| Effects of structures of HgX(2) complexes (X = CF(3)SO(3) and Cl) with chiral bidentate ligands on circular dichroism spectra. | |
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MedLine Citation:
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PMID: 23280359 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The effects of the structures of HgX(2) complexes (X = CF(3)SO(3) and Cl) with chiral bidentate ligands [(R)-(-)-1-(1-naphthyl)-N,N-bis(pyridin-4-ylmethyl)ethanamine, (R)-(+)-1-phenyl-N,N-bis(pyridin-4-ylmethyl)ethanamine, (R)-(-)-1-(1-naphthyl)-N,N-bis(pyridin-3-ylmethyl)ethanamine, and (R)-(+)-1-phenyl-N,N-bis(pyridin-4-ylmethyl)ethanamine] on circular dichroism (CD) spectra are reported. The CD spectra of free (R)-(-)- and (R)-(+)-, which have 4-pyridyl groups, are similar to those of (R)-(-)- and (R)-(+)-, which have 3-pyridyl groups. When equimolar amounts of Hg(CF(3)SO(3))(2) are added to these ligands, a decrease in the CD intensity of (R)-(-)- is observed, and significant spectral changes (intensity and shape) are observed in (R)-(-)-, (R)-(+)-, and (R)-(+)-. X-ray crystal structures suggest that the (R)-(-)-/Hg(CF(3)SO(3))(2) complex is a coordination polymer with no bridging CF(3)SO(3) anions, whereas the (R)-(-)-/Hg(CF(3)SO(3))(2) and (R)-(+)-/Hg(CF(3)SO(3))(2) complexes are coordination polymers with CF(3)SO(3) anion bridges, and the (R)-(+)-/Hg(CF(3)SO(3))(2) complex has a tricyclic structure bridged by CF(3)SO(3) anions. Two different conformers, which have clockwise and counter-clockwise screw senses between the naphthalene axis and the pyridine axis, are observed in the ligand components of the (R)-(-)-/Hg(CF(3)SO(3))(2) complex. In contrast, the X-ray structures of the (R)-(-)-/HgCl(2) and (R)-(+)-/HgCl(2) complexes are one-dimensional coordination polymers without bridging Cl anions. The significant CD spectral changes in the HgX(2) complexes with different chiral bidentate ligands require formation of rigid structures and a single-directional screw sense between chromophores. |
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Authors:
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Mari Ikeda; Shunsuke Kuwahara; Shim Sung Lee; Yoichi Habata |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-2 |
Journal Detail:
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Title: Dalton transactions (Cambridge, England : 2003) Volume: - ISSN: 1477-9234 ISO Abbreviation: Dalton Trans Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-2 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101176026 Medline TA: Dalton Trans Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan. habata@chem.sci.toho-u.ac.jp. |
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