Research Article 
Syntheses, structural determination, and binding studies of nine-coordinate (enH2)3[Tb(III(ttha)]2•11H2O and eight- coordinate (enH2)[Tb(III((pdta)(H2O)]2•8H2O
Jun Wang, Dan Li, Jingqun Gao, Bin Liu, Baoxin Wang, Dan Wang, Tingting Fan and Xiangdong Zhang
Journal of Coordination Chemistry, 2010, 63(21), 3792-3804. DOI: 10.1080/00958972.2010.521240
Abstract
Two complexes, (enH2)3[TbIII(ttha)]2 · 11H2O (1) (en = ethylenediamine and H6ttha = triethylenetetramine-N, N, N ', N '', N ''', N '''-hexaacetic acid) and (enH2)[TbIII(pdta)(H2O)]2 · 8H2O (2) (H4pdta = propylenediamine-N, N, N ', N '-tetraacetic acid), were synthesized and characterized by elemental analysis, infrared spectrum, UV-Vis spectrum, fluorescence spectrum, and single-crystal X-ray diffraction. The central TbIII of 1 is nine-coordinate, pseudo-monocapped square antiprism with four nitrogens and five oxygens from one ttha, and crystallizing in the monoclinic crystal system with P21/n space group. There is a free (non-coordinate) carboxylate (-CH2COO-) in the [TbIII(ttha)]3-. The central TbIII of 2 is eight-coordinate in a standard square antiprism with two nitrogens and four oxygens of one pdta, one oxygen from a carboxylate of an adjacent pdta, and one oxygen from water, crystallizing in the monoclinic crystal system with C2/c space group. Binding between the enH22+ with [TbIII(ttha)]3- or [TbIII(pdta)(H2O)]- is reviewed, providing the basis for interaction of TbIII complexes with biomolecules.
ASCI-ID: 103-702
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