonate triacetic acid (ASTA) were performed. The results showed the effectiveness of ASTA as a chelating agent by using: molar ratio, continuous variation and slope ratio methods. Stable complex 1∶1 was formed at pH from 6.0 to 10.5. Solutions of Co-ASTA chelate of different molar ratios at pH 6.5 and 8.0 were irradiated by different gamma-radiation doses. The results showed a linear decrease of absorbance with gamma-radiation dose which can be utilized as a dosimeter for low dose rate measurement in the range studied. A proposed radiolytic mechanism is discussed. The degradation of the ASTA ligand has been related to hydroxyl radical attack.     

Note: The crystal structure of Tris(nitrato-O,O')bis(1,10-phenanthroline-N,N')terbium(III)

Our recent research interest has focussed on rare earth phenanthroline complexes, which are obviously of significant value for modern coordination chemistry. As a continuing part of a systematic investigation of ternary rare earth phenanthroline nitrato complexes [Y.Q. Zheng, L.-X. Zhou, J.L. Lin and S.-W. Zhang (2000). Z. Anorg. Allg. Chem., 626, 1715 [1]; Y.Q. Zheng, L.-X. Zhou, J.L. Lin and S.-W. Zhang (2001). Z. Anorg. Allg. Chem., 627, 1643 [2]; Y.Q. Zheng, L.-X. Zhou, J.L. Lin and S.-W. Zhang (2001). Z. Kristallogr. NCS, 216, 357 [3]; Y.Q. Zheng, L.-X. Zhou, J.L. Lin and S.-W. Zhang (2001). Z. Anorg. Allg. Chem., 627, 2425 [4]], we report the synthesis and crystal structure of tris(nitrato-O,O')bis(1,10-phenanthroline-N,N')terbium(III), Tb(phen)₂(NO₃)₃.     

B-Halogen derivatives of the bis(1,2-dicarbollyl)cobalt(III) anion

The halogenation of (C₂B₉H₁₁)₂Co^?Cs⁺ by elemental halogens in alcohol and γ-radiation-induced halogenation by CHBr₃, CH